Troubleshooting

General Troubleshooting Information

SMCS Code: 5741-035

The diagnostics for the Autodig ECM can be accessed through the Caterpillar Monitoring System or the Caterpillar Electronic Technician (ET). Troubleshooting the Autodig system requires additional information from the machine's Service Manual. The additional manuals that may be required are the Service Manual, the Electrical Schematic, the Electrical Schematic Supplement, the Parts Manual and the Operation and Maintenance Manual for the machine that is being serviced.

As a guide, a typical system schematic is included at the end of this module. For an accurate representation of the machine that is being diagnosed, refer to Electrical System Schematic in the Service Manual for the machine that is being serviced.

When the troubleshooting procedure instructs you to "REPAIR THE HARNESS", use the Electrical System Schematic for the machine that is being serviced to trace the circuit. Perform continuity checks at the harness connectors of the components, always check the ground circuit. Less than five ohms of resistance is required between the ground contacts of the connector and the frame ground. Excessive ground resistance that is greater than five ohms can cause incorrect diagnosing of problems.

During troubleshooting, inspect all connections before any component is replaced. If these connections are not clean and tight, permanent electrical problems or intermittent electrical problems can result. Check that the wires are pushed into the connectors completely. Make sure that the connections are tight before other tests are made.

Failure of an electrical component can cause the failure of other components. Also, failure of electrical components can be caused by the failure of other components. Always attempt to correct the cause of an electrical system failure before you replace a component.

NOTE: Before any tests are made to the Autodig system, operate the machine manually. Check the machine systems for correct operation. If any problems occur on manual operation, refer to the relevant machine systems section of the machine Service Manual for troubleshooting information.

Service Tools

SMCS Code: 0785; 5741

The following service tools should be used to aid in troubleshooting the electrical system.

Reference: For instructions on servicing Sure Seal connectors, refer to Special Instruction, SMHS7531. For instructions on servicing the Deutsch DT Type connectors, refer to Special Instruction, SEHS9615.

Use the digital multimeter for making continuity checks or for measuring voltage. For instructions about the use of the 6V-7070 Digital Multimeter, refer to Special Instruction, SEHS7734. The 7X-1710 Multimeter Probe Group is used for measuring the voltage at connectors without needing to disconnect the connectors. The probe cables are pushed into the back of the connector along the wire. The 8T-8726 Adapter Cable has a three pin breakout. The adapter cable is used for measurements in the sensor circuits.

NOTE: Except for harness tests, using continuity testers such as the 8T-0500 Continuity Tester or voltage tester such as the 5P-7277 Voltage Tester are not recommended for today's Caterpillar electrical circuits.

4C-8195 Control Service Tool

4C-8195 Control Service Tool

(1) Mode switch.

(2) Clear switch.

(3) Scroll switch.

The 4C-8195 Control Service Tool is helpful for the service person to make the proper electrical connections at the Caterpillar Monitoring System service connector during troubleshooting. Three connectors are wired in parallel so that the service tool is usable on the different types of machine harnesses.

Actuating the mode switch scrolls through the display modes of the Caterpillar Monitoring System. Actuating the scroll switch, scrolls the display while in the service or numeric readout mode. Actuating the clear switch when in service mode, clears the fault being continuously shown. Actuating the clear switch when in tattle tale mode, clears all extreme values.

Electrical Component and Connector Locations

SMCS Code: 1408-546-CY; 5741-035

The Electrical Schematic, Parts Manual, Operation and Maintenance Manual for the machine being serviced, should be used to locate electrical components and connectors.

Location of Components

(1) Service port (Electronic Technician).

(2) Connection port (service tool).

Connector Contact Numbers

SMCS Code: 1408-546-CY; 5471-035

Autodig Electronic Control Module (ECM)

Autodig Electronic Control Module (ECM)

(1) Connector J1.

(2) Connector J2.

Autodig Electronic Control Module Harness Connectors

(3) Screw.

To remove the machine harness from the control, use screw (3) in the center of the harness connector.

Service Connector

Caterpillar Monitoring System

Service Tool Connection Port with Jumpers - Typical Example

Switches

For all switch diagnostics, refer to the switch continuity charts below to determine correct continuity readings.

O Open (no continuity),

G Grounded (continuity to ground),

B Battery (continuity to + battery),

N/O Normally Open,

N/C Normally Closed,

M Momentary Contact.

Sensors

Solenoids

Using Caterpillar Monitoring System to Determine Service Codes

SMCS Code: 5741-035; 7490-035

Display Area of Caterpillar Monitoring System
The display area is showing service code: MID No. 082, CID No. 0350, FMI No. 03

(1) First display.

(2) Second display.

(3) Module identifier (MID).

(4) Service code indicator (SERV CODE).

(5) Component identifier (CID).

(6) Failure mode identifier (FMI).

Use the following procedure to troubleshoot the service code information.

1. Place the Caterpillar Monitoring System in service mode (mode 3). To do so, ground the service and clear contacts of the service connector. Remove ground when the mode number "-3-" (for service mode) is shown on the display.

NOTE: Diagnostic scrolling mode may be entered to see the service codes, but the service codes can be more easily diagnosed using service mode. Service mode allows service codes to be placed on-hold for further investigation and to be cleared when the problem has been fixed.

2. A service code is shown and on-hold at this time. The display toggles between showing MID (3) and CID (5), FMI (6). When there are no service codes (while in service mode), screen (1) shows "---" only.

3. To see all the service codes, scroll the service codes. To do so, ground the service contact of the service connector. The display momentarily shows MID (3) then CID (5), FMI (6) for each service code. The word "End" is shown after the last service code in the list.

4. Place the desired service code on-hold (stop the scrolling). To do so, remove ground from the service contact of the service connector when the desired service code is shown.

5. Use the MID information to determine which electronic control system is generating the service code. If the MID is not "082", refer to the Electrical Schematic Supplement of the machine that is being serviced to determine which electronic control module detected the fault. Then refer to the service manual module for that electronic control module. If the MID is "082" (Autodig ECM), use this Systems Operation, Testing and Adjusting to troubleshoot the fault that generated the service code.

6. Observe service code indicator (4). In service mode the service code indicator functions as a fault present indicator.

* If fault present indicator (4) shows "SERV CODE", then the fault that caused the service code shown is currently present.

* If fault present indicator (4) is OFF, then the fault that caused the service code shown is not present at this time. The fault has occurred and then went away, sometime in the past (intermittent).

7. To troubleshoot the service code, refer to the Systems Operation, Testing and Adjusting, "Troubleshooting Procedures" and use the procedure with the same CID and FMI. Use the service manual for the electronic control module that is generating the service code (see Step 5).

8. After a service code is corrected and it is no longer needed, clear the service code. To do so, momentarily ground the clear contact of the service connector while the fault is on-hold. After clearing, the display advances to the next available service code.

9. Repeat Steps 2 through 8 for the remaining service codes. Return to normal mode when finished. To do so, ground the service and clear contacts of the service connector. Remove ground when the mode number "-0-" (for normal mode) is shown on the display.

Using Caterpillar Electronic Technician (ET) to Determine Service Codes

SMCS Code: 0785; 5741-035

Connections for the Caterpillar Electronic Technician (ET)
The following components are needed to use CAT ET:

(1) Current version of Caterpillar Electronic Technician software and an IBM compatible personal computer.

(2) Service Diagnostic Cable.

(3) 171-4400 Communication Adapter II Group and software. See Special Publication, NEHS0758, "Communications Adapter II User's Manual Contains Software".

(4) Cable.

NOTE: Caterpillar Electronic Technician (ET) is a software program that can be used on an IBM compatible personal computer.

Reference: In order to use the CAT ET, order the following materials: Special Publication, JERD2124, "ET Single Use Program License", Special Publication, JEHP1026, "Information and Requirements Sheet", and 7X-1425 Data Link Cable. The Special Publication, JEHP1026, "Information and Requirements Sheet" lists the required hardware and the features of CAT ET.

NOTE: The service tool (ET) is not needed to determine or clear service codes. However, the process of determining service codes is easier and faster with the CAT ET. The ET can also display status information of certain system parameters like: Lift linkage and tilt linkage position sensor angles. This feature along with the ability to display service code history information, make ET a useful troubleshooting tool.

The ET connects to the machine service tool connector and communicates with the electronic control modules over the data link. For information on the location of service connectors, refer to the Operation and Maintenance Manual and the Electrical Schematic for the machine that is being serviced.

To use the ET service tool, choose the "Machine Functions" option from the main menu. The next menu is a list of the Electronic Control Modules (ECM) installed on the machine. Choose the Menu item "Autodig" for information on this control. After determining the service codes with CAT ET, refer to Systems Operation, Testing and Adjusting, "Troubleshooting Procedures" to troubleshoot active service codes.

NOTE: If you need guidance in the use of CAT ET, you can use the "HELP" function. This function will help you through every task that can be performed by CAT ET.

Troubleshooting Faults with Service Codes

SMCS Code: 0785; 5741-035

Use the Caterpillar Electronic Technician (ET) to determine the Autodig ECM system service codes. After determining the service codes, go to the procedure, under the subject Procedures that follows. Perform the procedure that corresponds to the service code (CID and FMI) determined. The following is a list of possible service codes for the Autodig ECM.

NOTE: The preceding table of service codes and this module apply only to the Autodig system service codes. When the Caterpillar Monitoring System is in service mode, service codes for the Autodig ECM are shown on the Caterpillar Monitoring System display area.

The service code information for the Autodig ECM is transferred via the CAT data link to the Caterpillar Monitoring System. This diagnostic information is shown when the Caterpillar Monitoring System is in service mode.

The module identifier (MID) tells service personnel which electronic control module is sending the service code. The MID code for the Autodig ECM system is "082". This module applies only to service codes with a MID of "082". The MID code of other electronic control modules on a particular machine (Caterpillar Monitoring System, electronic engine, etc.) can be found on the Electrical Schematic. Troubleshooting information for those service codes (MID is not "082"), can be found in the service manual for that system.

Troubleshooting Faults without Service Codes

SMCS Code: 0785; 5741-035

Autodig Horn Malfunction

The Autodig horn is an output of the Autodig ECM. The Autodig horn sounds once to alert the operator that the machine has contacted the stockpile and an Autodig loading cycle has commenced. The Autodig horn will sound once when the Autodig cycle has been completed.

Autodig Horn Always ON

If the Autodig Horn is always ON, the harness circuit shorted to +battery or the Autodig ECM is faulty.

1. Check for a shorted harness.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect both the machine harness connectors from the Autodig ECM.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. At the machine harness connector for the Autodig ECM, measure the voltage between the contacts J2-44 (signal) and J2-69 (ground).

Expected Result: The voltage reading should be approximately 0 DCV.

Results:

* OK - Voltage is approximately 0 DCV. Proceed to Step 2.

* NOT OK - Voltage is approximately battery voltage; there is a short circuit to +battery in the machine harness between the Autodig ECM and the horn. Repair or replace the machine harness. STOP.

2. Check if the fault remains.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Inspect, clean and reconnect all related harness connectors.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. Enter service mode on the Caterpillar Monitoring System.

e. Operate the machine, check to see if the same fault is present.

Expected Result: The fault should not be present.

Results:

* OK - Fault is NOT present. The initial fault was probably caused by a poor electrical connection at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation. STOP.

* NOT OK - Fault is present. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

Autodig Horn Always OFF

If the Autodig horn is always OFF; the Autodig horn is faulty, the machine harness circuit is open, the harness circuit is shorted to ground, or the Autodig ECM is faulty.

1. Check the Autodig Horn.

a. Disconnect the Autodig horn from the machine harness.

b. Use jumper wires to connect the respective terminals of the Autodig horn to +battery and ground.

c. Check to see if the horn sounds when power is applied.

