WASHER-THRUST 2W1577 - Caterpillar

Illustration 1 g02139446
The "Fine Swing" solenoid is identified by the arrow in the photograph.
Illustration 2 g02296574
Schematic Of The "Fine Swing" solenoidThis diagnostic code is associated with the fine swing solenoid. The diagnostic code is recorded when the ECM reads the voltage of the solenoid circuit as above normal.The possible causes of this diagnostic code are listed:
The harness is shorted.
The Machine ECM has failed. A failure of the ECM is unlikely.Test Step 1. CHECK THE SIGNAL CIRCUIT FOR A SHORT.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the solenoid.
Disconnect the machine harness connectors J1 and J2 from the ECM.
At the machine harness connector for the switch panel C3, measure the resistance from the solenoid signal contact C3-6 (wire L973-GN) to all other J1 and J2 connector contacts on the Machine ECM. Expected Result:Each resistance should be greater than 5000 ohms.Results:
YES - Each resistance is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 2.
NO - There is a short in the machine harness. Repair: The short is between the signal contact on the switch panel C3-6 (wire L973-GN) and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the contacts and clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Clear all inactive diagnostic codes.
Check if the diagnostic code for the solenoid is present.Expected Result:The diagnostic code for the solenoid is no longer present.Results:
YES - The diagnostic code is not present. The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors. Resume normal machine operation.STOP
NO - The diagnostic code has not been corrected.Repair: A failure of the ECM is unlikely. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code is active. If the cause of the diagnostic code is not found, replace the ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP