D7 Track-Type Tractor Electrohydraulic Systems Sensor Supply

Table 1
Implement ECM (MID 082)
J1939	CDL	Code Description	System Response
	41-3	8 VDC Supply: Voltage Above Normal	Sensors powered by the 8V supply will not function properly. A Warning level 3 will be generated Audible alarm will sound and a fault indicator will flash
	41-4	8 VDC Supply: Voltage Below Normal	Sensors powered by the 8V supply will not function properly. A Warning level 3 will be generated Audible alarm will sound and a fault indicator will flash
	262-3	5 VDC Sensor Power Supply: Voltage Above Normal	Sensors powered by the 5V supply will not function properly. A Warning level 3 will be generated
	262-4	5 VDC Sensor Power Supply: Voltage Below Normal	Sensors powered by the 5V supply will not function properly. A Warning level 3 will be generated
	1393-4	Output Driver Enable Line: Voltage Below Normal	No battery voltage when key is ON.
	1482-3	10 VDC Sensor Power Supply: Voltage Above Normal	Sensors powered by the 10V supply will not function properly. A Warning level 3 will be generated Audible alarm will sound and fault indicator will flash.
	1482-4	10 VDC Sensor Power Supply: Voltage Below Normal	Sensors powered by the 10V supply will not function properly. A Warning level 3 will be generated Audible alarm will sound and fault indicator will flash.

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Illustration 1	g06599845
Sensor supply circuits

The sensor supply is the voltage output originating from the electronic control module connections.

Machine ECM

The following is a list of Cat Data Link (CDL) codes that are associated with the sensor supply circuits of the machine.

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Table 2
Machine ECM (MID 39)
J1939	CDL	Code Description	System Response
	41-3	8 VDC Supply: Voltage Above Normal	Sensors powered by the 8V supply will not function properly. A Warning level 3 will be generated Audible alarm will sound and a fault indicator will flash
	41-4	8 VD4C1482 Supply: Voltage Below Normal	Sensors powered by the 8V supply will not function properly. A Warning level 3 will be generated Audible alarm will sound and a fault indicator will flash
	262-3	5V Sensor DC Power Supply: Voltage Above Normal	Sensors powered by the 5V supply will not function properly. A Warning level 3 will be generated Audible alarm will sound and a fault indicator will flash
	262-4	5V Sensor DC Power Supply: Voltage Below Normal	Sensors powered by the 5V supply will not function properly. A Warning level 3 will be generated Audible alarm will sound and a fault indicator will flash
	1482-3	10V Sensor DC Power Supply: Voltage Above Normal	Sensors powered by the 10V supply will not function properly. A Warning level 3 will be generated Audible alarm will sound and a fault indicator will flash
	1482-4	10V Sensor DC Power Supply: Voltage Below Normal	Sensors powered by the 10V supply will not function properly. A Warning level 3 will be generated Audible alarm will sound and a fault indicator will flash

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Illustration 2	g06600043
Sensor supply circuits

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 3 diagnostic code, proceed to "FMI 3".
FMI 4 diagnostic code, proceed to "FMI 4".

FMI 3

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Table 4
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 7. Result: The voltage is greater than the supply for the circuit. Proceed to "Check The Power Supply At The ECM" Table 5.

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Table 5
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 6. 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 7.

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Table 6
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 7. 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 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 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 8
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 11. 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 9.

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Table 9
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" Table10. 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 11.

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Table 10
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 11. 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 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.