Expected Results: The Autodig horn sounds.

Results:

* OK - The Autodig horn sounds. Proceed to Step 2.

* NOT OK - The Autodig horn does NOT sound. Replace the Autodig horn. STOP.

2. Check for a shorted harness.

a. The Autodig horn remains disconnected.

b. Turn the engine start switch and the battery disconnect switch to the OFF position.

c. Disconnect the machine harness connector J2 from the Autodig ECM.

d. At the machine harness connector for the Autodig ECM, measure the resistance between contact J2-44 (wire H823-GY) and contact J2-69 (ground).

Expected Results: The resistance should be greater than 5000 ohms.

* OK - Resistance is greater than 5000 ohms. Proceed to Step 3.

* NOT OK - Resistance is less than 5000 ohms. Wire H823-GY is shorted to ground in the machine harness. Repair or replace the machine harness. STOP.

3. Check for an open harness.

a. The engine start switch and the battery disconnect switch remains in the OFF position.

b. The Autodig horn and the Autodig ECM remain disconnected from the machine harness.

c. Measure the resistance between the control harness contact (J2-44) and the Autodig horn harness terminal of wire H823-GY

* OK - Resistance is less than 5000 ohms (continuity). It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - Resistance is greater than 5000 ohms (no continuity). Wire H823-GY is open in the machine harness between the Autodig ECM and the Autodig horn. Repair or replace the machine harness. STOP.

Troubleshooting Procedures

SMCS Code: 5741-035

Refer to the procedure that corresponds to the service code (CID and FMI) that is displayed on the CAT Electronic Technician or the Caterpillar Monitoring System.

NOTE: The following procedures may cause some new faults to be logged. Therefore, record all service codes before you perform any procedures. As each procedure is completed, clear the service codes that were caused by the procedure.

CID 190 Procedure (Engine Speed Sensor) CID 191 Procedure (Transmission Output Speed Sensor) CID 672 Procedure (Torque Converter Output Speed Sensor)

SMCS Code: 1907-038; 3141-038; 3175-038; 5741-038

FMI 08

This service code is recorded when the ECM reads the engine (CID 190), transmission output (CID 191), or torque converter output (CID 672) speed signal as having an abnormal frequency (FMI 08) i.e. engine speed greater than 2400 RPM. The engine, transmission and torque converter output speed sensors are frequency sensors.

NOTE: Ensure that the CID/FMI 08 service code is on-hold and that the fault present indicator shows "SERV CODE".

1. Check for a shorted sensor.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the machine harness from the speed sensor.

c. At the sensor, measure the resistance between each connector contact and the case of the sensor.

Expected Result: The resistance of either measurement is greater than 10 000 ohms.

Results:

* OK - Resistance of either measurement is greater than 10 000 ohms; the speed sensor is not shorted to the case. Proceed to Step 2.

* NOT OK - Resistance of either measurement is less than 10 000 ohms; the speed sensor is faulty. Replace the sensor. Adjust the speed sensor properly when installing it. STOP.

Reference: For the procedure to adjust the speed sensor, refer to Systems Operation, Testing and Adjusting, "Speed Sensor - Adjust" for the machine that is being serviced.

2. Check the sensor resistance.

a. The engine start switch and the battery disconnect switch remain in the OFF position and the speed sensor remains disconnected from the machine harness.

b. At the sensor, measure the resistance between the two contacts of the sensor connector.

Expected Result: The resistance should be between the specifications in the Speed Sensor table.

Results:

* OK - Resistance is between specifications in the Speed Sensor table. Proceed to Step 3.

* NOT OK - Resistance is NOT between specifications. Replace the sensor. Adjust the speed sensor properly when installing it. STOP.

Reference: For the procedure to adjust the speed sensor, refer to Systems Operation, Testing and Adjusting, "Speed Sensor - Adjust" for the machine that is being serviced.

3. Check for an open harness.

a. The engine start switch and the battery disconnect switch remain in the OFF position.

b. Reconnect the speed sensor to the machine harness.

c. Disconnect machine harness J1 from the ECM.

d. Measure the resistance between the connector contacts for the desired sensor. Refer to the Speed Sensor Contact Description table for connector contacts.

Expected Result: The resistance matches the value measured in Step 2.

Results:

* OK - Resistance matches the value measured in Step 2. Proceed to Step 4.

* NOT OK - Resistance does NOT match the value measured in Step 2. The machine has an open circuit. Repair or replace the harness. STOP.

4. Check for a shorted harness.

The engine start switch and the battery disconnect switch remain in the OFF position.

a. Disconnect the speed sensor from the machine harness.

b. Disconnect the machine harness J1 and J2 from the Autodig ECM.

c. At the machine harness connector for the Autodig ECM, measure the resistance between the signal contact for the desired sensor and all other connector contacts.

d. Repeat Step 4c for the return wire for the desired sensor.

Reference: Refer to Systems Operation, Testing and Adjusting, "Connector Contact Numbers" for the Speed Sensor Connector Contacts table to determine the sensor contacts.

Expected Result: Each resistance should be greater than 5000 ohms.

Results:

* OK - Resistance is greater than 5000 ohms. Proceed to Step 5.

* NOT OK - Resistance is less than 5000 ohms. The sensor wire is shorted within the machine harness between the speed sensor and the ECM. Repair or replace the machine harness. STOP.

5. Recheck the fault.

a. Reconnect all machine harness connectors.

b. Turn the engine start switch and the battery disconnect switch to the ON position.

c. Start the engine and move the machine.

d. Put the respective FMI 08 fault on-hold.

e. Observe the ON/OFF status of the fault present indicator.

Expected Result: The fault present indicator is OFF.

Results:

* OK - Fault present indicator is OFF. A machine harness connection was faulty. The fault is not present now. An intermittent connection exists in the speed sensor circuit of the machine harness. Watch for a recurrence of this fault. STOP.

* NOT OK - Fault present indicator is ON. The fault remains present. Proceed to Step 6.

6. Check the speed sensor adjustment.

a. Check the speed sensor adjustment.

Reference: For the procedure to adjust the speed sensor, refer to Systems Operation, Testing and Adjusting, "Speed Sensor - Adjust" for the machine that is being serviced.

b. Recheck the fault. Perform the instructions for Step 4.

c. Observe the ON/OFF status of the fault present indicator.

Expected Result: The fault present indicator is OFF.

Results:

* OK - Fault present indicator is OFF. Adjustment of the speed sensor corrected the fault. STOP.

* NOT OK - Fault present indicator is ON. Continue with this step.

d. Replace the speed sensor and check if the fault is corrected. If the fault remains, it is unlikely that the Autodig ECM is the cause.

e. Perform Steps 1 through 4 again.

f. Recheck to see if the fault present indicator is ON for this fault. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

CID 350 Procedure (Lift Linkage Position Sensor) CID 351 Procedure (Tilt Linkage Position Sensor)

SMCS Code: 5736-038-LQ; 5736-038-T2; 5741-038

FMI 03

This fault is recorded when the Autodig ECM senses an open circuit or a short to +battery in the lift linkage position sensor (CID 350) circuit, or an open circuit or a short to +battery in the tilt linkage position sensor (CID 351) circuit. Both position sensors are PWM type sensors.

1. Check the harness ground circuit.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the position sensor at the machine harness connector.

c. At the machine harness connector for the position sensor, measure the resistance from contact B (ground) to frame ground.

Expected Result: The resistance should be 2 ohms or less.

Results:

* OK - The resistance is 2 ohms or less. The machine harness is correct. Proceed to Step 2.

* NOT OK - The resistance is NOT 2 ohms or less. The machine harness is faulty. Repair or replace the machine harness. STOP.

NOTE: The following step can create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

2. Check the harness signal circuit.

a. Turn the engine start switch and the battery disconnect switch to the ON position.

b. Disconnect the machine harness connector from the sensor.

c. At the machine harness connector for the sensor, measure the voltage between contact C (signal) and contact B (ground).

Expected Result: The voltage should measure approximately 5 DCV.

Results:

* OK - The voltage is approximately 5 DCV. The voltage is correct. Replace the sensor. STOP.

* NOT OK - The voltage is NOT approximately 5 DCV. The voltage is NOT correct. Proceed to Step 3.

3. Check for an open signal circuit.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. The sensor remains disconnected from the machine harness.

c. Disconnect the machine harness from the Autodig ECM.

d. Place a jumper wire between contact C (signal) and contact B (ground) of the machine harness connector for the sensor.

e. At the machine harness connector of the Autodig ECM, measure the resistance between the signal contact and frame ground.

Reference: Refer to Systems Operation, Testing and Adjusting, Sensor Connector Contacts table.

Expected Result: The resistance measures less than 10 ohms.

Results:

* OK - The resistance measures less than 10 ohms. The circuit is correct. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - The resistance is NOT less than 10 ohms. The circuit is open. Repair or replace the machine harness. STOP.

FMI 04

This fault code is recorded when the Autodig ECM registers a short circuit to ground in the lift linkage position sensor signal wire (CID 350), or a short circuit to ground in the tilt linkage position sensor signal wire (CID 351). Both position sensors are PWM type sensors.

1. Check the signal wire for shorts.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the position sensor from the machine harness.

c. Disconnect the machine harness from the Autodig ECM.

d. At the machine harness connector for the Autodig ECM, measure the resistance of the position sensor signal wire to frame ground.

Expected Result: The resistance is greater than 5000 ohms.

Results:

* OK - Resistance is greater than 5000 ohms. The machine harness is correct. Proceed to Step 2.

* NOT OK - Resistance is NOT greater than 5000 ohms. The machine harness is faulty. Check the machine harness connectors, ensure they are clean and tight. Repair or replace the machine harness and/or connectors. STOP.

NOTE: The following steps can create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

2. Check for +battery at the sensor.

a. Reconnect the machine harness connector for the Autodig ECM.

b. Reconnect the machine harness connector for the position sensor.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. Using 7X-1710 cable probes, backprobe the machine harness connector for the position sensor, measure the voltage between contacts A (+battery) and B (ground).

Expected Result: The voltage should be approximately 24 DCV.

Results:

* OK - The voltage is approximately 24 DCV. Proceed to Step 3.

* NOT OK - The voltage is NOT approximately 24 DCV. The machine harness is faulty. Check all machine harness connectors, ensure they are clean and tight. Repair or replace the machine harness and/or connectors. STOP.

3. Check the position sensor.

a. The engine start switch and the battery disconnect switch remain in the ON position.

b. The position sensor remains connected to the machine harness.

c. Ensure that the CID 350/FMI 04 or CID 351/FMI 04 is on-hold and the fault present indicator is on.

d. Disconnect the position sensor from the machine harness.

e. Check to see if the fault present indicator is ON or OFF.

NOTE: The Caterpillar Monitoring System can take up to 30 seconds before updating the display area.

Expected Result: The fault present indicator turns OFF.

Results:

* OK - The fault present indicator turns OFF. The position sensor is faulty. Replace the sensor. Refer to Systems Operation, Testing and Adjusting, "Position Sensor (Lift Linkage) - Adjust" or "Position Sensor (Tilt Linkage) - Adjust" for the machine that is being serviced. STOP.

* NOT OK - The fault present indicator remains ON. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

FMI 08

This fault is recorded when the Autodig ECM senses the lift linkage position sensor (CID 350), or tilt linkage position sensor (CID 351) as having an abnormal frequency, pulse width or period. Both position sensors are PWM type sensors.

1. Check the harness ground circuit.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the position sensor at the machine harness connector.

c. At the machine harness connector for the position sensor, measure the resistance from contact B (ground) to frame ground.

Expected Result: The resistance should be 2 ohms or less.

