Usage:
General Information
SMCS Code: 5741
Autodig Electronic Control System Block Diagram
Autodig System - Typical Cab Dash Panel
The Autodig system is an electronic control system that automatically loads the bucket of a Load Haul Dump (LHD) machine after the operator has activated the system. The machine has to be traveling towards a stockpile with the bucket near the ground and nearly level. The Autodig system is activated by an operator in the cab or by an operator using the optional remote control system.
The main component in the Autodig system is the Autodig electronic control module (ECM). The Autodig ECM receives information from switches activated by the operator, from sensors connected to the machine implement hydraulic system, the power train, and from position sensors connected to the bucket control. This information is used by the Autodig ECM to determine different bucket loading characteristics, loading aggressiveness levels and the position of the machine's bucket. The Autodig ECM then activates solenoids that control the machine's implement hydraulic system to load the machine's bucket.
Autodig Electronic Control System
SMCS Code: 5471
Autodig System Hydraulic Schematic
The Autodig system consists of the following systems: the Autodig electronic control system, the machine implement hydraulic system and the optional remote control system.
The Autodig electronic control system consists of the following components: lift and tilt cylinder oil pressure sensors (1), bucket control valve (11), lift and tilt pilot pressure switches (20), Autodig electronic control module (ECM) (30), engine start switch (31), isolation switch (32), logic control module (33), mode selection switch (34), enable switch (36), indicator lamp (cab) (37), indicator light (hood) (38), implement solenoid ground interrupt relay (41), engine speed sensor (42), torque converter output speed sensor (43), transmission output speed sensor (43), transmission output speed sensor (44), lift linkage position sensor (45), tilt linkage position sensor (46) and horn (Autodig) (47).
The Autodig system utilizes various components of the machine implement hydraulic system.
When the optional remote control system is fitted to the machine the following components are included in the Autodig system: remote control directional control valve (12), remote control switch (35), remote control receiver (39), remote control interface logic box (40) and the remote control transmitter (not shown).
Operation - Autodig OFF
When isolation switch (32) is in the OFF position, Autodig electronic control module (ECM) (30) reads implement control signals from the remote control system (if equipped) and controls the appropriate implement solenoid control valves (28). All other functions from the remote control system are handled manually by the operator.
Operation - Autodig ON
Operation of the Autodig system from the cab is the same as using the Autodig system on remote control. In order to operate the Autodig system on remote control, remote control switch (35) in the cab has to be in the ON position. Refer to Systems Operation, "Remote Control System" for information on Autodig transmitter controls.
With the engine running and isolation switch (32) in the ON position, the Autodig system is ready to start an Autodig cycle. When the operator presses enable switch (36) on the pilot control valve, Autodig ECM (30) will illuminate indicator lamp (37) and indicator light (38). The operator must press enable switch (36) to start a new Autodig cycle. The operator should press the enable switch while driving the machine toward the stockpile.
The Autodig ECM will begin a check of conditions to determine whether to initiate an Autodig cycle. The conditions that must be met are as follows:
- * The bucket is on or near the ground.
- * The bucket is nearly level.
- * The transmission is in a forward gear.
- * The engine is near high idle.
- * Pilot control valve (29) is centered (less than 20 percent of travel).
- * The machine has not executed a directional shift in the last 1.5 seconds.
- * The bucket is nearly level.
If one of the above conditions is not met the Autodig ECM will not initiated an Autodig cycle.
If there is an active fault in the Autodig system when the operator turns the isolation switch (32) to the ON position, indicator lamp (37) to the ON position, indicator lamp (37) and indicator light (38) will flash. This indicates to the operator that there is a fault and that the Autodig system has been disabled.
The Autodig ECM will disable an Autodig cycle and control of the bucket will return to the operator if any of the following conditions occur:
- * Pilot control valve (29) is moved (more than 20 percent of travel).
- * The enable switch is pressed again.
- * A fault is detected on one of the inputs or outputs.
- * The enable switch is pressed again.
Once the Autodig ECM determines that all of the conditions have been met, the ECM will monitor several inputs to determine when the bucket has contacted the stockpile. When the stockpile has been contacted, the ECM will sound Autodig horn (47) once.
The Autodig ECM will then execute whichever Autodig mode that has been determined by the dash panel mounted mode selection switch (34). When the Autodig cycle is complete the indicator lamp and indicator light will turn OFF and the Autodig horn will sound once to signal the completion of the Autodig cycle. The operator should resume manual control of the machines bucket.
Reference: For information on the operation of the hydraulic system, refer to Systems Operation, Testing and Adjusting, "Bucket Control Valve" for the machine that is being serviced.
Autodig Electronic Control Module (ECM)
SMCS Code: 5702-AU
Autodig Electronic Control System Diagram
Location of Autodig Electronic Control Module
Autodig Electronic Control Module (ECM)
The Autodig ECM makes decisions based on the input information and the memory information. After the Autodig ECM receives input information, the Autodig ECM sends a corresponding response out through the outputs. The inputs and outputs of the Autodig ECM are connected to the machine harness by two 70 contact connectors (J1 and J2).
Inputs
Numerous inputs inform the Autodig ECM of the operating conditions of the machine. Three types of inputs provide information to the Autodig ECM, operational, sensor and remote control. The inputs are listed on the Contact Description table in this section.
Operational
The operational inputs provide information about operator requests to the control. These inputs receive information about the Autodig system ON/OFF, mode selection, implement (from the remote control) and implement override of the Autodig system. These switches provide an open (floating), ground or +battery signal to the inputs of the Autodig ECM.
Sensor
Two types of sensors are used.
An AC signal which represents:
- * Engine speed.
- * Torque converter output speed.
- * Transmission output speed.
- * Lift cylinder head end pressure.
- * Lift cylinder rod end pressure.
- * Tilt cylinder head end pressure.
- * Tilt cylinder rod end pressure.
- * Torque converter output speed.
A pulse width modulated (PWM) signal which represents:
- * Lift linkage position.
- * Tilt linkage position.
Remote Control
The Autodig ECM reads inputs from the Elphinstone remote control system. These include the remote control switch in the cab, the Autodig enable switch and the four implement commands for tilt back, dump, raise and lower the remote control receiver via the interface logic box.
The implement commands for tilt back, dump, raise and lower are pulse width modulated (PWM) signals that can be read by the Autodig ECM.
Outputs
The Autodig ECM responds to decisions by sending electrical signals through the various outputs. There are two types of output produced by the Autodig ECM; solenoids and indicators. The outputs are listed on the Contact Description table in this section.
Solenoid
The Autodig ECM sends a signal to the solenoid outputs to energize solenoids that control the machine's lift, lower, tilt back and dump functions.
Indicator
The Autodig ECM provides information on the status of the Autodig system to the operator, including Autodig system activated and pile contacted.
Input/Output
The CAT data link is used to communicate with other electronic control modules on the machine. The data link is bidirectional, which allows the Autodig ECM to receive and send information. However, in this application the Autodig ECM only supports reprogramming via the CAT datalink. A supports reprogramming via the CAT datalink. A personal computer using Electronic Technician software is used to program and troubleshoot the Autodig ECM.
All electronic controls that use the data link are assigned a module identifier (MID). The MID for the Autodig ECM is the number 082.
Contact Description of Autodig Electronic Control Connectors J1 and J2
Switches
SMCS Code: 5741-ZS
Switches provide an open, ground or +battery signal to the switch type inputs of the Autodig ECM. Switches are two state devices; either open or closed.
- * When a switch is open, no signal is provided to the corresponding input of the Autodig ECM.
- * When a switch is closed, either a ground signal or +battery signal is provided to the corresponding input of the Autodig ECM.
Reference: For more information on the Autodig system switches, refer to the Electrical Schematic Supplement for the machine that is being serviced.
Engine Start Switch
Engine Start Switch
The engine start switch is an input to the Autodig ECM. The switch is a three position key start switch. One of the purposes of the switch is to provide battery power to the Autodig ECM. When the engine start switch is turned to the ON position the switch energizes the main power relay which in turn closes and connects +battery to connector J1 contact 58 and connector J2 contact 70 of the Autodig ECM. When the switch is turned to the OFF position the main power relay de-energizes and opens to disconnect the Autodig ECM from +battery.
