TRANSMISSION AR 3T1785 - Caterpillar

Illustration 1 g02716744
Schematic of the Winch Spool In SolenoidThis diagnostic code is associated with the Winch Spool In solenoid. The FMI 04 means that the 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 ECM has failed. This is unlikely.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, secure and 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.System Response:The machine response is listed:
A level 1 warning will be generated. The winch spool in will not work but all other implements are still enabled.Note: The following procedure can create numerous related diagnostic codes. When all harnesses are reconnected, the related diagnostic codes will be shown as being not active. Clear all related diagnostic codes after this procedure is completed.Note: Ensure that CID 3191 FMI 04 for the solenoid is active. 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 ECM.
At the ECM end of the solenoid harness connector, measure the resistance from the signal contact 27 (wire J807-BK) to all contacts that are used in the machine harness connectors for the ECM.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 27 (wire J807-BK) 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 the key start switch and the disconnect switch remain in the OFF position.
The machine harness remains disconnected from the ECM.
Install a jumper wire between pin 1 and 2 of the machine harness connector for the solenoid.
At the machine harness connector, measure the resistance from signal contact 26 (wire F869-PK) to return contact 27 (wire J807-BK). 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 wire with the resistance measuring greater than 5000 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness.The open