938G Wheel Loader, 938G Series II Wheel Loader, IT38G Integrated Toolcarrier and IT38G Series II Integrated Toolcarrier Traction Control System MID 028 - CID 0168 - FMI 00 Caterpillar

Conditions Which Generate This Code:

This diagnostic code is associated with the electrical system voltage. The FMI 00 means that the ECM has determined that the voltage of the electrical system is above 35 DCV.

The possible causes of this diagnostic code are listed below.

• The charging system is not operating properly.

• The signal is shorted to the + battery circuit.

• The ECM has failed.

System Response:

The Traction Control System is not operable.

Note: Ensure that the diagnostic code of CID 0168 FMI 00 is active before performing this procedure.

Test Step 1. VERIFY THAT THE DIAGNOSTIC CODE IS STILL ACTIVE.

1. Turn the key start switch to the ON position.

2. Ensure that CID 0168 FMI 00 is active. See Troubleshooting, "Using AVSpare Electronic Technician to Determine Diagnostic Codes".

3. Ensure that the diagnostic code is active.

Expected Result:

The diagnostic code is active.

Results:

• YES - The diagnostic code is active. Proceed to test step 3.

• NO - The diagnostic code is not active. Proceed to test step 2.

Test Step 2. CHECK THE CHARGING SYSTEM.

1. Start the engine.

2. Ensure that CID 0168 FMI 00 is active.

3. Observe the status of the diagnostic code indicator.

Expected Result:

The diagnostic code indicator is active.

Results:

• YES - The diagnostic code indicator is active. The charging system is charging at an excessive voltage.

  Repair: Check the charging system. See Special Instruction, REHS0354, "Starting and Charging System".

  Stop.

• NO - The diagnostic code indicator is not active.

  Repair: There is no problem at this time. Watch for a recurrence of this diagnostic code.

  Stop.

Test Step 3. CHECK THE BATTERY VOLTAGE.

1. The engine is stopped.

2. At the battery, measure the voltage.

Expected Result:

The voltage is less than 35.0 DCV.

Results:

• OK - The voltage is less than 35.0 DCV. The ECM must be incorrectly recording this problem.

  Repair: It is unlikely that the ECM has failed. Perform the previous Steps again. If the cause of the problem is not found, replace the ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  Stop.

• NOT OK - The voltage is greater than 35.0 DCV. The charging system is charging at an excessive voltage.

  Repair: Check the charging system. See Special Instruction, REHS0354, "Starting and Charging System" .

  Stop.