Isolation Switch
Isolation Switch
The isolation switch is an input to the Autodig ECM. The switch is a three position key start switch. However, in this application it is utilized as a two position switch. The purpose of the switch is to isolate the Autodig system. When the switch is in the ON position the switch closes connector J1 contact 31 of the control to ground. In this position full functionality of the Autodig system is possible, it can be enabled from the cab or from the Elphinstone remote control system (if equipped). When the switch is in the OFF position the switch closes connector J1 contact 30 of the control to ground. In this position it is not possible to enable the Autodig system from either the cab or the Elphinstone remote control system, but manual control of the bucket control valve solenoids is still possible from the Elphinstone remote control system.
NOTE: The two circuits (N/C and N/O) for the isolation switch are used for diagnostic purposes. If the two circuits are ever in the same state (open or grounded), the Autodig ECM knows a circuit failure is present. This fault is then shown on the display of the Caterpillar Monitoring System.
Reference: For further information, refer to Systems Operation, Testing and Adjusting, "Diagnostic Operation" for the machine that is being serviced.
Mode Selection Switch
Mode Selection Switch
The purpose of the mode selection switch is to tell the Autodig ECM which environment condition (mode (1, 2, 3 or 4) the operator wants the ECM to operate.
The mode selection switch is a four position switch. The switch has four input connections to the Autodig logic control box.
The valid Autodig logic control module input combinations for each switch position are shown in the table that follows. If an invalid input combination is detected by the Autodig ECM, the ECM knows a circuit failure is present. This fault is then shown on the display of the Caterpillar Monitoring System.
Reference: For further information, refer to Systems Operation, Testing and Adjusting, "Diagnostic Operation" for the machine that is being serviced.
G = Grounded, O = Open
Logic Control Module
Location of the Logic Control Module - Typical Example
The logic control module is factory set to optimise Autodig performance in typical underground applications.
NOTE: Changes to this module may result in poor Autodig performance.
Logic Control Module
Enable Switch
Location of the Enable Switch
Enable Switch
Enable switch (1) is located on the right side on the top of joystick control lever (2).
The enable switch has an input connection to the Autodig ECM at connector J1 contact 28. The enable switch is normally open but is momentarily closed when the operator presses and releases the switch. The Autodig ECM reads this input and when it detects that the enable switch has been closed, the Autodig ECM activates an Autodig cycle if it's currently inactive or deactivates an Autodig cycle if it's currently active.
NOTE: A fault will be logged if the enable switch is held on for more than 10 seconds - regardless of the Autodig isolation switch status.
Pilot Oil Pressure Switches
Location of Pilot Oil Pressure Switches
Lift, Lower, Tilt Back and Dump Pilot Oil Pressure Switch
The lift, lower, dump and tilt back pilot oil pressure switches are inputs of the Autodig ECM. When the operator moves the hydraulic control lever to either the LIFT, LOWER, TILT BACK or DUMP position, a signal is sent to the Autodig ECM. The purpose of the switches is to tell the ECM when the joystick control lever has been moved from the HOLD position and that the operator is cancelling an Autodig cycle. The joystick control lever has to be moved past 20 percent of the control lever travel to cancel a cycle.
The lift, lower, tilt back and dump pilot oil pressure switches are single pole, double throw pressure switches. When the operator moves the joystick control lever to either the LIFT, LOWER, TILT BACK or DUMP position the normally closed (N/C) contact opens and the normally open (N/O) contact closes to ground.
The lift pilot oil pressure switch connects to connector J1 contacts 36 and 37. Lower pilot oil pressure switch connects to connector J1 contacts 38 and 39. Tilt back pilot oil pressure switch connects to connector J1 contacts 44 and 45. Dump pilot oil pressure switch connects to connector J1 contacts 46 and 47.
NOTE: Two circuits (N/C and N/O) for the pilot oil pressure switches are used for diagnostic purposes. If the two circuits are ever in the same state (open or grounded), the ECM knows a circuit failure is present. This fault is then shown on the display of the Caterpillar Monitoring System.
Reference: For further information, refer to this Systems Operation, Testing and Adjusting, "Diagnostic Operation" for the machine that is being serviced.
Sensors
SMCS Code: 5741-NS
General Information
Sensors provide information (input) to the Autodig ECM about changing conditions, such as engine speed, torque converter output speed, transmission output speed, lift and tilt cylinder pressures (head and rod), lift linkage position and tilt linkage position. The type of sensor signals that the Autodig ECM recognizes are:
- * Frequency - The sensor produces an AC signal in which the frequency (Hz) varies as the condition changes.
- * Pulse width modulated (PWM) - The sensor produces a digital signal in which the duty cycle varies as the signal changes. The frequency of this signal is constant.
Frequency Sensors
Frequency sensors produce a signal (sine wave) in which the frequency (Hz) varies as the condition changes.
Speed Sensor
Location of Engine Speed Sensor
Location of Torque Converter Output Speed Sensor
Location of Transmission Output Speed Sensor
Engine Speed, Torque Converter Output Speed and Transmission Output Speed Sensors
The engine speed sensor, torque converter output speed sensor and the transmission output speed sensor are inputs of the Autodig ECM. These sensors allow the Autodig ECM to determine the engine, torque converter and transmission speed. The Autodig ECM uses this information to make control decisions.
The engine speed sensor, torque converter output speed sensor and the transmission output speed sensor are used to measure engine RPM, torque converter output RPM and transmission output RPM. The speed sensors are frequency sensors that produce a signal in which the frequency (Hz) varies as the condition changes. These sensors generate a sine wave signal, from passing gear teeth, which is sent to the Autodig ECM. The Autodig ECM measures the signal frequency (one pulse per gear tooth) to determine the engine speed, torque converter output speed and transmission output speed. The engine speed sensor connects to connector J1 contacts 67 and 68 of the Autodig ECM. The torque converter output speed sensor connects to connector J1 contacts 40 and 41 of the ECM. The transmission output speed sensor connects to connector J1 contacts 32 and 33 of the ECM.
Implement Oil Pressure Sensor
Location of Lift Cylinder and Tilt Cylinder Oil Pressure Sensors
Lift Cylinder and Tilt Cylinder Oil Pressure Sensors
The lift cylinder and tilt cylinder oil pressure sensors react to the pressure in the head end and rod end of the lift and tilt cylinders. The sensor receives operating power from the machine electrical system. The sensor sends the Autodig ECM a square wave signal that varies in frequency as the cylinder pressure changes. The Autodig ECM measures the frequency to determine the pressure in the lift and tilt cylinders. These sensors do not need calibration.
Pulse Width Modulated (PWM) Sensors
Pulse Width Modulated Signal
Typical PWM Sensor Schematic
Pulse width modulated (PWM) sensors produce a digital signal in which the duty cycle varies as the condition changes. The frequency remains constant.
Linkage Position Sensor
Location of Lift Linkage Position Sensor
Location of Tilt Linkage Position Sensor
Typical Position Sensor and Schematic
The lift linkage position sensor and the tilt linkage position sensor are inputs of the Autodig ECM. The purpose of the sensors is to continuously tell the ECM the position of the lift arm and the tilt linkages. The lift linkage position sensor is mounted on the front frame at the machines' lift arm pivot. The tilt linkage position sensor is mounted on the tilt cylinder rod. The ECM changes the lift arm and tilt linkage position by activating the implement solenoid control valves, based on the position of the lift and tilt linkage position sensors.
Both sensors are a Pulse Width Modulated (PWM) type of sensor that operate on the machines' system voltage. The frequency (Hz) of this signal is 500 Hz and will remain constant. This sensor continuously generates a PWM signal with the duty cycle of the sensor varying in proportion to the angle of the lift arm or the tilt linkage. The ECM receives the PWM signal and measures the duty cycle to determine the position of the lift arm or tilt linkage. The angle of the lift and tilt linkage position sensors is displayed on Electronic Technician (ET) software in degrees.
NOTE: The lift linkage position sensor and the tilt linkage position sensor are the only sensors that must be calibrated.
Reference: For more information on 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.
Solenoid Control Valves
SMCS Code: 5479-ZM
Solenoid Control Valves
Solenoid Control Valve
Four solenoid control valves (2) are part of bucket control valve (3). The solenoid control valves control the lift, lower, tilt back and dump functions of the machine. The solenoid control valves are cartridge-type valves.
NOTE: A solenoid operated directional control valve (1) is attached to the bucket control valve when the optional Elphinstone remote control system is fitted. The directional control valve controls the remote control system steering functions.
Reference: For more information on the Elphinstone remote control system, refer to this Systems Operation, Testing and Adjusting, "Remote Control System" for the machine that is being serviced.
The solenoid control valves are connected to the machine hydraulic system through ports in the manifold assembly of the bucket control valve.
