CID 0168 FMI 01 Electrical System Voltage Below Normal Range - Test
This diagnostic code is recorded when the Automatic Retarder Control (ARC) detects a battery voltage of less than 24 DCV. This means that "A1" contact was at less than 24 DCV for more than 20 seconds.
Determine if a battery charger or a welder is being used on the machine. Disconnect the charger or the welder if one is used. Recheck for the diagnostic code. Ensure that the CID 168 / FMI F01 is on hold and that the fault is still present.
- CHECK THE BATTERY VOLTAGE.
- Turn the key start switch to the OFF position.
- Measure the battery voltage at the battery posts.
Expected Results: The voltage should be 24 VDC.
Results:
- OK: The ARC could be faulty. Recheck the system before replacing the ARC. The ARC is seldom the cause of a diagnostic code. Proceed to Step 2.
- No: Replace the battery. If the fault continues proceed to STEP 3.
- OK: The ARC could be faulty. Recheck the system before replacing the ARC. The ARC is seldom the cause of a diagnostic code. Proceed to Step 2.
- CHECK THE SYSTEM VOLTAGE AT THE ARC.
- Measure the system voltage at connector A between the contacts 1 and 2. The engine must be running at high idle.
Expected Result: The voltage is 24 VDC.
Results:
OK: The voltage is 24 VDC.
No: Fix the harness by repairing or replacing the harness. If conditions are not resolved proceed to Step 3.
- Measure the system voltage at connector A between the contacts 1 and 2. The engine must be running at high idle.
- CHECK THE ALTERNATOR.
- Start the engine and run the engine at a high idle for several minutes.
- Measure the voltage output at the battery posts.
Expected Results: The voltage should be 27 VDC to 29 VDC.
Results:
- OK: The battery may be faulty. Proceed to Step 1.
- No: Repair the alternator or replace the alternator. The voltage regulator is faulty. If conditions are not resolved, proceed to 1.
- OK: The battery may be faulty. Proceed to Step 1.
- VERIFY THE FAILURE.
- The ARC could be faulty. Recheck the system before replacing the ARC. The ARC is seldom the cause of a diagnostic code.
- Control replacement must be done in a specific manner. Specific instructions should be followed. Refer to Testing And Adjusting, "ARC - Replace".
Expected Results: The original condition no longer exists. STOP.
Results:
- OK: The original problem is no longer a fault condition. STOP.
- No: Recheck the system because the original condition still exists. STOP.
- OK: The original problem is no longer a fault condition. STOP.
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