HEAD ASSEM. 7N9532 - Caterpillar

Illustration 1 g03569484
Schematic for the solenoids associated with the Implement ECM J1 and J2 connections.
Illustration 2 g03572456
Schematic for the solenoids associated with the Implement ECM J1 Connections for Implements
Note: The diagram above is a simplified schematic of the electrical circuit. 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 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. 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.
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 5 diagnostic code, proceed to Test Step 3.
FMI 6 diagnostic code, proceed to Test Step 5.
FMI 13 diagnostic code, proceed to Test Step 8.
Begin Process For FMI 3 Troubleshooting Here
2. Check The Machine Harness 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. Measure the resistance of suspect solenoid contact signal wire to all J1 and J2 contacts.
Each reading is greater than 5K Ω. OK: All resistance readings are greater than 5K Ω.
Proceed to Test Step 7.
NOT OK: One or more readings are less than 5 Ω.
Repair: A short exists between the signal contact 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 Test Step 7.
Begin Process For FMI 5 Troubleshooting Here
3. Check The Solenoid.
A. Turn the key start switch and the disconnect switch OFF.
B. Disconnect the solenoid from the machine harness.
C. Place a jumper wire between contacts 1 and 2, at the harness connector for the solenoid.
D. Turn the key start switch and the disconnect switch ON. Do not start the engine.
The code changes to FMI 6 after the jumper wire is installed. OK: The circuit is correct, the solenoid has failed.
Repair: Replace the solenoid.
Proceed to Test Step 7.
NOT OK: The diagnostic code remains active.
Proceed to Test Step 4.
4. Check The Machine Harness For An Open
A. Turn the key start switch and the disconnect switch OFF.
B. Disconnect the harness connectors from the ECM (or switch panel).
C. The jumper wire remains installed.
D. At the machine harness connector for the ECM, measure the resistance at the ECM contacts for the solenoid.
Each reading is less than 5 Ω.