PL72, PL83 and PL87 Pipelayers Caterpillar

Solenoid Return - Test

Usage:

PL83 CB2

Implement ECM

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

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Table 1
Implement ECM
DTC	Code Description	System Response
4513-3	Hook Free Fall Clutch Solenoid Return: Voltage Above Normal	Hook Free Fall Clutch is disabled
4513-6	Hook Free Fall Clutch Solenoid Return: Current Above Normal	Hook Free Fall Clutch is disabled

Possible Causes for an FMI 3 diagnostic code are:

The return circuit of the solenoid is shorted to another voltage source.
The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 6 diagnostic code are:

The return circuit for the solenoid is shorted to a ground source.
The ECM has failed. A failure of the ECM is unlikely.

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Illustration 1	g03863271
Schematic of the Implement solenoid return connections

Note: The diagram above is a simplified schematic of the connections for the solenoid return connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of the electrical schematic for the specific machine being serviced for the complete schematic.

Diagnostic Trouble Code Procedure

Note: 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.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Identify Active FMI Code Associated With Solenoid Circuit	Code present.	FMI 3 diagnostic code, proceed to Test Step 2. FMI 6 diagnostic code, proceed to Test Step 4.
2. Check The Return Circuit Of The Solenoid For A Short A. Turn the key start switch and the disconnect switch OFF. B. Disconnect the harness connection at solenoid. C. Disconnect J1 and J2 connectors from ECM. D. At the machine harness connectors for the ECM, measure the resistance between the return contact of the solenoid and each of the other circuits that are used in the J1 and J2 connectors for the ECM.	Each reading is greater than 5K Ω.	OK - All resistance readings are greater than 5K Ω . Proceed to Test Step 3. NOT OK - One or more readings are less than 5 Ω. Repair: A short exists between the return contact and the circuit with the low resistance. Note: For information on testing for short circuits and finding short circuits, refer to Testing and Adjusting, "Wiring Harness (Short Circuit) - Test". Repair the machine harness or replace the machine harness. Proceed to Test Step 5.
3. Check The Operation Of The ECM A. At the machine harness connector for the ECM, use a removal tool to remove the return wire from the harness connector. B. Reconnect the machine harness J1 and J2 connectors to the ECM. C. Turn the disconnect switch and the key start switch to the ON position. D. Observe the status of the active diagnostic code.	The CID 681 FMI 03 diagnostic code is no longer active. A CID 681 FMI 05 diagnostic code is now active.	OK - The CID 681 FMI 03 diagnostic code is no longer active. A CID 681 FMI 05 diagnostic code has been activated after the energize wire of the solenoid was disconnected. The ECM has responded correctly to the open circuit of the solenoid. Note: Reinstall the disconnected energize wire of the solenoid into the correct connector of the ECM. Proceed to the next test step. Proceed to Test Step 5. NOT OK - The CID 681 FMI 03 diagnostic code remains active. The status of the active diagnostic code did not change when the energize wire of the solenoid was disconnected from the ECM. Repair:The ECM has not responded correctly to the open condition in the solenoid circuit. The ECM could be causing the problem. Prior to replacing an ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. If the ECM must be replaced, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Proceed to Test Step 5.
Begin Process For FMI 6 Troubleshooting HERE
4. Check The Solenoid Return Circuit For A Short To Ground A. Turn the key start switch and the disconnect switch OFF. B. Disconnect the solenoid from the machine harness. C. Disconnect the machine harness connectors J1 and J2 from the ECM. D. At the machine harness connectors for the ECM, measure the resistance between the solenoid return contact and frame ground. Measure the resistance between the return contact and each of the other J1 and J2 circuits that are used in the ECM connectors.	Each resistance measurement is greater than 50 ohms.	OK - Each resistance measurement is greater than 50 ohms. Proceed to Test Step 5. NOT OK - One or more of the resistance measurements is less than 50 ohms. There is a short in the machine harness. Repair: Repair or replace the machine harness. Proceed to Test Step 5.
5. Check If The Diagnostic Code Remains A. Turn the key start switch and the disconnect switch ON. B. Clear all diagnostic codes. C. Operate the machine. D. Stop the machine and engage the parking brake. E. Check if diagnostic code for the solenoid is active.	Code for solenoid is NO longer present.	OK - The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP NOT OK - 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 Communication at your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP