This diagnostic code is recorded when the ECM identifies a system voltage that is above 32.5 DCV.
The possible causes of this diagnostic code are listed:
- The voltage regulator is not operating properly.
- Jump starting with a welder.
System Response:
The machine response is listed:
- Implement functions will not work.
- The pilot supply on/off solenoid for the implements will de-energize.
Note: Ensure that CID 0168 FMI 00 is active and that the diagnostic code indicator is active.
Test Step 1. CHECK THE CHARGING SYSTEM
- Turn the key start switch to the ON position.
- Ensure that CID 0168 FMI 00 is active. See Troubleshooting, "Using Caterpillar Monitoring System to Determine Diagnostic Codes".
- Ensure that the diagnostic code indicator is active.
Expected Result:
The diagnostic code indicator is active.
Results:
- YES - The diagnostic code indicator is active. Proceed to test step 3.
- NO - The diagnostic code indicator is not active. Proceed to test step 2.
Test Step 2. CHECK THE CHARGING SYSTEM
- Start the engine.
- Ensure that CID 0168 FMI 0 is active.
- 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. For more information on checking the charging system components, see Troubleshooting, SENR1394, "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
- The engine is stopped.
- At the battery, measure the voltage.
Expected Result:
The voltage is less than 32.5 DCV.
Results:
- OK - The voltage is less than 32.5 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 32.5 DCV. The charging system is charging at an excessive voltage.
Repair: Check the charging system. Refer to the electrical system schematic for your machine. Check the components and circuits that are related to the charging system in order to correct the problem.
STOP