BELLOWS AS 3479308 - Caterpillar

Illustration 1 g02721399
Connections of the ripper lower solenoid
This diagnostic code is associated with the ripper lower solenoid. The FMI 04 means that the valve ECM has determined that either an open in the circuit or a short to ground in the return circuit exists.The possible causes are listed:
The return circuit of the solenoid is shorted to ground.
The energize circuit of the solenoid is open.
The return circuit of the solenoid is open.
The solenoid has failed.
The valve ECM has failed. This is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 3187 FMI 04 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.System Response:The winch does not operate correctly.Test Step 1. CHECK THE RETURN CIRCUIT OF THE SOLENOID FOR A SHORT TO GROUND.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the solenoid from the machine harness.
Disconnect the machine harness at the valve ECM.
At the harness connector for the valve ECM, measure the resistance from the signal contact 43 (wire H806-OR(Orange)) to all contacts that are used in the machine harness connector. Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
YES - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 2.
NO - Each resistance measurement is NOT greater than 5000 ohms. There is a short in the machine harness between signal contact 43 (wire H806-OR(Orange)) and the circuit with the low resistance measurement.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE HARNESS FOR AN OPEN.
The key start switch and the disconnect switch remain in the OFF position.
The machine harness remains disconnected from the valve ECM.
The solenoid remains disconnected from the machine harness.
At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire J914-PU(Purple)) to contact 2 (wire H806-OR(Orange)).
At the machine harness connector for the valve ECM, measure the resistance from signal contact 42 (wire J914-PU(Purple)) to return contact 43 (wire H806-OR(Orange)). Expected Result:The resistance should be less than 5.0 ohms.Results:
OK - The resistance is less than 5.0 ohms. The machine harness is correct. 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: The open is in the signal wire (J914-PU(Purple)) or the return wire (H806-OR(Orange)) of the machine harness. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE SOLENOID.
Remove the jumper wire from the previous Test Step.
Reconnect the machine harness to the valve ECM.
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
The solenoid remains disconnected from the machine harness.
At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire J914-PU(Purple)) to contact 2 (wire H806-OR(Orange)).
Observe the status