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| Illustration 1 | g01252077 |
Parking brake solenoid | |
This diagnostic code is associated with the park brake solenoid valve. The FMI 06 means that the ECM has determined that the current of the solenoid is above normal.
The possible causes of this diagnostic code are listed:
- The energize circuit of the solenoid is shorted to ground.
- The solenoid has failed.
- The ECM has failed. ECM failure 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 0681 - FMI 06 is active before performing this procedure.
Note: Use a calibrated 146-4080 Digital Multimeter for the measurements in this procedure.
System Response:
When this diagnostic code occurs, the action lamp is on. The park brake will not release if there is an open circuit or short-to-ground on this solenoid.
Test Step 1. CHECK THE SOLENOID.
- Turn the disconnect switch and the keyswitch to the OFF position.
- Disconnect the solenoid with the active diagnostic code from the harness.
- Check the resistance of the solenoid with the digital multimeter.
Expected Result:
The resistance of the solenoid is more than 100 ohms.
Results:
- YES - The resistance of the solenoid is more than 100 ohms. Proceed to Test Step 2.
- NO - The resistance of the solenoid is less than 100 ohms. The solenoid has failed.
Repair: The solenoid has failed. Replace the solenoid. Verify that the new solenoid corrects the problem.
STOP
Test Step 2. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO GROUND.
- Turn the keyswitch and the disconnect switch to the OFF position.
- The solenoid remains disconnected from the harness.
- Disconnect the harness connectors from the ECM.
- At the harness connector, measure the resistance from the signal contact J1-61 (wire A958-WH) to all contacts that are used in the harness connectors for the ECM.
Expected Result:
Each resistance is greater than 5000 ohms.
Results:
- OK - Each resistance is greater than 5000 ohms. The harness is correct. Proceed to Test Step 3.
- NOT OK - Each resistance is not greater than 5000 ohms. There is a short in the harness. The short is between J1-61 (wire A958-WH) and the circuit with the low resistance.
Repair: Repair or replace the harness.
STOP
Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
- Inspect the harness connectors and clean the contacts of the harness connectors.
- Reconnect all harness connectors.
- Turn the disconnect switch and the keyswitch to the ON position.
- Operate the machine.
- Check the status of the CID 0681 - FMI 06.
Expected Result:
The CID 0681 - FMI 06 is not active.
Results:
- NO - The CID 0681 - FMI 06 is active. The diagnostic code has not been corrected. The ECM may have failed, however, ECM failure is unlikely.
Repair: Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, contact the technical communicator at your Caterpillar dealer. If the ECM must be replaced, refer to the Testing and Adjusting, "Electronic Control Module (ECM) - Replace" section of this manual.
STOP
- YES - The CID 0681 - FMI 06 is not active. The diagnostic code does not exist at this time.
Repair: The diagnostic code was probably caused by a poor connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.
STOP