815 Soil Compactor and 816 Landfill Compactor Systems Sensor Supply

Table 1
Transmission ECM (MID 081)
J1939	CDL	Code Description	System Response
	0041-3	8 Volt DC Supply : Voltage Above Normal	Sensors powered by the 8 V DC supply may not function properly.
	0041-4	8 Volt DC Supply : Voltage Below Normal	Sensors powered by the 8 V DC supply may not function properly.
	1482-3	10 Volt Sensor DC Power Supply : Voltage Above Normal	Sensors powered by the 10 V DC supply may not function properly.
	1482-4	10 Volt Sensor DC Power Supply : Voltage Below Normal	Sensors powered by the 10 V DC supply may not function properly.

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

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Illustration 1	g06602904
Transmission ECM Sensor Supply circuits

The preceding diagram is a simplified schematic of the Transmission ECM connections. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, M0115149 or Electrical Schematic, M0115151 for the complete schematic.

Implement ECM

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

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Table 2
Implement ECM (MID 082)
J1939	CDL	Code Description	System Response
	0041-3	8 Volt DC Supply : Voltage Above Normal	Sensors powered by the 8 VDC supply may not function properly.
	0041-4	8 Volt DC Supply : Voltage Below Normal	Sensors powered by the 8 V DC supply may not function properly.
	0262-3	5 Volt DC Supply : Voltage Above Normal	Sensors powered by the 5 V DC supply may not function properly.
	0262-4	5 Volt DC Supply : Voltage Below Normal	Sensors powered by the 5 V DC supply may not function properly.
	1482-3	10 Volt Sensor DC Power Supply : Voltage Above Normal	Sensors powered by the 10 V DC supply may not function properly.
	1482-4	10 Volt Sensor DC Power Supply : Voltage Below Normal	Sensors powered by the 10 V DC supply may not function properly.

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

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Illustration 2	g06602912
Implement ECM Sensor Supply circuits

The preceding diagram is a simplified schematic of the Implement ECM connections. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, M0115149 or Electrical Schematic, M0115151 for the complete schematic.

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. 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 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. Follow the steps in Troubleshooting, "ECM - Replace" 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. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP.