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| Illustration 1 | g02700461 |
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Schematic of the System Voltage | |
This diagnostic code is recorded when the ECM reads the system voltage as being greater than 32 VDC.
The possible causes of this diagnostic code are listed below:
- A charging system component has failed.
- The wiring of the machine harness has failed.
- The ECM has failed (unlikely).
Test Step 1. CHECK THE CHARGING SYSTEM
- Turn the disconnect switch and the key start switch to the ON position.
- Place CID 0168 FMI 03 on hold.
- View the status of the diagnostic code.
Expected Result:
The diagnostic code is NO longer active.
Results:
- YES - The diagnostic code is NO longer active. Proceed to Test Step 2.
- NO - The diagnostic code remains active. Proceed to Test Step 3.
Test Step 2. CHECK THE CHARGING SYSTEM AGAIN
- Start the engine.
- Place CID 0168 FMI 03 on hold.
- View the status of the diagnostic code.
Expected Result:
The diagnostic code is NO longer active.
Results:
- YES - The diagnostic code is NO longer active. Watch for a recurrence.
STOP
- NO - The diagnostic code is active. The charging system is charging at an excessive voltage.
Repair: Check the charging system. See Special Instruction, REHS0354, "Charging System Troubleshooting" for more information.
STOP
Test Step 3. CHECK THE BATTERY VOLTAGE
- Ensure that the engine is not running.
- At the battery, measure the voltage of the battery.
Expected Result:
The voltage should measure less than 32 VDC.
Results:
- YES - The voltage measures less than 32 VDC. The ECM must be recording this diagnostic code incorrectly. The ECM may have failed.
Repair: An ECM failure is unlikely. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is NOT found, replace the ECM. See Testing and Adjusting, "Module - Replace".
STOP
- NO - The voltage measurement is greater than 32 VDC. The charging system is charging at an excessive voltage.
Repair: Check the charging system.
STOP