SEAL 3V5478 - Caterpillar

Illustration 1 g02719003
Schematic of the Drive Pump Reverse Control Solenoid (Axle)This diagnostic code is associated with the Drive Pump Reverse Control Solenoid (Axle). The FMI 06 means that the ECM has detected that the current for the solenoid circuit is above normal. The following conditions could cause this diagnostic code to be activated:
The energize circuit of the solenoid is shorted to a voltage source.
The energize circuit of the solenoid is shorted to a ground source.
The solenoid has failed.
The ECM has failed. The failure of the ECM is unlikely. System Response:A Level 3 warning is generated.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 and secure. Verify that all connections in the circuit 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. After making any possible fix to the circuit, attempt to actuate the solenoid in order to determine if the Diagnostic Code still exists. Some Diagnostic Codes may not display until the engine is running.Test Step 1. CHECK THE SOLENOID
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Observe the status of the diagnostic code.
Disconnect the solenoid with the active diagnostic code from the machine harness. Expected Result:The active CID 2731 FMI 06 diagnostic code changes to a CID 2731 FMI 05 diagnostic code when the solenoid is disconnected.Results:
YES - The active CID 2731 FMI 06 diagnostic code changes to a CID 2731 FMI 05 diagnostic code when the solenoid is disconnected. The solenoid circuit in the machine harness is correct.Repair: The solenoid has failed. Repeat this test "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid.STOP
NO - The CID 2731 FMI 06 diagnostic code remains active. Disconnecting the solenoid did not change the status of the active diagnostic code. The solenoid is not causing the problem. Proceed to Test Step 2.Test Step 2. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORTThe solenoid remains disconnected from the machine harness.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness ECM connectors C1 and C2 from the ECM.
At the machine harness ECM connectors, measure the resistance from the signal contact C2-6 (wire K726-BU) to frame ground. Measure the resistance from the signal contact C2-6 (wire K726-BU) to all of the other contacts that are used in C1 and C2 ECM connectors.
While observing the multimeter resistance measurements, wiggle the machine harness connectors for the ECM and the solenoid. Gently pull on the wires and move the wires all around.Expected Result:Each resistance measurement is greater than 5000 ohms at all times during the manipulation of the harness and connectors.Results:
OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test