D7 Track-Type Tractor Electrohydraulic Systems Sensor Signal (Analog, Active)

Table 1
Implement ECM (MID 82)
J1939	CDL	Code Description	System Response
	96-3	Fuel Level Sensor: Voltage: Voltage above normal	Fuel level gauge will be inaccurate.
	96-4	Fuel Level Sensor: Voltage: Voltage below normal	Fuel level gauge will be inaccurate.
	1450-2	Main Hydraulic Pump Oil Pressure Sensor: Data Erratic, Intermittent, or Incorrect	Solenoid calibrations are not functional.
	1450-3	Main Hydraulic Pump Oil Pressure Sensor: Voltage Above Normal	Solenoid calibrations are not functional.
	1450-4	Main Hydraulic Pump Oil Pressure Sensor: Voltage Below Normal	Solenoid calibrations are not functional.
	1450-8	Main Hydraulic Pump Oil Pressure Sensor: Abnormal Frequency, Pulse Width, or Period	Solenoid calibrations are not functional.

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Illustration 1	g06497333
Implement ECM Sensor Signal (Analog, Active) connections

Machine ECM

The following is a list of Cat Data Link (CDL) codes that are associated with the active, analog sensors of the machine.

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Table 2
Machine ECM (MID 39)
J1939	CDL	Code Description	System Response
	473-3	Steering Charge Pressure Sensor: Voltage Above Normal	The ECM will not be able to read steering charge pressure. Steering and/or machine performance may be affected.
	473-4	Steering Charge Pressure Sensor: Voltage Below Normal	The ECM will not be able to read steering charge pressure. Steering and/or machine performance may be affected.

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Illustration 2	g03659410
Machine ECM Sensor Signal (Analog, Active) schematic

The preceding diagrams are simplified schematics of the ECM connections. The schematics are electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of the electrical schematic for your machine.

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
	538-5051	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, 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. Check the wiring for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing a 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 2

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Table 4
Check The Resistance Of The Sensor
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and the disconnect switch to the OFF position. 2. Disconnect the speed sensor from the machine harness. 3. Measure the resistance between contacts 1 and 2 of the connector for the speed sensor. 4. Refer to the table above for the correct resistance values.	The resistance values for the speed sensors are correct according to the table above.	Result: The resistance of the speed sensor is within the expected range. Proceed to "Check The Signal Circuit For An Open" Table 5. Result: The resistance of the speed sensor is outside the expected range. The speed sensor has failed. Repair: Replace the speed sensor. Proceed to "Check If The Diagnostic Code Remains" Table 7.

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Table 5
Check The Signal Circuit 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 speed sensor from the machine harness. 3. Disconnect the machine harness connectors from the ECM. 4. At the speed sensor harness connector, insert a jumper wire between the signal and return wires. 5. At the ECM harness connector, measure the resistance between the signal contact and the return contact.	The resistance value is less than 5 Ω.	Result: The resistance value is less than 5 Ω. The harness is correct. Proceed to "Check The Signal For A Short" Table 6. Result: The resistance is greater than 5K Ω. There is an open circuit in the signal circuit or the return circuit. Note: A resistance greater than 5 Ω but less than 5KΩ indicates a loose connection or corroded connection in the circuit. A resistance value that is greater than 5K Ω would indicate an open in the circuit. Repair: Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 7.

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Table 6
Check The Signal For A Short
Troubleshooting Test Steps	Values	Results
1. Remove the jumper wire that was installed in the previous test step. 2. Reconnect the speed sensor to the machine harness. 3. At the ECM machine harness connectors, measure the resistance between the signal contact and all the other contacts that are used for the ECM. 4. At the ECM machine harness connectors, measure the resistance between the return contact and all the other contacts that are used for the ECM.	Each resistance value is greater than 5K Ω	Result: Each resistance value is greater than 5K Ω. Proceed to "Check If The Diagnostic Code Remains" Table 7. Result: A resistance value is less than 5 Ω. There is a short in the machine harness. The short is between the signal circuit or the return circuit and the circuit with low resistance. Repair: Repair or replace the machine harness. 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 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 AVSpare. This consultation may effect repair time. For more information refer to the "ECM - Replace" section if the ECM needs to be replaced. STOP.

FMI 3

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Table 8
Check The Voltage At The Sensors
Troubleshooting Test Steps	Values	Results
1. Turn key start switch and disconnect switch ON. 2. Disconnect the machine harness connector for the sensors. 3. At the machine harness connector for the sensors, measure the voltage between the sensor supply contact and the sensor return contact.	Voltage reading is correct for the sensors.	Result: The voltage reading is correct for the sensors. Proceed to "Check If The Diagnostic Code Remains" Table 11. Result: The voltage is greater than the supply for the circuit. Proceed to "Check The Power Supply At The ECM" Table 9.

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Table 9
Check The Power Supply At The ECM
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and disconnect switch to the OFF position. 2. At the J1 harness connector for the ECM, use a 151-6320 Removal Tool to remove the supply wire and the sensor return wire. The harness connector remains connected to the ECM. 3. Turn the disconnect switch and the key start switch to the ON position. 4. Use the multimeter probes to make contact on the connector pins. Measure the voltage at the ECM pins between the sensor supply contact and sensor return contact .	Voltage reading is correct for the supply.	Result: The voltage is correct. The ECM power supply is correct. Install the wires and sockets that were removed from the ECM connector back into the original locations. Proceed to "Check For A Short In the Harness" Table 10. Result: The voltage measurement is greater than the supply voltage. The measurement is not correct. The ECM may have failed. Proceed to "Check If The Diagnostic Code Remains" Table 11.

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Table 10
Check For A Short In the Harness
Troubleshooting Test Steps	Values	Results
1. The sensors remain disconnected from the machine harness. 2. The key start switch and disconnect switch remain in the OFF position. 3. Disconnect the machine harness connectors from the ECM. 4. At the ECM harness connector, measure the resistance between the supply contact and all the other contacts that are used for the ECM.	Each resistance is greater than 5K Ω.	Result: Each resistance is greater than 5K Ω. Proceed to "Check If The Diagnostic Code Remains" Table 11. Result: One or more readings less than 5 Ω. There is a short between the signal contact and the circuit with the low resistance. Repair: Refer to the complete electrical schematic. Examine all the connectors of the machine harness for possible short circuits. Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate 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 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 AVSpare. This consultation may effect repair time. For more information refer to the "ECM - Replace" section if the ECM needs to be replaced. STOP.

FMI 4

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Table 12
Check The Sensors
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and disconnect switch to the ON position. 2. Observe the status of the diagnostic code as each sensor is disconnected.	The FMI 4 diagnostic code is no longer active when one of the sensors on the supply circuit is disconnected.	Result: The diagnostic code is not active when one of the sensors in the supply circuit is disconnected. The power supply circuit is correct. Repair: Repeat this test step to determine the sensor that causes the problem. Replace the sensor that is causing the problem. Proceed to "Check If The Diagnostic Code Remains" Table 15. Result: The diagnostic code is still active. Disconnecting the sensors in the circuit did not affect the status of the diagnostic code. 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. 3. Measure the resistance between the power supply contact and frame ground. 4. Measure the resistance between the power supply contact and all the other contacts that are used for the ECM.	Each resistance is greater than 5K Ω.	Result: Each resistance is greater than 5K Ω. The harness circuit is correct. Proceed to "Check The Power Supply At The ECM" Table14. Result: The resistance is less than 5 Ω. The power supply circuit is shorted to ground. The short circuit exists between the power supply circuit and the circuit with the low-resistance measurement. Repair: Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 15.

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Table 14
Check The Power Supply At The ECM
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and disconnect switch to the OFF position. 2. At the J1 harness connector for the ECM, use a 151-6320 Removal Tool to remove the supply wire and the sensor return wire. The harness connector remains connected to the ECM. 3. Turn the disconnect switch and the key start switch to the ON position. 4. Use the multimeter probes to make contact on the connector pins. Measure the voltage at the ECM pins between the sensor supply contact and sensor return contact .	Voltage reading is correct for the supply.	Result: The voltage is correct. The ECM power supply is correct. Install the wires and sockets that were removed from the ECM connector back into the original locations. Proceed to "Check If The Diagnostic Code Remains" Table 15. Result: The voltage measurement is less than the supply voltage. The measurement is not correct. The ECM has failed. Proceed to "Check If The Diagnostic Code Remains" Table 15.

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Table 15
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 AVSpare. This consultation may effect repair time. For more information refer to the "ECM - Replace" section if the ECM needs to be replaced. STOP.

FMI 8

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Table 16
Verify The Software Version
Troubleshooting Test Steps	Values	Results
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.	The software is current.	Result: All the software is current. Proceed to "Check The Resistance Of The Sensor" Table 17. Result: There is a more recent software release that is available. Proceed to "Check If The Diagnostic Code Remains" Table 20. Repair: Flash all controls with the latest software release. Refer to the "ECM Software - Install" section for more information.

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Table 17
Check The Resistance Of The Sensor
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and disconnect switch to the OFF position. 2. Disconnect the sensor from the machine harness. 3. Measure the resistance between contacts 1 and 2 of the connector for the speed sensor. 4. Refer to the table above for the correct resistance values.	The resistance values for the speed sensors are correct according to the table above.	Result: The resistance of the speed sensor is within the expected range. Proceed to "Check The Signal Circuit For An Open" Table 18. Result: The resistance of the speed sensor is outside the expected range. The speed sensor has failed. Repair- Replace the speed sensor. Proceed to "Check If The Diagnostic Code Remains" Table 20.

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Table 18
Check The Signal Circuit 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. Disconnect the machine harness connectors from the ECM. 4. At the harness connector for the sensor, place a jumper wire between the signal contact and the return contact. 5. At machine harness connector for ECM, measure the resistance between the signal contact the return contact.	The resistance value is less than 5 Ω.	Result: The resistance value is less than 5 Ω. The harness is correct. Proceed to "Check The Signal Circuit For A Short" Table 19. Result: The resistance is greater than 5K Ω. There is an open circuit in the signal circuit or the return circuit. Note: A resistance greater than 5 Ω but less than 5KΩ indicates a loose connection or corroded connection in the circuit. A resistance value that is greater than 5K Ω would indicate an open in the circuit. Repair: Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 20.

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Table 19
Check The Signal Circuit For A Short
Troubleshooting Test Steps	Values	Results
1. The disconnect switch and the key start switch remain OFF. 2. The sensor and the ECM remain disconnected from the harness. 3. Measure the resistance between the signal contact and all other contacts used in the ECM harness connectors.	The resistance values are greater than 5K Ω.	Result: The resistance values are greater than 5K Ω. The harness circuit is correct. Proceed to "Check If The Diagnostic Code Remains" Table 20. Result: A resistance value is less than 5 Ω. Repair: A short exists in the harness between the signal circuit and the circuit with the low-resistance value. Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance value that is greater than 5K Ω would indicate an open in the circuit. Proceed to "Check If The Diagnostic Code Remains" Table 20.

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Table 20
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 AVSpare. This consultation may effect repair time. For more information refer to the "ECM - Replace" section if the ECM needs to be replaced. STOP.