WASHER 7F7272 - Caterpillar

Illustration 1 g02756357
Schematic of the "Traction Control Selector (TCS) (Left Brake)" solenoid valve
This diagnostic code is associated with the left brake section of theTraction Control Selector (TCS) four-way solenoid valve. The FMI 03 diagnostic code means that the Brake ECM has determined that the voltage of the solenoid circuit is above normal. Possible causes for this diagnostic code are listed below:
The solenoid has failed.
The energize circuit of the solenoid is shorted to the +battery circuit.
The Brake ECM may have failed, but this situation 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 0689 FMI 03 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:The diagnostic code will be logged into memory and the Traction Control Selector (TCS) will be disabled.Test Step 1. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO THE +BATTERY CIRCUIT.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connectors from the solenoid and the Brake ECM.
At the machine harness connector for the ECM, measure the resistance from contact J1-58 (wire 774-YL(Yellow)) 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. Go to Test Step 2.
NO - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between J1-58 (wire 774-YL(Yellow)) and the circuit that has a low resistance measurement. Repair: Repair or replace the machine harness.STOPTest Step 2. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE.
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.
Operate the machine.
Determine if the CID 0689 FMI 03 diagnostic code is active. Expected Result:The CID 0689 FMI 03 diagnostic code is active.Results:
YES - The CID 0689 FMI 03 diagnostic code is active. The problem has not been corrected. The ECM may have failed.Repair: A failure of the Brake ECM is unlikely. Exit this procedure and perform this procedure again. Prior to replacing an ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP
NO - The CID 0689 FMI 03 diagnostic code is not active. The problem does not exist at this time.Repair: The initial diagnostic code was probably caused by a poor electrical connection that was resolved when a connector was disconnected and reconnected. Resume normal machine operation.STOP