During an Autodig cycle the Autodig ECM energizes as required the appropriate solenoid control valve to control the machines tilt back, dump, lift and lower functions. When energized the solenoid control valve directs pilot oil to the main implement control valve. The main implement control valve allows pressurized oil to the lift and tilt cylinders.
Indicators
SMCS Code: 5741; 7431
The indicators for the Autodig system notify the operator of the status of the Autodig system.
Indicators for the Autodig system are the indicator lamp, indicator light and horn.
Indicator Lamp
Location of Indicator Lamp
Indicator Lamp
The indicator lamp is an output of the Autodig ECM. The indicator lamp is part of the dash warning lamp panel. The indicator lamp turns ON to alert the operator that the enable switch has been depressed and the Autodig system has been enabled. The indicator lamp will turn OFF when an Autodig cycle has been completed or an Autodig cycle has been cancelled.
The indicator lamp will flash continuously when a fault in the Autodig system has been detected - regardless of the Autodig isolation switch status.
Indicator Light
Location of Indicator Light
Indicator Light
The indicator light is an output of the Autodig ECM. The indicator light provides a visual indicator to the operator. The indicator light turns ON to alert the operator that the enable switch has been depressed and the Autodig system has been enabled. The indicator light will turn OFF when an Autodig cycle has been completed or an Autodig cycle has been cancelled.
The indicator light will flash continuously when an active fault in the Autodig system has been detected, and the Autodig isolation switch is in the ON position.
Horn
Location of Horn
Horn
The Autodig horn is an output of the Autodig ECM. The Autodig horn provides an audible signal to the operator. 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.
NOTE: The Autodig ECM does not diagnose faults on the Autodig horn circuit.
Reference: For more information on troubleshooting the horn circuit, refer to Systems Operation, Testing and Adjusting, "Troubleshooting Faults without Service Codes" for the machine that is being serviced.
Implement Solenoid Ground Interrupt Relay
SMCS Code: 5741-R7
Location of Implement Solenoid Ground Interrupt Relay
Implement Solenoid Ground Interrupt Relay
The implement solenoid ground interrupt relay prevents unwanted bucket control linkage movement when a short to battery fault is detected on any of the implement solenoid control valves.
The relay has normally open contacts. During Autodig system operation the Autodig ECM energizes the relay coil, closing the contacts and connecting the solenoid control valve ground wires to the solenoid return of the Autodig ECM. When the Autodig ECM detects a short to battery fault on any of the implement solenoid circuits, the ECM de-energizes the relay coil. This causes the contacts to open and interrupts the ground circuit for all of the implement solenoid control valves. The solenoid control valves shut and stop pilot oil flow to the main implement control valve.
The Autodig ECM has an output connection to the relay; connector J2 contact 45 at relay contact 86. The ground wires for the implement solenoids are connected at relay contact 87. The relay has two return connections to the Autodig ECM; relay contact 30 at connector J2 contact 52 and relay contact 85 at connector J2 contact 36.
CAT Data Link
SMCS Code: 5741; 7490
The CAT data link is an input and an output of the Autodig ECM at connector J1 contacts 7 and 8. The purpose of the data link is to communicate with other electronic control modules, such as the Caterpillar Monitoring System. It also communicates with the ET service tool. The data link is not a visible component, it consists of internal control circuits and the connecting harness wiring. The data link is bidirectional. However, in this application the Autodig ECM only supports reprogramming and troubleshooting which allows the Autodig ECM to receive and send information.
The Autodig ECM sends information via the CAT data link. The information sent is:
- * Diagnostic service codes - shown on the Caterpillar Monitoring System.
- * Additional information is available for use by the ET service tool.
All electronic controls that use the CAT data link have a module identifier (MID). The MID for the Autodig ECM is the number 082.
Caterpillar Monitoring System
SMCS Code: 7490
Main Display Module of Caterpillar Monitoring System
Caterpillar Monitoring System is an output of the Autodig ECM. The Caterpillar Monitoring System receives information from the Autodig ECM and shows the following information regarding the Autodig system:
- * Diagnostic service codes shown on display area (1).
Remote Control System
SMCS Code: 7600-ZM
The remote control system consists of the following main components: remote control switch, transmitter, receiver, interface logic box, and the machine electrical and hydraulic interface components.
The remote control system is an input of the Autodig ECM when fitted to a machine. The Autodig ECM is in series with the remote control interface logic box. When the Autodig isolation switch is in the OFF position, the Autodig ECM still reads implement signals from the remote control system to power the appropriate implement solenoid valves. All other functions from the remote control system are handled manually by the operator.
Remote Control Switch
Remote Control Switch
The remote control switch is used to supply power to the remote control receiver and the interface logic box.
The Autodig ECM has an input from the remote control switch. The input to connector J2 contact 30 tells the Autodig ECM that the machine is in remote control mode. When the remote control switch is in the OFF position, the Autodig ECM disables diagnostics for the remote control implement inputs.
Reference: For more information on the operation of the remote control system, refer to Operation and Maintenance Manual, "Remote Control Operation" for the machine that is being serviced.
Transmitter
Remote Control Transmitter
Enable Switch
Remote control Autodig enable switch (2) is located on the top of bucket control lever (1).
The remote control enable switch has an input to the Autodig ECM connector J2 contact 31. The switch is normally open but is momentarily closed when the operator presses and releases the switch. The Autodig ECM reads this input and when it detects that the enable switch has been closed, the Autodig ECM activates an Autodig cycle if it's currently inactive or deactivates an Autodig cycle if it's currently active.
NOTE: A fault will be logged if the enable switch is held on for more than 10 seconds - regardless of the Autodig isolation switch status.
Bucket Control Lever
Bucket control lever (1) is connected to four sensors in the transmitter. When the operator moves the bucket control lever to either the LIFT, LOWER, TILT BACK or DUMP position, a signal is sent to the Autodig ECM. The purpose of the sensors is to tell the ECM when the bucket control lever has been moved from the HOLD position. This causes the Autodig ECM to disable the Autodig cycle.
The bucket control lever has four input connections to the Autodig ECM; the lift function at connector J1 contact 15, lower function at connector J1 contact 16, dump function at connector J1 contact 17, and tilt back function at connector J1 contact 26.
Receiver
Location of Receiver and Interface Logic Box
Receiver (3) receives and interprets a radio signal from the remote control transmitter. The receiver then sends an electrical signal to remote control interface logic box (4).
Interface Logic Box
The function of the interface logic box is to provide a connection or interface between the remote control system and the machine.
Interface logic box (4) inputs a signal from receiver (3). The output from the interface logic box is to the Autodig ECM and then to the solenoid control valves.
Bucket Control Valve
SMCS Code: 5479-ZM
Autodig System Hydraulic Schematic
The Autodig ECM controls the machine bucket functions via bucket control valve (11).
Bucket control valve (11) contains four solenoid control valves (28) mounted in a manifold. There is a solenoid control valve for each of the LIFT, LOWER, TILT BACK and DUMP functions. The solenoid control valves control the machine bucket functions. The solenoid control valves are supplied pilot pressure oil from the machine hydraulic system.
A shuttle valve (27) for each bucket function is located in the manifold of bucket control valve (11). Pilot oil lines from pilot control valve (29) are connected to the manifold of bucket control valve (11). When the pilot control valve is used for a bucket function, pilot pressure oil is directed to the manifold. The shuttle valve for that function directs the pilot pressure oil to main implement control valve (4) in the loader frame.
When Autodig ECM (30) energizes lift solenoid control valve (28), the valve directs pilot pressure oil to shuttle valve (27) in bucket control valve manifold (11). Shuttle valve (27) blocks oil from going to pilot control valve (29) and directs oil to main implement control valve (4). The pilot oil moves lift control valve spool (8) to the LIFT position to lift the bucket.
When Autodig ECM (30) de-energizes the lift solenoid control valve, the valve allows the pilot oil from the main implement control valve to return to hydraulic tank (18) through shuttle valve (27). Lift control spool (8) in main implement control valve (4) is moved to the HOLD position by spring force and the bucket remains stationary.
The operation of the other bucket functions is the same as the LIFT function.
Reference: For further information on the hydraulic system, refer to the Hydraulic System, Systems Operation, Testing and Adjusting for the machine that is being serviced.
Diagnostic Operation
SMCS Code: 5741; 7490
The Autodig ECM detects faults that occur in most of the input and output circuits. A fault is detected when the signal (at the contact of the Autodig ECM) is outside a valid range. The Autodig ECM then records the fault. If the fault goes away (not present), the fault information remains stored for future reference.
The diagnostics of the Autodig ECM are available to assist with the troubleshooting of detected faults. A service code is used to specify each detected fault. The service code consists of three identifiers (MID, CID and FMI). The service code is shown in the display area of the Caterpillar Monitoring System. The identifiers are:
Module Identifier (MID) - The MID is a three digit code shown on the display area. The MID displays for approximately one second before the service code is shown in the same area. The MID identifies which electronic control diagnosed the fault. Some MID's are:
- Caterpillar Monitoring System 030
- Autodig ECM 082
NOTE: The MID of the Autodig ECM is 082. When troubleshooting the Autodig system, make sure the number 082 precedes the service code of the fault. The Caterpillar Monitoring System also shows service codes of faults that are not related to the Autodig system. The MID number 082 identifies the service code as coming from the Autodig ECM.
Component Identifier (CID) - The CID tells which component or system is faulty. For example; pressure switch or implement solenoid. The CID is a four digit code shown on the display area. The CID and FMI are displayed together immediately following the MID. A complete list of CID codes for the Autodig ECM is shown in the following table.
Failure Mode Identifier (FMI) - The FMI tells what type of failure has occurred. For example; short to battery, short to ground or abnormal signal. The FMI is a two digit code shown on the display area. The CID and FMI are displayed together immediately following the MID. A decimal point separates the CID and FMI codes.
Reference: For more information on FMI codes for the Autodig ECM, refer to Systems Operation, Testing and Adjusting, "Troubleshooting Faults with Service Codes" for the machine that is being serviced.
The Autodig ECM does not have a display area for showing diagnostic information to service personnel. Diagnostic information concerning the Autodig system is sent on the CAT data link to the Caterpillar Monitoring System. Service personnel must be familiar with the Caterpillar Monitoring System in order to troubleshoot the Autodig system.
The Caterpillar Monitoring System enters service mode when ground is removed from the service and clear inputs while mode number 3 for service mode is shown in the display area. Service mode of the Caterpillar Monitoring System allows service personnel to see and to troubleshoot the faults that the Autodig ECM has detected. While the Caterpillar Monitoring System is in service mode, the service codes for any detected fault of the Autodig system can be scrolled in the display area of the Caterpillar Monitoring System. When the particular fault is displayed, this fault is now 'on-hold' and the display area continuously switches between showing the MID (first display) and then the CID and FMI (second display) of the particular service code.
To scroll through the service codes stored, ground the service input. To clear a service code for a fault on-hold, ground the clear input. The Caterpillar Monitoring System leaves service mode when the service and clear inputs are grounded at the same time.
NOTE: Fault clear and set times can last from less than 1 second up to 60 seconds.
The Autodig ECM will flash the indicator lamp (cab) and the indicator light (hood) when there is a fault present. This will alert personnel to access the diagnostic screen with a service tool. When the lamp and light flash to indicate a fault is present, an Autodig cycle will not execute.
NOTE: A fault in the indicator light (hood) or horn circuit will not prevent the Autodig ECM from executing the Autodig cycle.
Reference: For more information on the Caterpillar Monitoring System, refer to this Systems Operation, Testing and Adjusting, "Caterpillar Monitoring System" for the machine that is being serviced. This Systems Operation, Testing and Adjusting, "Caterpillar Monitoring System" should only be used to display the Autodig system faults.
Calibration
SMCS Code: 5736
If necessary, calibrate the lift linkage position sensor and the tilt linkage position sensor.
Calibration is required when one of the following events occur:
- * Replacement of the Autodig electronic control module.
- * Installation of new Autodig system software.
- * Lift or tilt linkage position sensor is adjusted.
- * Lift or tilt linkage position sensor is replaced.
- * The Autodig ECM logs an "out of calibration" fault code 350-13 or 351-13.
- * Installation of new Autodig system software.
The calibrations are performed by the Autodig ECM in a service mode when the ECM is enabled with the Caterpillar Electronic Technician (ET).
Reference: For more information on calibrating the lift linkage and tilt linkage position sensors, refer to Systems Operation, Testing and Adjusting, "Position Sensor (Lift Linkage and Tilt Linkage) - Calibrate" for the machine that is being serviced.