Results:

* OK - The resistance is 2 ohms or less. The machine harness is correct. Proceed to Step 2.

* NOT OK - The resistance is NOT 2 ohms or less. The machine harness is faulty. Repair or replace the machine harness. STOP.

2. Check the machine harness and connectors.

a. The engine start switch and the battery disconnect switch remain in the OFF position.

b. Inspect the machine harness for chafing and/or damage. Inspect and clean all connectors related to the position sensor in the machine harness. All connectors should be clean and tight.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. Check to see if the fault is still active.

Expected Result: The fault is no longer active.

Results:

* OK - The fault is no longer active. There was a loose or dirty machine harness connector. Clear the logged fault. STOP.

* NOT OK - The fault is still active. Proceed to Step 3.

3. Check sensor.

a. Connect Electronic Technician (ET) to machine and enter the status mode for the Autodig ECM.

b. Select lift linkage position sensor or tilt linkage position sensor to display status.

c. Start the machine and cycle the bucket/lift arms through slowly and observe the status screen. Check for any sudden changes in lift/tilt linkage position.

Expected Results: The lift/tilt position changes erratically.

Results:

* OK - The lift/tilt position change erratically. The position sensor is faulty. Replace the position sensor and recheck. STOP.

* NOT OK - The lift/tilt position sensor does NOT change erratically. The position sensor is functioning correctly. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

FMI 13

This fault is recorded when the Autodig ECM registers that the lift linkage position sensor (CID 350) or the tilt linkage position sensor (CID 351) requires calibration. This fault can become active due to:

* Replacement of the Autodig electronic control module.

* Installation of new Autodig system software.

* Lift or tilt linkage position sensor is replaced.

1. Perform calibration.

a. Connect Electronic Technician (ET) and perform the calibration procedure. Refer to Systems Operation, Testing and Adjusting, "Position Sensor (Lift Linkage and Tilt Linkage) - Calibrate" for the machine that is being serviced.

Expected Result: The fault is no longer active.

Results:

* OK - The fault is no longer active. Resume normal operation. STOP.

* NOT OK - The fault is still active. Check the sensor adjustment, refer to Systems Operation, Testing and Adjusting, "Position Sensor (Lift Linkage) - Adjust" or "Position Sensor (Tilt Linkage) - Adjust" for the machine that is being serviced, and perform these steps again. It is unlikely that the Autodig ECM is faulty. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

CID 354 Procedure (Lift Solenoid Control Valve) CID 355 Procedure (Lower Solenoid Control Valve) CID 356 Procedure (Dump Solenoid Control Valve) CID 357 Procedure (Tilt Back Solenoid Control Valve)

SMCS Code: 5479-038-ZM; 5741-038

FMI 03

This fault is recorded when the Autodig ECM detects that there is a short circuit to +battery in the electrical path from the solenoid back to the ECM.

If the Autodig ECM detects that this fault is active, the ECM deactivates the implement solenoid ground interrupt relay to prevent any fault related implement movement. This will log an open circuit (FMI 05) fault code for all implement solenoids.

NOTE: Before performing this procedure, use the Control Solenoid Connector Contact table to determine the connector contact that corresponds to the faulty circuit. Refer to Systems Operation, Testing and Adjusting, "Connector Contact Numbers" for the Control Solenoid Connector Contacts table.

NOTE: This procedure causes the ECM to log an open circuit diagnostic code for this solenoid. Clear this code from the ECM after troubleshooting.

1. Check the solenoid.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the solenoid with the fault from the machine harness.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. At the harness connector for the solenoid, measure the voltage from the ECM between contacts 1 and 2.

Expected Result: The voltage reading should be approximately the same as the battery voltage.

Results:

* OK - Voltage is approximately battery voltage. There is a short circuit to +battery. Proceed to Step 2.

* NOT OK - Voltage is approximately 5 DCV. Replace the solenoid. STOP.

2. Inspect the harness.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect both the machine harness connectors from the Autodig ECM.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. At the machine harness connector for the Autodig ECM, measure the voltage between contact J2-69 (ground) and the contact for the faulty solenoid circuit.

Expected Result: The voltage reading should be approximately 0 DCV.

Results:

* OK - Voltage is approximately 0 DCV. Proceed to Step 3.

* NOT OK - Voltage is approximately battery voltage; there is a short circuit to +battery in the machine harness. Repair or replace the harness. STOP.

3. Check if the fault remains.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Inspect and reconnect all harness connectors.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. Put the Caterpillar Monitoring System in service mode with the same fault on-hold.

e. Operate the machine, check to see if the fault present indicator is ON.

Expected Result: The fault should not be present.

Results:

* OK - Fault is NOT present. The initial fault was probably caused by a poor electrical connection at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation. STOP.

* NOT OK - Fault is present. It is unlikely that the Autodig ECM is faulty. Perform the previous steps again. If the cause of the fault is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

FMI 05

This fault is recorded when the Autodig ECM detects that there is not a complete electrical path from the ECM to the solenoid to ground (open circuit).

NOTE: Before performing this procedure, use the Control Solenoid Connector Contact table to determine the connector contacts that corresponds to the faulty circuit. Refer to Systems Operation, Testing and Adjusting, "Connector Contact Numbers" for the Control Solenoid Connector Contacts table.

NOTE: If all implement solenoid control valve fault codes become active at once (CID's 354, 355, 356 and 357), be sure to check that the implement solenoid ground interrupt relay is functioning correctly before proceeding with this procedure.

NOTE: The following steps may create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

1. Check for an open circuit harness.

a. Turn the engine start switch and the battery disconnect switch to the ON position.

b. Put the Caterpillar Monitoring System in service mode with the same fault on-hold.

c. Ensure that the fault present indicator is ON.

d. Disconnect the solenoid valve from the machine harness.

e. Observe the ON/OFF status of the fault present indicator.

f. At the machine harness connector for the solenoid valve, place a jumper wire from contact 1 to contact 2.

Expected Result: The fault present indicator should remain ON.

Results:

* OK - Fault present indicator remains ON. The machine harness or Autodig ECM is faulty. Proceed to Step 2.

* NOT OK - Fault present indicator changes from ON to OFF. The solenoid valve or it's harness has failed. Repeat this step (Step 1) to verify the solenoid valve failure. Repair or replace the solenoid valve and or it's harness. STOP.

2. Check the solenoid.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. The solenoid remains disconnected from the machine harness.

c. At the machine harness connector for the solenoid, measure the resistance between contact 1 and contact 2.

NOTE: The approximate coil resistance of the solenoid valve is 16-22 ohms.

Expected Result: The resistance should be approximately 16-22 ohms.

Results:

* OK - Resistance is approximately 16-22 ohms. It is unlikely that the Autodig ECM is faulty. Perform these steps again. Also recheck to see if fault present indicator is ON for this fault. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - Resistance is NOT between 16-22 ohms (no continuity). The solenoid is faulty. Repair or replace the solenoid. STOP.

FMI 06

This fault is recorded when the Autodig ECM detects that there is a short circuit to ground in the electrical path from the Autodig ECM to the solenoid.

NOTE: Before performing this procedure, use the Control Solenoid Connector Contact table to determine the connector contact that corresponds to the faulty circuit. Refer to Systems Operation, Testing and Adjusting, "Connector Contact Numbers" for the Control Solenoid Connector Contacts table.

NOTE: The following steps may create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

1. Check the solenoid.

a. Turn the engine start switch and the battery disconnect switch to the ON position.

b. Put the Caterpillar Monitoring System in service mode with the same fault on-hold.

c. Ensure that the fault present indicator is ON.

d. Observe the ON/OFF status of the fault present indicator.

e. Disconnect the solenoid coil from the machine harness.

Expected Result: The fault present indicator should remain ON.

Results:

* OK - Fault present indicator remains ON. The machine harness or Autodig ECM is faulty. Proceed to Step 2.

* NOT OK - Fault present indicator changes from ON to OFF. The solenoid coil or the harness has failed. Repeat this step (Step 1) in order to verify the solenoid coil failure. Repair or replace the solenoid coil and/or it's harness.

2. Check for a shorted harness.

a. Turn the engine start switch and the battery disconnect switch to the OFF position. The solenoid coil of Step 1 remains disconnected.

b. Disconnect both machine harness connectors from the Autodig ECM.

c. At the machine harness connector for the Autodig ECM, measure the resistance between the contact for the faulty solenoid circuit and contact J2-69 (ground). Refer to Systems Operation, Testing and Adjusting, "Connector Contact Numbers" for the Control Solenoid Connector Contacts table to determine the solenoid connector contact.

Expected Result: The resistance reading should be greater than 5000 ohms.

Results:

* OK - Resistance is greater than 5000 ohms (no continuity). It is unlikely that the Autodig ECM is faulty. Perform these steps again. Also recheck to see if fault present indicator is ON for this fault. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - Resistance is less than 5000 ohms (continuity). The corresponding solenoid valve wire is shorted to ground in the machine harness. Repair or replace the machine harness. STOP.

CID 364 Procedure (Lift Head End Pressure Sensor) CID 458 Procedure (Tilt Rod End Pressure Sensor) CID 765 Procedure (Tilt Head End Pressure Sensor) CID 769 Procedure (Lift Rod End Pressure Sensor)

SMCS Code: 5741-038-NS

FMI 03

This fault is recorded when the Autodig ECM senses an open circuit/short to +battery in the signal from the pressure sensors. All pressure sensors are frequency type sensors.

1. Check the harness ground circuit.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the pressure sensor at the machine harness connector.

c. At the machine harness connector for the pressure sensor, measure the resistance from contact B (ground) to frame ground.

Expected Result: The resistance should be 2 ohms or less.

Results:

* OK - The resistance is 2 ohms or less. The machine harness is correct. Proceed to Step 2.

* NOT OK - The resistance is NOT 2 ohms or less. The machine harness is faulty. Repair or replace the machine harness. STOP.

NOTE: The following steps can create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

2. Check the harness signal circuit.

a. Turn the engine start switch and the battery disconnect switch to the ON position.

b. Disconnect the machine harness connector from the sensor.

c. At the machine harness connector for the sensor, measure the voltage between contact C (signal) and contact B (ground).

Expected Result: The voltage should measure approximately 5 DCV.

Results:

* OK - The voltage is approximately 5 DCV. The voltage is correct. Replace the sensor. STOP.

* NOT OK - The voltage is NOT approximately 5 DCV. The voltage is NOT correct. Proceed to Step 3.

3. Check for an open signal circuit.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. The sensor remains disconnected from the machine harness.

c. Disconnect the machine harness from the Autodig ECM.

d. Place a jumper wire between contact C (signal) and contact B (ground) of the machine harness connector for the sensor.

e. At the machine harness connector of the Autodig ECM, measure the resistance between the signal contact and frame ground.

Expected Result: The resistance measures less than 10 ohms.

Results:

* OK - The resistance measures less than 10 ohms. The circuit is correct. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - The resistance is NOT less than 10 ohms. The circuit is open. Repair or replace the machine harness. STOP.

FMI 04

This fault code is recorded when the Autodig ECM registers a short circuit to ground in the corresponding pressure sensor. All pressure sensors are frequency type sensors.

1. Check the signal wire for shorts.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the machine harness connector from the pressure sensor.

c. Disconnect both the machine harness connectors from the Autodig ECM.

d. At the machine harness connector for the Autodig ECM, measure the resistance of the pressure sensor signal wire to frame ground.

Reference: Refer to Systems Operation, Testing and Adjusting, "Connector Contact Numbers" for the Sensor Contacts table to determine the sensor contacts.

Expected Result: The resistance is greater than 5000 ohms.

Results:

* OK - Resistance is greater than 5000 ohms. The machine harness is correct. Proceed to Step 2.

* NOT OK - Resistance is NOT greater than 5000 ohms. The machine harness is faulty. Check the machine harness connectors, ensure they are clean and tight. Repair or replace the machine harness and/or connectors. STOP.

2. Check for +battery at the sensor.

a. Reconnect the machine harness connectors for the Autodig ECM.

b. Reconnect the machine harness connector for the pressure sensor.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. Using 7X-1710 cable probes, backprobe the machine harness connector for the position sensor, measure the voltage between contacts A (+battery) and B (ground).

Expected Result: The voltage should be approximately 24 DCV.

Results:

* OK - The voltage is approximately 24 DCV. Proceed to Step 3.

* NOT OK - The voltage is NOT approximately 24 DCV. The machine harness is faulty. Check all machine harness connectors, ensure they are clean and tight. Repair or replace the machine harness and/or connectors. STOP.

NOTE: The following step can create other faults that the Autodig ECM detects. Ignore these created faults and clear them when the fault is corrected.

3. Check the sensor.

a. The engine start switch and the battery disconnect switch remain in the ON position.

b. The pressure sensor remains connected to the machine harness.

c. Ensure that the corresponding fault is on-hold and the fault present indicator is on.

d. Disconnect the pressure sensor from the machine harness.

e. Check to see if the fault present indicator is ON or OFF.

NOTE: The Caterpillar Monitoring System can take up to 30 seconds before updating the display area.

Expected Result: The fault present indicator turns OFF.

Results:

* OK - The fault present indicator turns OFF. The pressure sensor is faulty. Replace the sensor. STOP.

* NOT OK - The fault present indicator remains ON. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

FMI 08

This fault is recorded when the Autodig ECM senses an abnormal signal in the corresponding pressure sensor. All pressure sensors are PWM type sensors.

NOTE: This fault can also be caused by a hydraulic control pilot pressure switch functioning incorrectly while the bucket is moved unexpectedly by the operator, or pilot system hydraulic pressure is too high due to a failed relief valve.

1. Check the harness ground circuit.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the pressure sensor at the machine harness connector.

c. At the machine harness connector for the pressure sensor, measure the resistance from contact B (ground) to frame ground.

Expected Result: The resistance should be 2 ohms or less.

Results:

* OK - The resistance is 2 ohms or less. The machine harness is correct. Proceed to Step 2.

* NOT OK - The resistance is NOT 2 ohms or less. The machine harness is faulty. Repair or replace the machine harness. STOP.

2. Check the machine harness and connectors.

a. The engine start switch and the battery disconnect switch remain in the OFF position.

b. Inspect the machine harness for chafing and/or damage. Inspect and clean all connectors related to the pressure sensor in the machine harness. All connectors should be clean and tight.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. Check to see if the fault is still active.

Expected Result: The fault is no longer active.

Results:

* OK - The fault is no longer active. There was a loose or dirty machine harness connector. Clear the logged fault. STOP.

* NOT OK - The fault is still active. Proceed to Step 3.

3. Check Sensor.

a. Connect ET (Electronic Technician) to the machine and enter the status mode for the Autodig ECM.

b. Select the appropriate pressure sensor to display the sensor status.

c. Start the machine and cycle the bucket/lift arms slowly and observe the status screen. Check for any sudden changes in pressure in the appropriate pressure sensor.

Expected Results: The lift/tilt pressure changes erratically.

Results:

* OK - The lift/tilt pressure changes erratically. The pressure sensor is faulty. Replace the pressure sensor and recheck. STOP.

* NOT OK - The lift/tilt pressure sensor does NOT change erratically. The pressure sensor is functioning correctly. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

CID 965, CID 1588 Procedure (Mode Selection Switch)

SMCS Code: 5741-038-ZS

FMI 02

This fault is recorded when more than one input is grounded to the Autodig ECM, or all inputs are open (data intermittent).

Reference: For the correct trouble shooting procedure refer to "CID 965, CID 1588 Procedure (Mode Selection Switch) FMI 03" for the machine that is being serviced.

FMI 03

This fault is recorded when the status of all the mode selection switch input set to the Autodig ECM are open or shorted to +battery.

1. Check the harness ground circuit.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the switch from the machine harness.

c. At the machine harness connector for the switch, measure the resistance between contact 1 (wire 299-BK) and frame ground.

Expected Result: The resistance is 2 ohms or less.

Results:

* OK - Resistance is 2 ohms or less. Proceed to Step 2.

* NOT OK - Resistance is greater than 2 ohms, the harness ground circuit is faulty. Wire 299-BK is open in the machine harness between the switch connector and frame ground. Repair or replace the machine harness. STOP.

2. Check the switch.

NOTE: Step 2 can create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

a. Turn the engine start switch and the battery disconnect switch to the ON position.

b. The machine harness connector for the switch remains disconnected.

c. Put the Caterpillar Monitoring System in service mode with the same fault on-hold.

d. Ensure that the fault present indicator is ON.

e. At the machine harness connector for the switch, jumper the ground contact (contact 1) to all the other contacts (contacts 2-5) separately and observe the ON/OFF status of the fault present indicator for each contact.

Reference: Refer to Systems Operation, Testing and Adjusting, "CID 965, CID 1588 Procedure (Mode Selection Switch)" for the Mode Selection Input Continuity table to determine the connector contacts.

Expected Result: The fault present indicator should remain ON.

Results:

* OK - Fault present indicator remains ON. Proceed to Step 3.

* NOT OK - Fault present indicator changes from ON to OFF. Repeat this step (Step 2) to verify the switch failure. Repair or replace the switch and or it's harness. STOP.

3. Check the logic control module.

NOTE: Step 3 can create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the logic control module from the machine harness.

c. Connect the mode selection switch to one of the machine harness connectors for the logic control module.

d. Place a jumper between pin 1 and one of the pins (pin 2 to 5) of the remaining machine harness connector for the logic control module or, if available connect another mode selection switch.

e. Turn the battery disconnect switch and key start switch to the ON position.

f. Put the Caterpillar Monitoring System in service mode with the same fault on-hold.

g. Cycle both the mode selection switches (or jumper) through the 4 positions, and observe the ON/OFF status of the fault present indicator.

Expected Result: The fault present indicator remains OFF.

Results:

* OK - The fault present indicator remains OFF. The logic control module is faulty or set incorrectly. Contact your Elphinstone dealer. STOP.

* NOT OK - The fault present indicator remains ON. Proceed to Step 4.

4. Check the harness circuit.

This step checks the continuity of the entire harness circuit including the switch(es) that was previously checked in Step 2.

a. Turn the battery disconnect switch and key start switch to the OFF position.

b. The mode selection switches/jumper remain connected to the machine harness connectors for the logic control module.

c. Disconnect machine harness connector J1 from the Autodig ECM.

d. Check the continuity to frame ground of the mode select switch inputs at the machine harness connector for the Autodig ECM.

Reference: For the connector contact numbers, refer to the Mode Switch Continuity table.

Expected Result: The continuity check does NOT agree with the Mode Selection Input Continuity table.

Results:

* OK - The continuity check does NOT agree with the Mode Selection Input Continuity table. The machine harness between the Autodig ECM and logic control module is faulty. Repair or replace the harness. STOP.

* NOT OK - The continuity check does agree with the Mode Selection Input Continuity table. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

G = Grounded, O = Open

CID 1059 Procedure (Lift Pilot Pressure Switch) CID 1060 Procedure (Lower Pilot Pressure Switch) CID 1061 Procedure (Tilt Back Pilot Pressure Switch) CID 1062 Procedure (Dump Pilot Pressure Switch)

SMCS Code: 5741-038-QW

Each of these switches has two inputs to the Autodig ECM; N/O and N/C. During proper operation, one of the inputs is open and the other input is grounded. This fault is detected when the status (open or grounded) is the same for the N/O and N/C inputs of the ECM.

FMI 03

This fault is recorded when the status of both the N/O and N/C switch inputs of the Autodig ECM are open, or shorted to +battery.

1. Check the harness ground circuit.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the pressure switch from the machine harness.

c. At the machine harness connector for the switch, measure the resistance between contact A (wire 299-BK) and frame ground.

Expected Result: The resistance is 2 ohms or less.

Results:

* OK - Resistance is 2 ohms or less. Proceed to Step 2.

* NOT OK - Resistance is greater than 2 ohms, the harness ground circuit is faulty. Wire 299-BK is open in the machine harness between the switch connector and frame ground. Repair or replace the machine harness. STOP.

2. Check the switch.

NOTE: Ensure that the desired fault CID/FMI 03 is on-hold and that the fault present indicator is ON.

NOTE: Step 2 can create other faults that the ECM detects. Ignore these created faults and clear them when this fault is corrected.

a. Turn the engine start switch and the battery disconnect switch to the ON position.

b. The machine harness connector for the pressure switch remains disconnected.

c. Put the Caterpillar Monitoring System in service mode with the same fault on-hold.

d. Ensure that the fault present indicator is ON.

e. Observe the ON/OFF status of the fault present indicator, while at the machine harness connector for the switch, jumper the N/C contact (contact C) to common contact (contact A).

Expected Result: The fault present indicator should remain ON.

Results:

* OK - Fault present indicator remains ON. There is an open circuit in the machine harness between the Autodig ECM and the switch. Repair or replace the machine harness. STOP.

* NOT OK - Fault present indicator changes from ON to OFF. Repeat this step (Step 2) to verify the switch failure. Repeat or replace the switch and/or it's harness. STOP.

FMI 04

This fault is recorded when the status of both the N/O and N/C switch inputs of the ECM are grounded.

NOTE: Step 1 can create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

1. Check the switch.

a. Ensure that the fault is on-hold and that the fault present indicator is ON.

b. Observe the ON/OFF status of the fault present indicator, while disconnecting the connector of the switch from the machine harness.

Expected Result: The fault present indicator should remain ON.

Results:

* OK - Fault present indicator remains ON. There is a short circuit in the machine harness from the control to the switch. Repair or replace the machine harness. STOP.

* NOT OK - Fault present indicator changes from ON to OFF. Proceed to Step 2.

2. Recheck the switch.

This step rechecks the switch to verify the switch failure.

a. With the switch still disconnected, scroll the Caterpillar Monitoring System through the fault codes to see if a FMI 03 (open circuit) fault is active for this switch.

Expected Result: The CID/FMI 03 fault is active.

Results:

* OK - The CID/FMI 03 fault is active. The switch has failed. Repair or replace the switch. STOP.

* NOT OK - The CID/FMI 03 is NOT active. There is a short circuit to ground in the machine harness. Repair or replace the machine harness. STOP.

CID 1063 Procedure (Cab Enable Switch)

SMCS Code: 7332-038; 5741-038

FMI 04

This fault is recorded when the Autodig ECM senses the Autodig enable switch is grounded for 10 seconds or more (switch signal short to ground).

1. Check the switch.

a. Ensure that the fault is on-hold and that the fault present indicator is ON.

b. Observe the ON/OFF status of the fault present indicator.

c. Disconnect the connector of the switch from the machine harness.

Expected Result: The fault present indicator should remain ON.

Results:

* OK - Fault present indicator remains ON. Proceed to Step 2.

* NOT OK - Fault present indicator changes from ON to OFF. Repeat this step (Step 1) in order to verify the switch failure. Repair or replace the switch and or it's harness. STOP.

2. Check the harness circuit.

This step checks the continuity of the entire harness circuit that is faulty; including the switch which was previously checked in Step 1.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Connect the switch of Step 1 to the machine harness.

c. Disconnect the machine harness connector J1 from the Autodig ECM.

d. At the machine harness connector for the Autodig ECM, check the continuity of the contact J1-28 (wire H819-GY) to frame ground with the switch activated and not activated.

