PUMP GP-PISTON 2228451 - Caterpillar

Illustration 1 g03811823
Schematic of the "Reversing Fan Solenoid"
This diagnostic code is associated with the "Reversing Fan Solenoid". The FMI 05 diagnostic code means that the ECM has determined that the current of the solenoid is below normal.The possible causes of this diagnostic code are listed below:
The energize circuit of the solenoid is open.
The ground circuit of the solenoid is open.
The solenoid has failed.
The ECM has failed. The ECM is unlikely to fail.Note: Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, that all connections are secure and that all connections are in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure. Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:When this diagnostic code occurs, the direction of the engine fan will not reverse.Test Step 1. Check The Solenoid
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Disconnect the solenoid with the active diagnostic code from the machine harness.
At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire H704-PK(Pink)) to contact 2 (wire C988-BK(Black)).
Observe the status of the CID 485 FMI 05 diagnostic code. Expected Result:The CID 485 FMI 05 diagnostic code remains active. The FMI 05 code has not changed and the code is still active.Results:
YES - The diagnostic code remains active. The jumper wire does not affect the diagnostic code. Proceed to Test Step 2.
NO - The diagnostic is no longer active. The solenoid has failed.Repair: The solenoid has failed. Repeat this Test Step "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid. Verify that the new solenoid corrects the problem.STOPTest Step 2. Check The Harness For An Open
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from the ECM.
The jumper wire that was installed in the previous Test Step remains in place.
At the machine harness connector, measure the resistance from signal contact J1-5 (wire H704-PK(Pink)) to ground J1-21 (wire C988-BK(Black)).
Observe the resistance measurement of the multimeter and wiggle the harness connectors of the Machine ECM. Wiggle the harness connector for the solenoid and observe the resistance measurement of the multimeter. Gently pull on the wires and wiggle the wires. Expected Result:The resistance is less than 5.0 ohms at all times during the manipulation of the harness and the connectors.Results:
OK - The resistance is less than 5.0 ohms. The resistance measurement is not indicating an open or a bad connection in the circuit. Proceed to Test Step 3.
NOT OK - The resistance is greater than 5000 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness.Repair: A resistance measurement of greater than 5000 ohms is an indication