D7 Track-Type Tractor Electrohydraulic Systems Solenoid Return

Table 1
Implement ECM (MID 82)
J1939	CDL	Code Description	System Response
	1677-4	Solenoid Return #4: Voltage Below Normal	The function or functions associated with the return connections will not function. Review the circuit diagram within this section for the solenoid functions associated with this circuit.
	1677-5	Solenoid Return #4: Current Below Normal	The function or functions associated with the return connections will not function. Review the circuit diagram within this section for the solenoid functions associated with this circuit.
	1678-4	Solenoid Return #5: Voltage Below Normal	The function or functions associated with the return connections will not function. Review the circuit diagram within this section for the solenoid functions associated with this circuit.
	1678-5	Solenoid Return #5: Current Below Normal	The function or functions associated with the return connections will not function. Review the circuit diagram within this section for the solenoid functions associated with this circuit.

Solenoids are used to shutoff, release, distribute, or mix fluids on the machine. Generally, multiple solenoids are located together on a manifold. The solenoid converts electrical energy into magnetic energy, moving a spool located inside the housing of the valve. A spring is used to hold the spool in position until the solenoid is energized.

The magnetic force that acts on the valve spool is created when a coil inside the solenoid is energized.

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Illustration 1	g06594098
Implement ECM solenoid connections

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 Service Schematic for your machine for the complete schematic:

Machine ECM

The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the solenoid return circuits of the machine.

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Table 2
Machine ECM (MID 39)
J1939	CDL	Code Description	System Response
	1677-6	Solenoid Return #4: Current Above Normal	The function or functions associated with the return connections will not function. Review the circuit diagram within this section for the solenoid functions associated with this circuit.
	1678-4	Solenoid Return #5: Voltage Below Normal	The function or functions associated with the return connections will not function. Review the circuit diagram within this section for the solenoid functions associated with this circuit.
	1678-5	Solenoid Return #5: Current Below Normal	The function or functions associated with the return connections will not function. Review the circuit diagram within this section for the solenoid functions associated with this circuit.

The magnetic force that acts on the valve spool is created when a coil inside the solenoid is energized.

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Illustration 2	g06594427
Machine ECM solenoid connections

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 Electrical Service Schematic for your machine 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. Check the wiring harness 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 the 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 4 diagnostic code, proceed to "FMI 4".
FMI 5 diagnostic code, proceed to "FMI 5".
FMI 6 diagnostic code, proceed to "FMI 6".

FMI 4

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Table 4
Check The Machine Harness For An Open
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and the disconnect switch OFF. 2. Disconnect the solenoid from the machine harness. 3. Disconnect the harness connectors at the ECM. 4. Connect a jumper wire between the signal contact and return contact at the solenoid harness connector. 5. At the ECM side of the machine harness, measure the resistance between the signal and return contact.	Each reading is less than 5 Ω.	Result: The reading is less than 5 Ω, the harness is correct. Proceed to "Check The Harness For A Short To Ground" Table 5. Result: The reading is greater than 5K Ω. There is an open in machine harness. Repair: The open is in the signal wire or the return wire. 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 6.

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Table 5
Check The Harness For A Short To Ground
Troubleshooting Test Steps	Values	Results
1. The key start switch and disconnect switch remain in the OFF position 2. The ECM and solenoid remain disconnected from the machine harness. 3. Remove the jumper wire that was installed in the previous Test Step. 4. Measure the resistance between the signal contact and frame ground. Record the measurement. 5. Measure the resistance between the return contact and frame ground. Record the measurement.	Each reading is greater than 5K Ω.	Result: The reading is greater than 5K Ω, the harness is correct. Proceed to "Check If The Diagnostic Code Remains" Table 6. Result: The reading is less than 5 Ω. There is a short in the machine harness. Repair: The short is between the wires with the low-resistance measurement. 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 6.

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Table 6
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 5

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Table 7
Check The Solenoid
Troubleshooting Test Steps	Values	Results
1. Turn the start switch and the disconnect switch OFF. 2. Disconnect the solenoid from the machine harness. 3. At the harness connector for the solenoid, install a jumper wire between contact 1 and contact 2. 4. Turn the start switch and the disconnect switch ON. Do not start the engine.	The FMI 5 diagnostic code changes to an FMI 6 after the jumper wire is installed.	Result: The harness is correct. The FMI 5 diagnostic code changes to an FMI 6 when the jumper wire is installed. The solenoid has failed. Repair: Replace the solenoid. Proceed to "Check If The Diagnostic Code Remains" Table 9. Result: The diagnostic code remains active. Proceed to "Check The Harness For An Open" Table 8.

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Table 8
Check The Harness For An Open
Troubleshooting Test Steps	Values	Results
1. Turn the start switch and the disconnect switch OFF. 2. Disconnect the harness connectors from the ECM. 3. The jumper wire remains installed. 4. At the machine harness connector for the ECM, measure the resistance between the signal circuit and return circuit. Note: For solenoids that return to ground, measure the resistance between the signal circuit at the ECM harness connector and frame ground.	Each reading is less than 5 Ω.	Result: The reading is less than 5 Ω. The harness is correct. Proceed to "Check If The Diagnostic Code Remains" Table 9. Result: The reading is greater than 5K Ω. The open is in the signal circuit or the return circuit. Repair: 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 9.

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Table 9
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 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 6

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Table 10
Check The Solenoid
Troubleshooting Test Steps	Values	Results
1. Turn the start switch and the disconnect switch OFF. 2. Disconnect the solenoid from the machine harness. 3. Turn the start switch and the disconnect switch ON. Do not start the engine. 4. Observe the status of the diagnostic code.	The FMI 6 changes to an FMI 5 after the solenoid is disconnected.	Result: The circuit is correct. The solenoid has failed. Repair: Repeat the test. Verify the solenoid failure. Replace the solenoid. Proceed to "Check If The Diagnostic Code Remains" Table 12. Result: The diagnostic code remains active. Proceed to "Check Machine Harness For A Short To Ground" Table 11.

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Table 11
Check Machine Harness For A Short To Ground
Troubleshooting Test Steps	Values	Results
1. The machine harness remains disconnected from the solenoid. 2. Turn the start switch and the disconnect switch OFF. 3. Disconnect the harness connectors from the ECM. 4. At the harness connector for the ECM, measure the resistance between the solenoid signal contact and all ground contacts.	Each reading is greater than 5K Ω.	Result: Machine harness correct. Proceed to "Check If The Diagnostic Code Remains" Table 12. Result: One or more of the resistance measurements are less than 5 Ω. A short circuit exists in the machine harness. Repair: A short circuit exists between the signal wire and the circuit with the low resistance. 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 12.

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Table 12
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 AVSpare. This consultation may effect repair time. For more information refer to the "ECM - Replace" section if the ECM needs to be replaced. STOP.