PAN AS-OIL 1W0056 - Caterpillar

Illustration 1 g03648429
Schematic of the Quick Coupler Solenoid CircuitNote: Two quick coupler valves can be used on excavators that operate hydromechanical work tools, such as hammers, shears, pulverizers, and multiprocessors. Refer to Special Instruction, GEHS0431, "Installation Procedure for the 417-4689 Hydraulic Lines Kit on Certain 336E and 336E H Excavators".
Illustration 2 g01411830
Quick Coupler SolenoidThis diagnostic code is associated with the Quick Coupler Solenoid. The FMI 03 diagnostic code means that the voltage of the solenoid circuit is above normal or voltage is detected in the circuit when no voltage should be present.Conditions that could cause this diagnostic code to be activated are listed below:
The energize circuit of the solenoid is shorted to another voltage source.
The switch panel has failed. A failure of the switch panel is unlikely.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: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes. Clear any created diagnostic codes after the original diagnostic code has been corrected.System Response:A Level 2 warning will be generated.Note: The resistance specification for the solenoid coil is 26.96 1.60 Ohms at 20° 5°C (68° 9°F).Test Step 1. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the machine harness connector from the solenoid. Disconnect the machine harness connectors C1, C13, and C2 from the switch panel.
At the harness connectors of the switch panel, measure the resistance from contact C2-13 (wire 779-WH) to all of the other contacts that are used in the J1 and J2 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 resistance measurement does not indicate a short in the machine harness. Proceed to Test Step 2.
NO - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. Repair: The short is between wire 779-WH and the circuit that has a low resistance measurement.
For information on testing for short circuits and finding short circuits, refer to Testing and Adjusting, "Wiring Harness (Short Circuit) - Test". Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE OPERATION OF THE ECMThe disconnect switch and the key start switch remain in the OFF position. The machine harness connectors for the solenoid and the switch panel remain disconnected.
At the harness connector of the switch panel C2, use a 151-6320 Removal Tool to remove the energize wire of the solenoid 779-WH and the socket at contact C2-13 from the harness connector.
Reconnect the machine harness connectors to the switch