Reference: Refer to Systems Operation, Testing and Adjusting, "Connector Contact Numbers" for the Switch Continuity table to determine the connector contacts.

Results:

* OK - Continuity check agrees with the Switch Continuity table. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - Continuity check does NOT agree with the Switch Continuity table. There is a short circuit to ground in the machine harness between the ECM and the switch. Repair or replace the machine harness. STOP.

CID 1068 Procedure (Hood Indicator Light)

SMCS Code: 5741-038; 7431-038-HK

FMI 03

This fault is recorded when the Autodig ECM detects that there is a short circuit to +battery in the electrical path from the ECM to the indicator light.

NOTE: This procedure causes the Autodig ECM to log an open circuit diagnostic code for the indicator light. Clear this code after troubleshooting.

1. Check the component.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the machine harness connector from the indicator light.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. At the machine harness connector for the indicator light, measure the voltage from the Autodig ECM between contact 1 and contact 2.

Expected Result: The voltage reading should be approximately the same as the battery voltage.

Results:

* OK - Voltage is approximately battery voltage. Proceed to Step 2.

* NOT OK - Voltage is approximately 0 DCV. Replace the indicator light. STOP.

2. Inspect the harness.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect both the machine harness connectors from the Autodig ECM.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. At the machine harness connector for the Autodig ECM, measure the voltage between both the return (contact J2-36), and the signal (contact J2-55) for the indicator light to ground (contact J2-69). Refer to the Component Information table.

Expected Result: The voltage reading should be approximately 0 DCV.

Results:

* OK - Voltage is approximately 0 DCV. Proceed to Step 3.

* NOT OK - Voltage is approximately battery voltage; there is a short circuit to +battery in the machine harness between the Autodig ECM and the indicator light. Repair or replace the harness. STOP.

3. Check if the fault remains.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Inspect, clean and reconnect all related harness connectors.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. Enter service mode on the Caterpillar Monitoring System.

e. Operate the machine, check to see if the same fault is present.

Expected Result: The fault should not be present.

Results:

* OK - Fault is NOT present. The initial fault was probably caused by a poor electrical connection at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation. STOP.

* NOT OK - Fault is present. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

FMI 05

This fault is recorded when the Autodig ECM detects that there is not a complete electrical path from the Autodig ECM to the indicator light (open circuit).

NOTE: The following steps may create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

1. Check for an open circuit harness.

a. Turn the engine start switch and the battery disconnect switch to the ON position.

b. Put the Caterpillar Monitoring System in service mode with the same fault on-hold.

c. Ensure that the fault present indicator is ON.

d. Disconnect the indicator light from the machine harness.

e. Observe the ON/OFF status of the fault present indicator, while at the machine harness connectors for the indicator light, place a jumper between the two contacts.

Expected Result: The fault present indicator should remain ON.

Results:

* OK - Fault present indicator remains ON. The machine harness or Autodig ECM is faulty. Proceed to Step 2.

* NOT OK - Fault present indicator changes from ON to OFF. The indicator light and/or it's harness has failed. Repeat this step (Step 1) to verify the failure. Repair or replace the indicator light. STOP.

2. Check the light.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Remove the jumper of Step 1.

c. Reconnect the light to the machine harness.

d. Disconnect both the machine harness connectors from the Autodig ECM.

e. At the machine harness connector for the Autodig ECM, measure the resistance between light signal wire J2-55 (H826-PK) and the return wire J2-36 (H807-YL).

Expected Result: The resistance should be less than 5000 ohms.

Results:

* OK - Resistance is less than 5000 ohms (continuity). It is unlikely that the Autodig ECM is faulty. Perform these steps again. Also recheck to see if fault present indicator is ON for this fault. If the cause is not found, replace the ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - Resistance is greater than 5000 ohms (no continuity). Repair or replace the machine harness. STOP.

FMI 06

This fault is recorded when the Autodig ECM detects that there is a short circuit to ground in the electrical path from the Autodig ECM to the indicator light.

NOTE: The following steps may create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

1. Check the component.

a. Turn the engine start switch and the battery disconnect switch to the ON position.

b. Put the Caterpillar Monitoring System in service mode with the same fault on-hold.

c. Ensure that the fault present indicator is ON.

d. Observe the ON/OFF status of the fault present indicator.

e. Disconnect the component from the machine harness.

Expected Result: The fault present indicator should remain ON.

Results:

* OK - Fault present indicator remains ON. The machine harness or Autodig ECM is faulty. Proceed to Step 2.

* NOT OK - Fault present indicator changes from ON to OFF. The component has failed. Repeat this step (Step 1) in order to verify the component failure. Repair or replace the component. STOP.

2. Check for a shorted harness.

a. Turn the engine start switch and the battery disconnect switch to the OFF position. The component of Step 1 remains disconnected.

b. Disconnect both machine harness connectors from the Autodig ECM.

c. At the machine harness connector for the Autodig ECM, measure the resistance between contact J2-69 (ground) and the signal wire J2-55 (H826-PK). Refer to the Component Information table.

Expected Result: The resistance reading should be greater than 5000 ohms.

Results:

* OK - Resistance is greater than 5000 ohms (no continuity). It is unlikely that the ECM is faulty. Perform these steps again. Also recheck to see if the fault present indicator is ON for this fault. If the cause is not found, replace the ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - Resistance is less than 5000 ohms (continuity). The component wire is shorted to ground in the machine harness. Repair or replace the machine harness. STOP.

CID 1069 Procedure (Remote Lift Input Signal) CID 1070 Procedure (Remote Lower Input Signal) CID 1071 Procedure (Remote Tilt Back Input Signal) CID 1072 Procedure (Remote Dump Input Signal)

SMCS Code: 5741-038; 7000-038-RCT

FMI 00

This fault is recorded when the Autodig ECM senses the relevant implement control signal as having a value too high (FMI 00).

FMI 01

This fault is recorded when the Autodig ECM senses the relevant implement control signal as having a value too low (FMI 01).

NOTE: The following procedure is also used for FMI 00.

The remote control implement inputs are PWM type inputs.

1. Check the remote control implement settings.

a. Check the remote control maximum and minimum PWM settings for implement control.

Reference: Refer to the manufacturer's instructions, or contact the supplier of the transmitter and receiver to retrieve/change the implement PWM settings.

Expected Results: The minimum/maximum PWM settings for the specific implement control are outside 10% to 90%.

Results:

* OK - The minimum/maximum PWM settings for the specific implement control are outside 10% to 90%. Adjust the minimum/maximum PWM signal to inside 10% to 90% and recheck. STOP.

* NOT OK - The minimum/maximum PWM settings for the specific implement control is NOT outside 10% to 90%. Proceed to Step 2.

2. Check the signal wire for a short to +battery.

a. Turn the engine start switch, the battery disconnect switch and the remote control switch to the OFF position.

b. Disconnect the remote control interconnect harness from the receiver.

c. Disconnect both the machine harness connectors for the Autodig ECM.

d. Turn the engine start switch, the battery disconnect switch and the remote control switch to the ON position.

e. At the machine harness connector for the Autodig ECM measure the voltage from the signal contact to frame ground. Refer to the Remote Control Information table.

Expected Result: The voltage is approximately 0 DCV.

Results:

* OK - The voltage is approximately 0 DCV. Proceed to Step 3.

* NOT OK - The voltage is approximately battery voltage. There is a short circuit to +battery in the machine harness. Repair or replace the machine harness.

3. Check the remote control receiver.

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NOTICE
This step changes the implement controls to determine where the fault lies. The implement control signals must be reset after performing this procedure.

NOTE: This step may create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Reconnect the machine harness connectors for the Autodig ECM from Step 2.

c. Reconnect the remote control interconnecting harness to the remote receiver from Step 2.

d. At the remote control interface logic box remove the four proportional implement control relays (relay numbers 13, 14, 15 & 16).

e. At the proportional relay bases, place a jumper wire between contact 87 for the faulty circuit (refer to the Remote Control Information table) to contact 30 of one of the bucket control functions with no fault active.

f. Turn the engine start switch, the battery disconnect switch and the remote control switch to the ON position.

NOTE: Do not start the engine.

g. Place the Caterpillar Monitoring System into service mode, and check the status of the fault present indicator.

h. On the remote control transmitter, cycle the parking brake control through OFF to ON, and back to OFF (this enables the implement controls).

i. Cycle the bucket function chosen for the replacement of the faulty circuit, and observe the status of the fault present indicator.

Reference: For more information on the remote control interface logic box, refer to the Remote Control Logic Interface Schematic for the machine that is being serviced.

Expected Result: The fault present indicator remains OFF.

Results:

* OK - The fault present indicator remains OFF. The remote control receiver is faulty for the particular bucket function. Repair or replace the remote control receiver. STOP.

* NOT OK - The fault present indicator remains in the ON position. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

FMI 03

This fault code is recorded when the Autodig ECM registers a open circuit or short to +battery (FMI 03) from the corresponding remote signal. All bucket control remote signals are PWM type signals.

NOTE: With no remote control receiver connected this fault (FMI 03) will become active for all remote input signals if the dash remote control switch is activated (if equipped).

NOTE: The remote control interface logic box must have +24 DCV (remote control switch turned on) for the logic control relays to complete the bucket control signal path from the remote control receiver to the Autodig ECM.

NOTE: The following steps can create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

1. Check the supply voltage at the remote receiver.

a. Disconnect the remote control interconnect harness at the receiver.

b. Turn the engine start switch, the battery disconnect switch and the remote control switch to the ON position.

c. Check the voltage at the interconnect harness connector of the receiver from contact W (ground) to contact V and contact X (+battery).

Expected Result: The voltage should measure approximately 24 DCV.

Results:

* OK - The voltage measures approximately 24 DCV. The voltage is correct. Proceed to Step 3.

* NOT OK - The voltage does NOT measure approximately 24 DCV. There is an open circuit in the machine harness or interface logic box. Proceed to Step 2.

2. Check for an open supply circuit.

a. The remote control interconnect harness remains disconnected from the receiver.

b. The engine start, the battery disconnect and the remote control switch remain in the ON position.

c. At the remote control receiver interconnect harness, measure the voltage from contacts V and X (supply) to frame ground.

Expected Results: The voltage should measure approximately 24 DCV.

Results:

* OK - The voltage measures approximately 24 DCV. The return circuit is open. Repair or replace the machine harness and/or remote control interface logic box. STOP.

* NOT OK - The voltage does NOT measure approximately 24 DCV. The supply circuit is open. Repair or replace the machine harness and/or remote control interface logic box. STOP.

3. Check the signal circuit.

NOTE: To provide a complete signal path from the remote control receiver to the Autodig ECM, the remote control interface logic box requires power to energize the proportional relays. The engine start switch, the battery disconnect switch and the remote control switch must be in the ON position.

a. The remote control interconnect harness remains disconnected from the receiver.

b. The engine start switch, the battery disconnect switch and the remote control switch remain in the ON position.

c. At the interconnect harness for the remote receiver, measure the voltage between contact W (ground) and the corresponding signal contact. Refer to the Remote Control Information table to determine the connector contact.

Expected Result: The voltage should measure approximately 5 DCV.

Results:

* OK - The voltage is approximately 5 DCV. The voltage is correct. The remote receiver is faulty. Repair or replace the receiver. STOP.

* NOT OK - The voltage is NOT approximately 5 DCV. The voltage is NOT correct. Proceed to Step 4.

4. Check the signal wire for shorts.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. The remote control interconnect harness remains disconnected from the receiver.

c. Disconnect both the machine harness connectors for the Autodig ECM.

d. Turn the engine start switch, the battery disconnect switch and the remote control switch to the ON position.

e. At the machine harness connector for the Autodig ECM measure the voltage from the signal contact to all possible sources of +battery contacts.

f. At the machine harness connector for the Autodig ECM measure from the signal contact to all possible sources of ground contacts.

Reference: Refer to the Remote Control Information table.

Expected Result: Each measurement is approximately 0 DCV.

Results:

* OK - Each measurement is approximately 0 DCV. Proceed to Step 5.

* NOT OK - The voltage is NOT approximately 0 DCV. There is a short in the machine harness. Repair or replace the machine harness. STOP.

5. Check for an open signal circuit.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. The remote control receiver remains disconnected at the interconnect harness.

c. Both the machine harness connectors from the Autodig ECM remain disconnected.

d. At the interconnecting harness for the remote control receiver, place a jumper wire between contact W (ground) and the contact for the faulty circuit at the remote control receiver connector.

Reference: Refer to the Remote Control Information table to determine the connector contact.

e. Turn the engine start switch, the battery disconnect switch and the remote control switch to the ON position.

f. At the machine harness connector of the Autodig ECM, measure the resistance between the signal contact and frame ground.

Expected Result: The resistance measures less than 10 ohms.

Results:

* OK - The resistance measures less than 10 ohms. The circuit is correct. It is unlikely that the Autodig ECM is faulty. Perform these steps again. Also recheck to see if fault present indicator is ON for this fault. If the cause is not found, replace the ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - The resistance is greater than 10 ohms. The circuit is open. Repair or replace the machine harness. STOP.

FMI 04

This fault code is recorded when the Autodig ECM registers a short circuit to ground (FMI 04) from the corresponding remote signal. All bucket control remote signals are PWM type signals.

NOTE: The remote control interface logic box must have +24 DCV (remote control switch turned on) for the logic control relays to complete the implement control signal path from the remote control receiver to the Autodig ECM.

NOTE: The following steps can create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

1. Check for an open supply circuit.

a. Disconnect the remote control interconnect harness from the receiver.

b. Turn the engine start switch, the battery disconnect switch and the remote control switch to the ON position.

c. At the remote control receiver interconnect harness, measure the voltage from contacts V and X (supply) to frame ground.

Expected Results: The voltage should measure approximately 24 DCV.

Results:

* OK - The voltage measures approximately 24 DCV. The supply circuit is correct. Proceed to Step 2.

* NOT OK - The voltage does NOT measure approximately 24 DCV. The supply circuit is open. Repair or replace the machine harness and/or remote control interface logic box. STOP.

2. Check the signal circuit.

NOTE: To provide a complete signal path from the remote control receiver to the Autodig ECM, the remote control interface logic box requires power to energize the proportional relays. The engine start switch, the battery disconnect switch and the remote control switch must be in the ON position.

a. Turn the engine start switch, the battery disconnect switch and the remote control switch to the OFF position.

b. The remote control interconnect harness remains disconnected from the receiver.

c. Disconnect both the machine harness connectors from the Autodig ECM.

d. Turn the engine start switch, the battery disconnect switch and the remote control switch to the ON position.

e. At the Autodig ECM measure the resistance between the contact for the faulty bucket control circuit and frame ground.

Reference: Refer to the Remote Control Information table.

Expected Result: The resistance should measure less than 10 ohms.

Results:

* OK - The resistance measures less than 10 ohms. There is a short circuit to ground in the corresponding implement circuit. Proceed to Step 3.

* NOT OK - The resistance is NOT less than 10 ohms. The circuit is correct. It is unlikely that the Autodig ECM is faulty. Perform these steps again. Also recheck to see if fault present indicator is ON for this fault. If the cause is not found, replace the ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

3. Check the implement circuit.

a. The remote control interconnect harness and both the machine harness connectors for the Autodig ECM remain disconnected.

b. Disconnect the remote control interface logic box at the logic lead out plug.

c. At the Autodig ECM measure the resistance between the contact for the faulty implement circuit and frame ground.

Reference: Refer to the Remote Control Information table.

Expected Result: The resistance should measure less than 10 ohms.

Results:

* OK - The resistance measures less than 10 ohms. The short circuit to ground is not in the remote control receiver to interface logic box circuit. The short circuit is in the machine harness. Repair or replace the machine harness. STOP.

* NOT OK - The resistance does NOT measure less than 10 ohms (open circuit). The short circuit to ground is between the remote control receiver plug and the interface logic box. Repair or replace the machine harness and/or logic box. STOP.

CID 1396 Procedure (Implement Solenoid Ground Interrupt Relay)

SMCS Code: 5741-038-R7

FMI 03

This fault is recorded when the Autodig ECM detects that there is a short circuit to +battery in the electrical path from the Autodig ECM to the implement solenoid ground interrupt relay.

1. Inspect the harness.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect both the machine harness connectors from the Autodig ECM.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. At the machine harness connector for the Autodig ECM, measure the voltage between the contact J2-45 (wire H766-YL) and ground (contact J2-69).

Expected Result: The voltage reading should be approximately 0 DCV.

Results:

* OK - Voltage is approximately 0 DCV. Proceed to Step 3.

* NOT OK - Voltage is approximately battery voltage; there is a short circuit to +battery in the machine harness. Repair or replace the harness. STOP.

2. Check if the fault remains.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Inspect, clean and reconnect all related harness connectors.

c. Turn the engine start switch and the battery disconnect switch to the ON position.

d. Enter the service mode on the Caterpillar Monitoring System.

e. Check to see if the status of the fault present indicator is still ON.

Expected Result: The fault present indicator is OFF.

Results:

* OK - Fault present indicator is OFF. The initial fault was probably caused by a poor electrical connection at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation. STOP.

* NOT OK - Fault present indicator is NOT OFF. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

FMI 05

This fault is recorded when the Autodig ECM detects that there is an open circuit in the electrical path from the Autodig ECM to the implement solenoid ground interrupt relay and back to the Autodig ECM.

1. Check the signal circuit.

a. Turn the engine start switch and the battery disconnect switch to the ON position.

b. Disconnect the relay from the machine harness.

c. At the machine harness connector for the relay, measure the voltage from the ECM between contact 1 (signal) and frame ground.

Expected Result: The voltage reading should be approximately 0 DCV.

Results:

* OK - Voltage is approximately 0 DCV. There is an open circuit in the machine harness. Repair or replace the machine harness. STOP.

* NOT OK - Voltage is approximately +battery voltage. The signal circuit is correct. Proceed to Step 2.

2. Check the return circuit.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. The relay remains disconnected from the machine harness.

c. Check the resistance at the machine harness connector for the relay from contact 2 (H807-YL) to frame ground.

Expected Result:The resistance is approximately 10 ohms or less.

Results:

* OK - The resistance is approximately 10 ohms or less. The return circuit is correct. Replace the relay. STOP.

* NOT OK - The resistance is NOT approximately 10 ohms or less. The return circuit is open in the machine harness. Repair or replace the harness. STOP.

FMI 06

This fault is recorded when the Autodig ECM detects that there is a short circuit to ground in the electrical path from the Autodig ECM to the implement solenoid ground interrupt relay.

NOTE: This step may create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

1. Check the relay.

a. Turn the engine start switch and the battery disconnect switch to the ON position.

b. Put the Caterpillar Monitoring System in service mode with the same fault on-hold.

c. Ensure that the fault present indicator is ON.

d. Observe the ON/OFF status of the fault present indicator.

e. Disconnect the relay from the machine harness.

Expected Result: The fault present indicator should remain ON.

Results:

* OK - Fault present indicator remains ON. The machine harness or Autodig ECM is faulty. Proceed to Step 2.

* NOT OK - Fault present indicator changes from ON to OFF. The relay has failed. Repeat this step (Step 1) in order to verify the relay failure. Replace the relay. STOP.

2. Check for a shorted harness.

a. Turn the battery disconnect switch to the OFF position. The relay remains disconnected.

b. Disconnect the machine harness connector J2 from the Autodig ECM.

c. At the machine harness connector for the Autodig ECM, measure the resistance between contact J2-69 (ground wire 299-BK) and contact J2-45 (signal wire H766-YL). Also check the resistance between contact J2-45 (signal wire H766-YL) and J2-36 (return wire H807-YL).

Expected Result: The resistance readings should be greater than 5000 ohms.

Results:

* OK - Resistance is greater than 5000 ohms (no continuity). It is unlikely that the ECM is faulty. Perform these steps again. Also recheck to see if fault present indicator is ON for this fault. If the cause is not found, replace the ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - Any resistance is less than 5000 ohms (continuity). The component wire is shorted to ground (or return) in the machine harness. Repair or replace the machine harness. STOP.

CID 1399 Procedure (Remote Enable Switch)

SMCS Code: 5741-038; 7332-038-RCT

FMI 03

This fault is recorded when the Autodig ECM senses the remote enable switch is shorted to +battery for 10 seconds or more.

NOTE: This step may create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

1. Check the harness signal circuit.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the logic lead out connector from the remote control interface logic box.

c. Turn the engine start switch, the battery disconnect switch and the remote control switch to the ON position.

d. At the logic lead out connector, check the voltage from contact 19 (remote enable) to contact 4 (ground).

Expected Result: The voltage is approximately 12 DCV.

Results:

* OK - The voltage is approximately 12 DCV. The voltage is correct. Proceed to Step 2.

* NOT OK - The voltage is NOT approximately 12 DCV. The harness has failed between the Autodig ECM and the remote control receiver. Repair or replace the machine harness. STOP.

2. Check the remote control receiver.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Reconnect the logic lead out connector to the remote control interface logic box.

c. Disconnect both machine harness connectors from the Autodig ECM.

d. Turn the engine start switch, the battery disconnect switch and the remote control switch to the ON position.

e. At the machine harness connector for the Autodig ECM measure the voltage from contact J2-31 (wire H820-GN) to contact J2-69 (wire 299-BK) with the remote enable switch activated and not activated.

Expected Result: The voltage measures approximately +battery voltage when activated and approximately 0 DCV when not activated.

Results:

* OK - The voltage measures approximately battery voltage when activated and approximately 0 DCV when not activated. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - The voltage does NOT measure approximately +battery voltage when activated and approximately 0 DCV when not activated. The remote control receiver is faulty. Repair or replace the remote control receiver. STOP.

CID 1587 Procedure (Isolation Switch)

SMCS Code: 5741-038; 7332-038

This switch has two inputs to the Autodig ECM; N/O and N/C. During proper operation, one of the inputs is open and the other input is grounded. This fault is detected when the status (open or grounded) is the same for the N/O and N/C inputs of the Autodig ECM.

FMI 03

This fault is recorded when the status of both the N/O and N/C switch inputs of the Autodig ECM are open, or shorted to +battery.

1. Check the harness ground circuit.

a. Turn the engine start switch and the battery disconnect switch to the OFF position.

b. Disconnect the isolation switch from the machine harness.

c. At the machine harness connector for the isolation switch, measure the resistance between contact 4 (wire 299-BK) and frame ground.

Expected Result: The resistance is 2 ohms or less.

Results:

* OK - Resistance is 2 ohms or less. Proceed to Step 2.

* NOT OK - Resistance is greater than 2 ohms, the harness ground circuit is faulty. Wire 299-BK is open in the machine harness between the switch connector and frame ground. Repair or replace the machine harness. STOP.

2. Check the switch.

NOTE: Step 2 can create other faults that the Autodig ECM detects. Ignore these created faults and clear them when this fault is corrected.

a. Turn the engine start switch and the battery disconnect switch to the ON position.

b. The machine harness connector for the isolation switch remains disconnected.

c. Put the Caterpillar Monitoring System in service mode with the CID 1587 FMI 03 fault on-hold.

d. Ensure that the fault present indicator is ON.

e. Observe the ON/OFF status of the fault present indicator for both of the following steps.

f. At the machine harness connector for the isolation switch, jumper the N/C contact (contact 2 wire E917-WH) to ground (contact 4 wire 299-BK).

g. Repeat Step 2f for the N/O contact (contact 1 wire E918-GN)

Expected Result: The fault present indicator should remain ON.

Results:

* OK - Fault present indicator remains ON. Proceed to Step 3.

* NOT OK - Fault present indicator changes from ON to OFF. Repeat this step (Step 2) to verify the switch failure. Repair or replace the switch and/or it's harness.

3. Check the harness circuit.

This step checks the continuity of the entire harness circuit that is related to this fault; including the switch which was previously checked in Step 2.

a. Turn the engine start switch and the battery disconnect switch to OFF position.

b. Remove the jumper of Step 2.

c. Connect the isolation switch to the machine harness.

d. Disconnect the machine harness connector J1 from the Autodig ECM.

e. At the machine harness connector for the Autodig ECM, check the continuity to ground of the N/C contact and the N/O contact with the switch activated and deactivated.

Reference: Refer to Systems Operation, Testing and Adjusting, "Connector Contact Numbers" for the Switch Continuity table to determine the connector contacts.

Expected Result: The continuity check agrees with the Switch Continuity table.

Results:

* OK - Continuity check agrees with the Switch Continuity table. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - Continuity check does NOT agree with the Switch Continuity table. There is an open circuit in the machine harness between the ECM and the isolation switch. Repair or replace the machine harness. STOP.

FMI 04

This fault is recorded when the status of both the N/O and N/C switch inputs of the ECM are grounded.

NOTE: Step 1 can create other faults that the ECM detects. Ignore these created faults and clear them when this fault is corrected.

1. Check the switch.

a. Ensure that the fault is on-hold and that the fault present indicator is ON.

b. Observe the ON/OFF status of the fault present indicator, while disconnecting the connector of the switch from the machine harness.

Expected Result: The fault present indicator should remain ON.

Results:

* OK - Fault present indicator remains ON. Proceed to Step 2.

* NOT OK - Fault present indicator changes from ON to OFF. Repeat this step (Step 1) with the switch activated and not activated in order to verify the switch failure. Replace the switch. STOP.

2. Check the harness circuit.

This step checks the continuity of the entire harness circuit that is faulty; including the switch which was previously checked in Step 1.

a. Turn the engine start switch and the battery disconnect switch to the OFF position. Connect the isolation switch of Step 1 to the machine harness.

b. Disconnect the machine harness from the Autodig ECM.

c. At the machine harness connector for the Autodig ECM, check the continuity to ground of the N/C contact and the N/O contact with the isolation switch activated and not activated.

Reference: Refer to Systems Operation, Testing and Adjusting, "Connector Contact Numbers" for the Switch Continuity table to determine the switch status.

Expected Result: The continuity check agrees with the Switch Continuity table.

Results:

* OK - Continuity check agrees with the Switch Continuity table. It is unlikely that the Autodig ECM is faulty. Perform these steps again. If the cause is not found, replace the Autodig ECM. STOP.

Reference: For the procedure to replace the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

* NOT OK - Continuity check does NOT agree with the Switch Continuity table. There is an open circuit in the machine harness between the Autodig ECM and the isolation switch. Repair or replace the machine harness. STOP.

General Testing and Adjusting Information

SMCS Code: 5741-025; 5741-081

Show/hide table

Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. Prevent possible injury by performing the procedure that follows before working on the machine.

1. Move the machine to a smooth level location. Move away from working machines and personnel.

2. Permit only one operator on the machine. Keep all other personnel either away from the machine or in view of the operator.

3. Engage the parking brake. Lower the bucket to the ground. Put blocks in front of and behind the wheels.

4. Install the steering frame lock pin so the machine can not turn. Stop the engine.

5. When the bucket is raised for tests or adjustments, be sure that the bucket and lift arm has correct support. The lift circuit has high oil pressure when the lift arms raise the front of the machine. Do not stop the engine with the front of the machine off the ground, unless a system test requires it. Lower the machine to the ground and stop the engine.

6. Make sure all hydraulic pressure is released before any hydraulic fitting, hose or component is loosened, tightened, removed or adjusted. To release the hydraulic system oil pressure refer to Systems Operation, Testing and Adjusting, Hydraulic System, "Hydraulic System Pressure - Release" for the machine that is being serviced.

Harness Connectors - Inspect

SMCS Code: 1408-546-CY; 5741-035

Intermittent electrical problems are often caused by poor connections. Use the following checks as a guide for inspecting connectors.

1. Check connector mating.

a. Ensure locking rings lock into place.

b. Ensure that locking clips are used on Sure Seal connectors.

c. Ensure that the screw in the center of the connector is tight.

d. Ensure that the connector contacts and sockets align properly.

2. Check wires at the connector.

a. Ensure that the wires enter the back of the connector straight, not at an angle.

b. Ensure that each wire is properly crimped into the proper connector contact.

c. Ensure that each connector contact is properly locked into the connector body.

d. When locked properly, the contact (or wire) cannot be pulled out of the connector body without excessive force.

3. Check each wire for nicks or signs of abrasion in the insulation.

4. Check for moisture at the connector. Possible sources are:

a. Damaged or lost connector seals.

b. Missing or loose wire hole plugs.

c. Wires not entering the back of the connector straight. If wires enter at an angle, there may not be a good seal between the connector and the wire insulation.

d. From other connectors with poor seals by traveling inside the wire insulation.

5. Check for dirty or corroded contacts.

a. Clean contacts with a cotton swab or a soft brush. Use isopropyl alcohol only.

6. Check each pin and socket.

a. Use a new pin and socket and check each contact of the connector for a snug fit. The new contact should stay connected if the connector is held with the contacts facing down.

Position Sensor (Lift Linkage and Tilt Linkage) - Calibrate

SMCS Code: 5736-524-LQ; 5736-524-T2; 5741-524

Show/hide table

Do not proceed with this calibration unless you have read and understand the following instructions and warnings. Failure to follow the instructions or heed the warnings could result in injury or death from crushing. This calibration will cause/create automatic bucket motion. This calibration may be aborted by releasing the Autodig enable switch or by moving the hydraulic control lever. Before calibrating: * Park the machine in an open area on level ground. * Provide adequate clearance for full range of bucket motion. Beware of hazards such as wires, ventilation, etc. * Clear all personnel from the machine and from the area. * Check visibility from the machine and from the area. * Fasten seat belt securely.

NOTE: The electrical system must not be shut off until all the calibration steps are completed, or the calibration will not be successful.

1. Engage the parking brake. Lower the bucket to the ground. Put blocks in front of and behind the wheels.

2. Install the steering frame lock pin so the machine can not turn.

3. Connect the Caterpillar Electronic Technician (ET) to the service port in the cab of the machine being serviced.

4. Start the engine.

5. Start the ET software and select "Autodig" from the "Available ECMs" dialog box on the "ECM Summary" display.

6. Select the "Service" drop-down menu.

7. Select the "Calibrations" function from the "Service" menu.

8. Select "Lift/Tilt Sensors Calibration" from the sub menu.

9. Read and understand the warning on the screen display. Press the "OK" button to continue with the calibration process. If necessary, press the "Cancel" button to cancel the calibration process.

10. Ensure the parking brake is engaged.

11. Click on the "Next>" button to continue with the calibration process. If necessary, press the "Cancel" button to cancel the calibration process.

12. Press and hold the Autodig enable switch to initiate the calibration.

13. To cancel the calibration process do one of the following:

a. Release the Autodig enable switch.

b. Move the hydraulic control lever past 20 percent of the lever travel.

c. Press the "Cancel" button on the ET display.

NOTE: The Autodig ECM will check for Autodig system faults before and during the calibration process. Calibration will not be initiated if a fault is detected before the calibration process. The calibration will be aborted if a fault is detected during the calibration process.

NOTE: During the following step the engine speed may be increased up to 1200 rpm to accelerate the calibration process.

14. During the calibration process, the bucket will automatically move to various positions. The calibration process is as follows:

a. Tilt back the bucket.

b. Lower to the ground.

c. After sensing the ground, record lift and tilt positions.

d. Raise to full lift height.

e. After sensing full lift, record lift position.

f. Dump the bucket.

g. After sensing the full dump, record tilt position.

h. Tilt back the bucket.

i. Lower to the ground.

j. Calculate lift and tilt angle, slope and intercept.

15. Soon after the bucket has returned to the ground a "Waiting for the Autodig enable switch to be released... ... ... ..." message is displayed. Release the Autodig enable switch to complete the calibration process.

16. The Lift/Tilt Sensors Calibration dialog box will be displayed. If "Calibration Successful" is displayed, press the "Finish" button and exit from the ET software program. If "Calibration Unsuccessful" is displayed, close the Lift/Tilt Sensors Calibration dialog box and perform Step 17.

17. Check the Autodig system for active or logged faults.

18. Perform Steps 6 through 16 after rectifying any active or logged faults.

Position Sensor (Lift Linkage) - Adjust

SMCS Code: 5736-025-LQ

1. Engage the parking brake. Put the lift arms in the full lower position and lower the bucket to the ground. Put blocks in front of and behind the wheels.

2. Install the steering frame lock pin so the machine can not turn.

3. Stop the engine.

Lift Linkage Position Sensor Lever Initial Adjustment

(1) Shaft.

(2) Lever.

(3) Bolt.

4. If the lift linkage position sensor is to be installed on the loader frame before adjusting the position sensor, perform the following steps.

a. Install lever (2) on position sensor assembly shaft (1). Rotate lever (2) until dimension (A) is achieved. Refer to the table that follows:

b. Tighten lever locking bolt (3).

Lift linkage Position Sensor

(1) Shaft.

(2) Lever.

(3) Bolt.

(4) Spring.

c. Attach spring (4) to the position sensor assembly. Install the lift linkage position sensor on the loader frame (as shown).

5. Connect the Caterpillar Electronic Technician (ET) to the ET service port in the cab of the machine being serviced.

6. Turn the engine start switch to the ON position, but do not start the engine.

7. Start the ET software and select "Autodig" from the "Available ECMs" dialog box on the "ECM Summary" display.

8. Select the "Status Tool" icon from the toolbar.

9. Create a "<Temporary Group>" which includes the "Autodig LHD Lift Link Position" parameter. Refer to Caterpillar Service Tool Software/ User's Manual, NEHS0685, "Information Drop-Down Menu Functions" for further information.

10. Select the "<Temporary Group>" and press the "OK" button.

11. The Lift Link Position is displayed. The display should read 90 ± 1 degrees. Record the Lift Link Position reading.

12. If the Lift Link Position is not 90 ± 1 degrees, perform the following steps to the lift linkage position sensor mounted on the loader frame:

a. Loosen bolt (3).

b. While holding lever (2), rotate shaft (1) until the Lift Link Position reads 90 ± 1 degrees.

c. Tighten bolt (3).

Show/hide table

NOTICE
If the position sensor is extended beyond maximum limits, damage to the sensor will occur.

13. Start the engine. Raise the lift arms slowly to the fully raised position while observing the Lift Link Position reading. The display should read 10 ± 1 degrees with the lift arms in the fully raised position.

14. Return the lift arms to the full lower position. The Lift Link Position reading should return to the reading in Step 10.

15. Exit from the ET software program.

Position Sensor (Tilt Linkage) - Adjust

SMCS Code: 5736-025-T2

1. Engage the parking brake. Lower the bucket to the ground. Put blocks in front of and behind the wheels.

2. Install the steering frame lock pin so the machine can not turn.

3. Stop the engine.

4. Remove cover (1) to access the tilt linkage position sensor.

5. Start the engine and put the bucket in the full tilted back position.

6. Place support blocks under the bucket so the bucket will not move.

7. Stop the engine.

Tilt Linkage Position Sensor Lever Initial Adjustment

(2) Bolt.

(3) Shaft.

(4) Lever.

8. If the tilt linkage position sensor is to be installed on the tilt cylinder rod before adjusting the position sensor, perform the following steps.

a. Install lever (4) on position sensor assembly shaft (3). Rotate lever (4) until dimensions (A) and (B) are achieved. Refer to the table that follows:

b. Tighten lever locking bolt (2).

Tilt Linkage Position Sensor

(5) Tilt linkage position sensor assembly.

(6) Tilt cylinder rod.

c. Install the tilt linkage position sensor assembly (5) on tilt cylinder rod (6) as shown.

9. Connect the Caterpillar Electronic Technician (ET) to the ET service port in the cab of the machine being serviced.

10. Turn the engine start switch to the ON position, but do not start the engine.

11. Start the ET software and select "Autodig" from the "Available ECMs" dialog box on the "ECM Summary" display.

12. Select the "Status Tool" icon from the toolbar.

13. Create a "<Temporary Group>" which includes the "Autodig LHD Tilt Link Position" parameter. Refer to Caterpillar Service Tool Software/User's Manual, NEHS0685, "Information Drop-Down Menu Functions" for further information.

14. Select the "<Temporary Group>" and press the "OK" button.

15. The Tilt Link Position is displayed. The display should read 10 ± 1 degrees. Record the Tilt Link Position reading.

16. If the Tilt Link Position is not 10 ± 1 degrees, perform the following steps to the tilt linkage position sensor mounted on the tilt cylinder rod:

a. Loosen bolt (2).

b. While holding lever (4), rotate shaft (3) until the Tilt Link Position reads 10 ± 1 degrees.

c. Tighten bolt (2).

Show/hide table

NOTICE
If the position sensor is extended beyond maximum limits, damage to the sensor will occur.

17. Start the engine. Raise the lift arms to the fully raised position then slowly move the bucket to the full dump position while observing the Tilt Link Position reading. The display should read 90 ± 1 degrees with the lift arms in the fully dumped position.

18. Return the bucket to the full tilt back position. The Tilt Link Position reading should return to the reading in Step 15.

19. Lower the bucket to the ground.

20. Exit from the ET software program.

Speed Sensor - Adjust

SMCS Code: 1907-025; 3141-025; 3175-025

Speed Sensor

(1) Air gap.

(2) Locknut.

1. Remove the speed sensor. Align a gear tooth directly in the center of the threaded sensor opening.

2. By hand, screw the sensor into the hole until the end of the sensor just makes contact with the gear tooth.

3. Turn the sensor back out 1/2 turn (180° in the counterclockwise direction).

4. Tighten locknut (2) to 13 ± 1 N·m (115 ± 9 lb in).

NOTE: Do not allow the sensor to turn as locknut (2) is tightened.

Electronic Control Module (ECM) - Replace

SMCS Code:5702-510-AU; 5741-510-AU

Prior to replacement of the ECM, ensure that replacement is absolutely necessary. Seldom is an ECM the cause of a fault. Always check to ensure that power is available to the ECM. The system voltage is required at the Autodig ECM connector J1 contact 58 and connector J2 contact 70.

1. Turn the battery disconnect switch and the engine start switch to the OFF position.

2. Remove the ECM from the machine.

3. Disconnect the machine harness from the ECM.

4. Make sure the replacement ECM has the correct part number.

5. Connect the machine harness to the ECM.

6. Install the replacement ECM.

7. Turn the battery disconnect switch and the engine start switch to the ON position.

8. Perform the calibration of the linkage position sensors.

Reference: For more information on calibration, refer to Systems Operation, Testing and Adjusting, "Position Sensor (Lift Linkage and Tilt Linkage) - Calibrate" for the machine that is being serviced.

9. After verifying that the fault symptom disappears, refit the original ECM and confirm that the fault reappears.

Glossary of Terms

SMCS Code: 5741

Abnormal

This means a condition that is not normal. The presence of an abnormal condition or an abnormal signal indicates the existence of a problem. A warning is activated in order to alert the operator.

Active

This pertains to the status of a fault or to the status of a service code. When the fault is active, the fault is currently present.

Ampere

Amperes are the unit of measure for the flow of electrical current in a circuit.

+Battery

+Battery refers to any of the harness wiring which is part of the circuit that connects to the positive battery post.

Calibration

Calibration is an electronic adjustment of a sensor signal.

Cat Data Link

The Cat data link is an electrical connection for communication with onboard devices that use the Data Link (ECM, CMS, VIMS, electronic power train, electronic dashboards and service tools such as Caterpillar Electronic Technician). The Cat data link is also the medium that is used for programming with Caterpillar service tools and for troubleshooting with Caterpillar service tools.

Caterpillar Electronic Technician (ET)

This is a diagnostic service tool for a personal computer (PC).

Circuit

A circuit is a continuous path along a conductor for the flow of electrical current. A circuit goes from an electrical source, through various components, and back to the electrical source.

Clear

Clear refers to removing diagnostic information from the memory of the ECM. Before clearing a fault, it is necessary that the fault is on-hold and that the fault is not present.

CMS

The Caterpillar Monitoring System.

Code

See "Diagnostic Code".

Component Identifier (CID)

The CID is a diagnostic code that tells which component or system is faulty. For example; isolation switch, speed sensor or pilot pressure switch. The CID is a three digit code that is shown on the CMS display when in normal or service mode.

Communication Adapter

The communication adapter provides a communication link between the ECM and ET. The adapter converts Cat data link communication to RS-232 communication or to ATA data link communication and vice versa.

Connector Contact

A connector contact is the component of a harness connector that actually makes the electrical connection. Connector contacts are either pins or sockets.

Data Link

See "Cat data link".

Detected Fault

A detected fault is a fault that has been found by the ECM. The fault is recorded and diagnostic information is available when in service mode.

Diagnostic

Diagnostic refers to the showing, monitoring and/or recording of information other than normal. Diagnostic information is available when in all display modes.

Diagnostic Code

This is a code which describes a problem in a system.

Digital Sensors

Digital sensors produce PWM signal (duty cycle signal). These sensors are powered from a power supply of 8 to 28 DCV. The following digital sensors are used; linkage position sensors.

Digital Signal

This signal is a PWM signal (duty cycle) that has a variable width and a constant amplitude. Also see "Pulse Width Modulation (PWM)".

Display

Display refers to the readout and indicators that are visible through the window of the CMS.

Duty Cycle

See "Pulse Width Modulation (PWM)".

ET (Electronic Technician)

A service tool used to help diagnose electronic control systems.

Fault

A fault is a failure of a component of the Autodig electronic control system. The ECM detects a fault when a signal at the ECM connector is outside a valid range. For example; open or shorted harness, faulty switch, or faulty sensor. The corresponding CID and FMI for a detected fault is shown on the display of the CMS.

Flash Programming

This is a means of reprogramming the personality module in the ECM without needing to replace the module.

FMI (Failure Mode Identifier)

The FMI is a diagnostic code that tells what type of failure has occurred. For example; voltage above normal, current below normal or abnormal frequency. The FMI is a two digit code preceded by a decimal point (.). This code can be shown on the CMS display when in normal or service mode.

Fuse

A fuse is a replaceable safety device for an electrical circuit.

Ground

A ground is any part of a wiring circuit that accidentally touches a part of the machine frame.

Grounded Circuit

A grounded circuit is a connection of any electrical unit to any part of the machine. In a grounded circuit, the electrical circuit is completed to the power source.

Harness

A harness is the bundle of wiring that connects components in the system.

Harness Code

The harness code provides the characteristics of the machine such as the size of the engine, idle speed, tire size and attachments. The Caterpillar Monitoring System uses the data link to provide the harness code to the Autodig ECM.

Hertz (Hz)

Hz is a measurement of frequency in cycles per second.

Hold or On Hold

This pertains to the holding of diagnostic information that is shown in the display area when in the service mode. It is necessary to hold the set of diagnostic information before troubleshooting or clearing.

Jumper

A jumper is a piece of wire that is used to make an electrical connection during troubleshooting.

Machine Service Connector

This is a socket that is used to connect a service tool to the onboard electronic systems such as the Autodig ECM or the power train ECM. The machine service connector is mounted on the machine and the CAT data link is used for the connection.

Magnetic Pickup

The magnetic pickup consists of a permanent magnet, a pole piece and a pickup coil. An electrical pulse is generated whenever a gear tooth interrupts the magnetic field.

Module Identifier (MID)

An MID is a diagnostic code that identifies the ECM which diagnosed the fault. The three-digit code is displayed in the message area of the message display when the machine is in the service mode. The MID No. for the Autodig control is 082.

Ohm

An ohm is the standard unit for measuring resistance to the flow of electrical current.

Open Circuit

If an electrical wire or a connection is broken, the flow of electrical current through the circuit is interrupted.

Plug (connector)

A plug is a fitting for making an electrical connection to a circuit. Insert the plug into a receptacle or into the body of electrical equipment.

Present

This pertains to the status of a fault or to the status of a service code. When a fault is present, the fault is currently active.

Pulse Width Modulation (PWM)

The PWM is a signal that consists of variable pulse widths at fixed intervals. The duty cycle can be varied.

Receptacle (connector)

A receptacle is an electrical fitting that receives the plug assembly in an electrical circuit.

Scroll

Scrolling is the process of showing (within the digital display area) all available sets of diagnostic information, one set at a time. A set of diagnostic information is shown briefly and then the display automatically advances to the next set. After all sets are shown the display shows "End" and then the sets are repeated.

Sensor

A sensor is a device that measures conditions such as pressure, temperature, or movement. This information is sent as an electrical signal that can be interpreted by the ECM.

Service Code

A code which describes a condition (sometimes a problem) in an electronic control system. This code is stored in the ECM for the service technician.

Service Tool Connector

See "Machine Service Connector".

Short Circuit

If one part of a circuit contacts another part of the same circuit, the flow is diverted from the desired path.

Signal

Signal refers to the condition of the ECM inputs. The types of signal:

* A ground signal has continuity with frame ground.

* An open signal is not connected to frame ground; the voltage level is approximately 5 DCV.

* A +battery signal is at the same voltage level as the voltage of the battery; between 25 and 30 DCV.

Signal Wire

The signal wire is the harness wire which connects the sensor or switch to the ECM.

Solenoid

A solenoid is a coil that is used to produce a magnetic field. The solenoid usually performs some type of mechanical work.

Supply Voltage

Supply voltage is a constant voltage that is supplied to a component in order to provide electrical power for the operation of the component. Supply voltage may be generated by the ECM. Also, supply voltage may be battery voltage that is supplied by machine wiring.

Switch Input

A switch input is any input of the ECM which is expecting a grounded, open or +battery signal.

System Voltage

System voltage is the actual voltage that exists between the positive battery post and frame ground. System voltage is also referred to as +battery voltage.

Undetected Fault

An undetected fault is a fault that exists and is not found by the ECM, but is found by the operator or service person.

+V

+V is a constant voltage that is supplied to a component to provide electrical power for its operation. +V is provided by an electronic control module or the battery.

Wiring Harness

A wiring harness is the bundle of individual wires that form an electrical circuit.

Electrical System Schematic

SMCS Code: 1400; 5741

This is a simplified electrical system schematic of the R1700G Autodig system. The schematic is electrically correct, but does not show all possible harness connectors. Refer to the Service Manual, "Electrical Schematic" for an accurate electrical schematic for the machine that is being serviced.