307.5, 308, 308.5, 309, and 310 Mini Hydraulic Excavator Caterpillar

Sensor Signal (PWM) - Test

Usage:

308 GG8

Machine ECM

The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the PWM sensors of the machine.

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Table 1
Machine ECM (MID 39)
J1939	CDL	Code Description	System Response
	1078-2	Blade Control Lift Position Sensor: Erratic, Intermittent, or Incorrect	All functions are disabled.
	1078-3	Blade Control Lift Position Sensor: Voltage Above Normal	All functions are disabled.
	1078-4	Blade Control Lift Position Sensor: Voltage Below Normal	All functions are disabled.
	1078-8	Blade Control Lift Position Sensor: Abnormal Frequency, Pulse Width, or Period	All functions are disabled.
	1968-2	Boom Cylinder Rod End Press Sensor: Erratic, Intermittent, or Incorrect	When lowering the boom, cylinder operation may be erratic.
	1968-3	Boom Cylinder Rod End Press Sensor: Voltage Above Normal	When lowering the boom, cylinder operation may be erratic.
	1968-4	Boom Cylinder Rod End Press Sensor: Voltage Below Normal	When lowering the boom, cylinder operation may be erratic.
	1968-8	Boom Cylinder Rod End Press Sensor: Abnormal Frequency, Pulse Width, or Period	When lowering the boom, cylinder operation may be erratic.
	1969-2	Boom Cylinder Head End Press Sensor: Erratic, Intermittent, or Incorrect	When lowering the boom, cylinder operation may be erratic.
	1969-3	Boom Cylinder Head End Press Sensor: Voltage Above Normal	When lowering the boom, cylinder operation may be erratic.
	1969-4	Boom Cylinder Head End Press Sensor: Voltage Below Normal	When lowering the boom, cylinder operation may be erratic.
	1969-8	Boom Cylinder Head End Press Sensor: Abnormal Frequency, Pulse Width, or Period	When lowering the boom, cylinder operation may be erratic.
	2263-2	Right Travel Press Sensor: Erratic, Intermittent, or Incorrect	Travel will not operate as requested.
	2263-3	Right Travel Press Sensor: Voltage Above Normal	Travel will not operate as requested.
	2263-4	Right Travel Press Sensor: Voltage Below Normal	Travel will not operate as requested.
	2263-8	Right Travel Press Sensor: Abnormal Frequency, Pulse Width, or Period	Travel will not operate as requested.
	2264-2	Left Travel Pressure Sensor: Erratic, Intermittent, or Incorrect	Travel will not operate as requested.
	2264-3	Left Travel Pressure Sensor: Voltage Above Normal	Travel will not operate as requested.
	2264-4	Left Travel Pressure Sensor: Voltage Below Normal	Travel will not operate as requested.
	2264-8	Left Travel Pressure Sensor: Abnormal Frequency, Pulse Width, or Period	Travel will not operate as requested.
	2474-2	Left Joystick Forward/Reverse Position Sensor: Erratic, Intermittent, or Incorrect	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2474-3	Left Joystick Forward/Reverse Position Sensor:: Voltage Above Normal	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2474-4	Left Joystick Forward/Reverse Position Sensor:: Voltage Below Normal	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2474-8	Left Joystick Forward/Reverse Position Sensor:: Abnormal Frequency, Pulse Width, or Period	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2475-2	Right Joystick Forward/Reverse Position Sensor: Erratic, Intermittent, or Incorrect	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2475-3	Right Joystick Forward/Reverse Position Sensor:: Voltage Above Normal	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2475-4	Right Joystick Forward/Reverse Position Sensor:: Voltage Below Normal	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2475-8	Right Joystick Forward/Reverse Position Sensor:: Abnormal Frequency, Pulse Width, or Period	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2476-2	Left Joystick Left/Right Position Sensor: Erratic, Intermittent, or Incorrect	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2476-3	Left Joystick Left/Right Position Sensor:: Voltage Above Normal	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2476-4	Left Joystick Left/Right Position Sensor:: Voltage Below Normal	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2476-8	Left Joystick Left/Right Position Sensor:: Abnormal Frequency, Pulse Width, or Period	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2477-2	Right Joystick Left/Right Position Sensor: Erratic, Intermittent, or Incorrect	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2477-3	Right Joystick Left/Right Position Sensor:: Voltage Above Normal	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2477-4	Right Joystick Left/Right Position Sensor:: Voltage Below Normal	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2477-8	Right Joystick Left/Right Position Sensor:: Abnormal Frequency, Pulse Width, or Period	The signal for the joystick function is not valid, the signal is not recognized by the ECM.
	2543-3	Joystick Steer Enable Switch:: Voltage Above Normal	When the ECM activates this diagnostic code, the ECM will disable the joystick steering system.
	2543-4	Joystick Steer Enable Switch:: Voltage Below Normal	When the ECM activates this diagnostic code, the ECM will disable the joystick steering system.
	2828-2	Main Hydraulic Pump Press Sensor 1: Erratic, Intermittent, or Incorrect	The Machine ECM will force a shutdown of the machine when this code is active. The Operator Monitor displays a popup symbol in red when this diagnostic code is active. The Operator Monitor Warning LED displays in red when this code is active.
	2828-3	Main Hydraulic Pump Press Sensor 1:: Voltage Above Normal	The Machine ECM will force a shutdown of the machine when this code is active. The Operator Monitor displays a popup symbol in red when this diagnostic code is active. The Operator Monitor Warning LED displays in red when this code is active.
	2828-4	Main Hydraulic Pump Press Sensor 1:: Voltage Below Normal	The Machine ECM will force a shutdown of the machine when this code is active. The Operator Monitor displays a popup symbol in red when this diagnostic code is active. The Operator Monitor Warning LED displays in red when this code is active.
	2828-8	Main Hydraulic Pump Press Sensor 1: Abnormal Frequency, Pulse Width, or Period	The Machine ECM will force a shutdown of the machine when this code is active. The Operator Monitor displays a popup symbol in red when this diagnostic code is active. The Operator Monitor Warning LED displays in red when this code is active.
	4404-2	Left Joystick: Erratic, Intermittent, or Incorrect	The main and auxiliary (if equipped) implements are disabled.
	4404-9	Left Joystick:: Abnormal Update Rate	The main and auxiliary (if equipped) implements are disabled.
	5332-2	Left Travel Pedal Position: Erratic, Intermittent, or Incorrect	The left travel functions may be inoperable.
	5352-2	Left Travel Pedal Position: Erratic, Intermittent, or Incorrect	The left travel functions may be inoperable.
	5602-2	Left Travel Pedal Position Sensor Sig 1: Erratic, Intermittent, or Incorrect	Travel will not operate as requested.
	5602-3	Left Travel Pedal Position Sensor Sig 1:: Voltage Above Normal	Travel will not operate as requested.
	5602-4	Left Travel Pedal Position Sensor Sig 1:: Voltage Below Normal	Travel will not operate as requested.
	5602-8	Left Travel Pedal Position Sensor Sig 1: Abnormal Frequency, Pulse Width, or Period	Travel will not operate as requested.
	5603-2	Left Travel Pedal Position Sensor Sig 2: Erratic, Intermittent, or Incorrect	Travel will not operate as requested.
	5603-3	Left Travel Pedal Position Sensor Sig 2:: Voltage Above Normal	Travel will not operate as requested.
	5603-4	Left Travel Pedal Position Sensor Sig 2:: Voltage Below Normal	Travel will not operate as requested.
	5603-8	Left Travel Pedal Position Sensor Sig 2: Abnormal Frequency, Pulse Width, or Period	Travel will not operate as requested.
	5604-2	Right Travel Pedal Position Sensor Sig 1: Erratic, Intermittent, or Incorrect	Travel will not operate as requested.
	5604-3	Right Travel Pedal Position Sensor Sig 1:: Voltage Above Normal	Travel will not operate as requested.
	5604-4	Right Travel Pedal Position Sensor Sig 1:: Voltage Below Normal	Travel will not operate as requested.
	5604-8	Right Travel Pedal Position Sensor Sig 1: Abnormal Frequency, Pulse Width, or Period	Travel will not operate as requested.
	5605-2	Right Travel Pedal Position Sensor Sig 2: Erratic, Intermittent, or Incorrect	Travel will not operate as requested.
	5605-3	Right Travel Pedal Position Sensor Sig 2:: Voltage Above Normal	Travel will not operate as requested.
	5605-4	Right Travel Pedal Position Sensor Sig 2:: Voltage Below Normal	Travel will not operate as requested.
	5605-8	Right Travel Pedal Position Sensor Sig 2: Abnormal Frequency, Pulse Width, or Period	Travel will not operate as requested.
	5706-2	Imp Pedal Position Sensor Sig 1: Erratic, Intermittent, or Incorrect	Aux will not operate as requested.
	5706-3	Imp Pedal Position Sensor Sig 1:: Voltage Above Normal	Aux will not operate as requested.
	5706-4	Imp Pedal Position Sensor Sig 1:: Voltage Below Normal	Aux will not operate as requested.
	5706-8	Imp Pedal Position Sensor Sig 1: Abnormal Frequency, Pulse Width, or Period	Aux will not operate as requested.
	5707-2	Imp Pedal Position Sensor Sig 2: Erratic, Intermittent, or Incorrect	Aux will not operate as requested.
	5707-3	Imp Pedal Position Sensor Sig 2:: Voltage Above Normal	Aux will not operate as requested.
	5707-4	Imp Pedal Position Sensor Sig 2:: Voltage Below Normal	Aux will not operate as requested.
	5707-8	Imp Pedal Position Sensor Sig 2: Abnormal Frequency, Pulse Width, or Period	Aux will not operate as requested.
	5708-2	Imp Pedal Position Sensor Sig 2: Erratic, Intermittent, or Incorrect	Aux will not operate as requested.

Pulse Width Modulation (PWM) is a technique for controlling analog circuits with digital outputs. The duty cycle of a square wave is modulated to encode a specific analog signal level. The duty cycle is the ratio of the on-time to the period. The modulating frequency is the inverse of the period. The duty cycle is programmed into the software of the ECM.

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Illustration 1	g06361981
Machine ECM PWM Sensors

The preceding diagram is a simplified schematic of the Machine ECM connections. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of the Electrical Schematic for the complete schematic.

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Table 2
Left Joystick Position Sensor
Full Rear	Center	Full Forward
10%	50%	90%
Right Joystick Position Sensor
Left	Neutral	Right
10%	50%	90%

The preceding table is a reference that can be used when checking the signal of the PWM sensors.

Diagnostic Trouble Code Procedure

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Table 3
Required Tools
Tool	Part Number	Description	Qty
T1	146-4080⁽¹⁾	Digital Multimeter Group	1
	8T-3224	Needle Tip Group	1
	7X-1710	Multimeter Probe Group	1
	8T-8726	Cable Assembly (Three Pin) (3-Pin Breakout)	1
T2	JERD2129	Cat^® Electronic Technician (Cat ET)	1
		Windows-based PC	1
	466-6258	Communication Adapter Gp	1
T3	6V-4148	Connector Repair Kit (Sure Seal)	1
T4	190-8900	Connector Field Repair Kit (Deutsch)	1
T5	175-3700	Connector Repair Kit Deutsch DT	1

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⁽¹⁾	This multimeter can use an RS232C cable to connect to a Laptop computer or Dataview tool gp for troubleshooting.

Prior to beginning this procedure, use Cat^® Electronic Technician (Cat^® ET) Service Tool or the machine monitors to check for an active DTC 41 code. The DTC 41 indicates a failure of the 8 VDC power supply on the ECM. If the code is present, refer to the Sensor Supply - Test story to correct this problem before continuing. For transducers powered via the fuse panel, check the condition of the appropriate fuse before beginning the troubleshooting procedure.

Inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure. For sensors powered via the fuse panel, check the condition of the appropriate fuse before beginning the troubleshooting procedure.

Identify the active FMI code associated with the components.
Determine which code is present and use the list below to determine which procedure to follow.

FMI 2 diagnostic code, proceed to "FMI 2".
FMI 3 diagnostic code, proceed to "FMI 3".
FMI 4 diagnostic code, proceed to "FMI 4".
FMI 8 diagnostic code, proceed to "FMI 8".
FMI 13 diagnostic code, proceed to "FMI 13".

FMI 2

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Table 4
Verify The Software Version
1. Check and record the latest software version for the machine electronic controls from SIS. 2. Verify that the latest version of software has been loaded to the ECM.	All the software is current.	Result: All the software is current. Proceed to "Check The Harness", Table 5. Result: There is a more recent software release that is available. Repair: Flash all controls with the latest software release. Refer to Troubleshooting, "Electronic Control Module (ECM) Software - Install". Proceed to "Check If The Diagnostic Code Remains", Table 7.

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Table 5
Check The Harness
1. Turn the key start switch to the OFF position. 2. Inspect the harness. 3. Check for proper mating. 4. Check the exposed wires for nicks and abrasions. 5. Check for moisture, dirt, or corrosion. 6. Check the pin/socket for a proper fit. 7. Disconnect the machine harness connectors from the ECM. 8. Perform the following steps for each sensor: 9. Place a jumper wire between contact 1 and contact 2 of the sensor. 10. At the J1 connector of the ECM, measure the resistance from the sensor positive connector contact to the sensor negative contact.	The resistance is less than 5 Ω.	Result: The resistance is less than 5 Ω. Proceed to "Check For An Open In The Sensor Circuit", Table 6. Result: The resistance is greater than 5 Ω. There is an open in the machine harness. Repair: Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains", Table 7.

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Table 6
Check For An Open In The Sensor Circuit
1. Turn the keyswitch and the disconnect switch to the OFF position. 2. Disconnect the sensor from the ECM. 3. Disconnect the J1 and J2 wire harness from the ECM. 4. At the harness connector for the sensor, place a jumper wire between the signal contact and the supply contact. 5. At machine harness connector for the ECM, measure the resistance from the signal contact to the supply contact. 6. Gently pull on the wires and move the wires in a circular motion at the ECM connector. Observe the resistance readings. Repeat the process for the sensor connector.	The resistance is less than 5 Ωalways during the manipulation of the harness.	Result: The resistance is less than 5 Ω. The signal circuit and the ground circuits of the sensor are not open in the machine harness. Proceed to "Check If The Diagnostic Code Remains", Table 7. Result: Resistance reading for the signal circuit or the return circuit is greater than 5 K Ω. Repair: Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5 K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5 K Ω would indicate an open in the circuit. Proceed to "Check If The Diagnostic Code Remains", Table 7.

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Table 7
Check If The Diagnostic Code Remains
Troubleshooting Test Steps	Values	Results
1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the start switch and the disconnect switch ON. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety. 6. Check if the diagnostic code is active.	The diagnostic code is no longer present.	Result: The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP.

FMI 3

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Table 8
Check The Voltage At The Sensor
Troubleshooting Test Steps	Values	Results
1. Turn key start switch and disconnect switch ON. 2. Refer to the schematic to determine the voltage source for the sensor. 3. At the machine harness connector for the sensor, insert 7X-1710 multimeter probes along the contact of the sensor supply and along frame ground. 4. At the sensor harness connector, measure voltage between the sensor supply and frame ground.	Voltage reading is correct for the sensor.	Result: The voltage reading is correct for the sensor. Proceed to "Check The Harness For An Open" Table 9. Result: The voltage is NOT correct for the sensor. Repair: Examine all the connectors that are in the circuit. Ensure that the connections are clean, secure, and are in good condition. Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 11.

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Table 9
Check The Harness For An Open
Troubleshooting Test Steps	Values	Results
1. The key start switch and the disconnect switch remain in the OFF position. 2. Disconnect the machine harness connector from the sensor. 3. At the machine harness connector for the sensor, connect a jumper wire between the sensor return contact and signal contact. 4. Turn the key switch and disconnect switch ON. 5. Observe the status of the diagnostic code.	The diagnostic code changes from an FMI 3 to an FMI 4.	Result: The diagnostic code changes from an FMI 3 to an FMI 4. The sensor has failed. Repair: Replace the sensor. Proceed to "Check If The Diagnostic Code Remains" Table 11. Result: The diagnostic code does not change from an FMI 3 to an FMI 4. Proceed to "Check Signal Circuit For A Short to +Battery" Table 10.

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Table 10
Check Signal Circuit For A Short to +Battery
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and the disconnect switch to the OFF position. 2. Disconnect the ECM harness connectors. The sensor harness connector remains disconnected. 3. Remove the jumper wire that was installed in the previous test step. 4. At the ECM harness connector, measure the resistance between the signal contact and all other +battery circuits used in the ECM harness connectors.	Each resistance is greater than 5K Ω.	Result: Each resistance is greater than 5K Ω. The harness circuit is correct. Proceed to "Check If The Diagnostic Code Remains" Table 11. Result: The resistance is less than 5 Ω. Repair: A short exists in the harness between the signal circuit and the circuit with the low-resistance measurement. Repair or replace the machine harness. Note: A resistance greater than 5 Ω but less than 5K Ω indicates a loose or corroded connection in the circuit. A resistance measurement greater than 5K Ω indicates an open in the circuit. Proceed to "Check If The Diagnostic Code Remains" Table 11.

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Table 11
Check If The Diagnostic Code Remains
Troubleshooting Test Steps	Values	Results
1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the key start switch and the disconnect switch ON. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety lock. 6. Check if the diagnostic code is active.	The diagnostic code is no longer present.	Result: The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP.

FMI 4

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Table 12
Check The Sensor
Troubleshooting Test Steps	Values	Results
1. Turn the disconnect switch and the key start switch to the ON position. 2. Disconnect the sensor from the machine harness. 3. Observe the status of the diagnostic code as the sensor is disconnected from the harness.	The code changes from an FMI 4 to an FMI 3 when the sensor is disconnected.	Result: The code changes from an FMI 4 to an FMI 3 when the sensor is disconnected. The sensor has failed. Repair: Replace the sensor. Proceed to "Check If The Diagnostic Code Remains" Table 14. Result: The FMI 4 diagnostic code remains active when sensor is disconnected. The sensor is not the cause of the problem. Proceed to "Check The Signal Circuit For A Short To Ground" Table 13.

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Table 13
Check The Signal Circuit For A Short To Ground
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and the disconnect switch to the OFF position. 2. Disconnect the harness connectors from the ECM. The sensor remains disconnected from the machine harness. 3. At the ECM harness connector, measure the resistance between the sensor signal contact and all possible sources of ground.	All resistance values are greater than 5K Ω.	Result: All resistance values are greater than 5K Ω. The harness circuit is correct. Proceed to "Check If The Diagnostic Code Remains" Table 14. Result: One or more readings are less than 5 Ω. A short circuit exists between the signal circuit . Repair: Repair or replace the machine harness. Note: A resistance greater than 5 Ω but less than 5K Ω indicates a loose or corroded connection in the circuit. A resistance measurement greater than 5K Ω indicates an open in the circuit. Proceed to "Check If The Diagnostic Code Remains" Table 14.

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Table 14
Check If The Diagnostic Code Remains
Troubleshooting Test Steps	Values	Results
1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the key start switch and the disconnect switch to the ON position. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety lock . 6. Check if the diagnostic code is active.	The diagnostic code is no longer present.	Result: The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP.

FMI 8

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Table 15
Check The Signal Of The Sensor
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and disconnect switch to the OFF position. 2. At the back of the harness connector for the sensor, insert multimeter probes along the signal contact and return contact. Note: Use Cat^® Electronic Technician (Cat^® ET) Service Tool if access to the sensor while operating the machine, is not safe. 3. Turn the disconnect switch and the key start switch to the ON position. 4. Monitor the signal of the sensor with a digital multimeter. 5. Without disconnecting the sensor or the hardware that is associated with the sensor from the machine, take the sensor through the full operating range. Note: Refer to the table above for the proper signal.	The signal from the sensor responds in the manner that is described in the table above.	Result: The signal from the sensor responds correctly. The sensor is operating correctly. Proceed to "Check For An Open In The Signal Circuit" Table 16. Result: The signal from the sensor does not respond correctly. The sensor is not operating correctly. Repair: Replace the sensor. Proceed to "Check If The Diagnostic Code Remains" Table 17.

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Table 16
Check For An Open In The Signal Circuit
Troubleshooting Test Steps	Values	Results
1. The key start switch and the disconnect switch remain in the OFF position. 2. Disconnect the machine harness connector from the sensor. 3. At the machine harness connector for the sensor, connect a jumper wire between the return contact and signal contact . 4. Disconnect the machine harness connectors J1 and J2 from the ECM. 5. At the ECM harness connector, measure the resistance between the signal contact and return contact.	The reading is less than 5 Ω.	Result: The measurement is less than 5 Ω. The signal and return circuit are correct. Proceed to "Check If The Diagnostic Code Remains" Table 17. Result: The measurement is greater than 5K Ω. The signal circuit in the harness is open. Repair: Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 17.

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Table 17
Check If The Diagnostic Code Remains
Troubleshooting Test Steps	Values	Results
1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the key start switch and the disconnect switch to the ON position. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety lock lever. 6. Check if the diagnostic code is active.	The diagnostic code is no longer present.	Result: The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP.

FMI 13

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Table 18
Check the Calibration
Troubleshooting Test Steps	Values	Results
1. Perform the calibration procedure for the sensor. Refer to the "Calibration" procedure in this manual. 2. Observe the status of the diagnostic code.	The code is no longer active.	Result: The FMI 13 is no longer active. The calibration corrected the condition that caused the diagnostic code. Proceed to "Check If The Diagnostic Code Remains" Table 19. Result:The FMI 13 Code is active. The diagnostic code has not been corrected. Verify that the correct software has been flashed into the ECM, or that the correct ECM is installed on the machine. Then repeat the calibration. Proceed to "Check If The Diagnostic Code Remains" Table 19.

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Table 19
Check If The Diagnostic Code Remains
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and the disconnect switch ON. 2. Clear all diagnostic codes. 3. Operate the machine. 4. Stop the machine and engage the safety lock lever. 5. Check if the diagnostic code is active.	The diagnostic code is no longer present.	Result: The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP.