SPACER-BEARING 6Y9054 - Caterpillar

Illustration 1 g02139336
The Swing Brake Solenoid is located on the underside of the main control valve and behind the swing bearing.
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Schematic of the "Swing Brake" solenoid
This diagnostic code is associated with the "Swing Brake" solenoid. The FMI 05 diagnostic code means that the Machine ECM has determined that an open in the circuit exists. The possible causes of this diagnostic code are listed below:
The energize circuit of the solenoid is open.
The return circuit of the solenoid is open.
The solenoid has failed.
The Machine ECM has failed. A failure of the ECM 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 0374 FMI 05 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.Test Step 1. CHECK THE SOLENOID.
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Disconnect the solenoid with the active diagnostic code from the machine harness.
At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire K906-GN(Green)) to contact 2 (wire 235-BK(Black)).
Observe the status of the CID 0374 FMI 05 diagnostic code. Expected Result:The CID 0374 FMI 05 diagnostic code remains active. Results:
YES - The diagnostic code remains active. The jumper wire does not affect the diagnostic code. Proceed to Test Step 2.
NO - The diagnostic is no longer active. The solenoid has failed.Repair: The solenoid has failed. Repeat this Test Step "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid. Verify that the new solenoid corrects the problem.STOPTest Step 2. CHECK THE HARNESS FOR AN OPEN.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connectors from the Machine ECM.
The jumper wire that was installed in the previous Test Step remains in place.
At the machine harness connector, measure the resistance from signal contact J1-3 (wire K906-BU(Blue)) to contact J1-2 (wire 235-BK(Black)). Expected Result:The resistance is less than 5 ohms.Results:
OK - The resistance is less than 5 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - The resistance is greater than 5 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness.Repair: The open is in wire K906-BU(Blue) or wire 235-BK(Black) of the machine harness. Check the continuity of each segment of the circuit. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS
Inspect the contacts of the harness connectors. Clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the CID 0374 FMI 05 diagnostic code. Expected Result:The CID 0374 FMI 05 diagnostic code is active. Results:
YES - The CID 0374 FMI 05 diagnostic code is active. The diagnostic code has not been