Solution for Perkins 1106D Electric Power Generation with CID 0168 and FMI 02

The article share outlines a diagnostic issue and a troubleshooting approach for a specific fault code (CID 0168 FMI 02) on a Perkins 1106D Electric Power Generation engine. This fault is associated with intermittent battery circuit voltage to the Electronic Control Module (ECM) while the engine is running. Here’s a structured approach to address this issue based on the conditions and system response you’ve described:

Conditions Which Generate This Code:

  • The ECM detects three voltage readings below 6 Volts DC within 7 seconds, and the voltage then increases to more than 9 Volts DC.
  • The keyswitch is in the ON position, the engine is running, and it is not in the cranking phase.


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System Response:

  • The ECM logs a diagnostic code, and, if equipped, the diagnostic lamp may flash.
  • If the battery voltage drops without recovery, the ECM won’t log the diagnostic code, leading to engine shutdown, depending on how long the fault occurs.

Possible Performance Effects:

  • Potential changes in engine RPM.
  • Intermittent or complete engine shutdowns.
  • Fuel injection by the ECM may stop depending on the duration of the fault.

Troubleshooting Steps:

  1. Ignition Keyswitch Circuit and Battery Supply Circuit – Test:
    • This test focuses on ensuring there’s a consistent voltage supply from the battery to the ECM and that the ignition keyswitch circuit is functioning properly.
  2. Check Battery Connections and Voltage:
    • Ensure all battery connections are secure and free of corrosion.
    • Test the battery voltage to confirm it’s within the specified range for normal operation.
  3. Inspect Wiring and Connectors:
    • Look for damaged wiring or loose connectors between the battery and ECM that could cause intermittent voltage supply.
  4. ECM Power Supply Check:
    • Verify the power supply to the ECM is consistent and within the required voltage range.
  5. Load Test the Battery:
    • Perform a load test on the battery to ensure it can hold a charge under load conditions, as a weak battery might not supply adequate voltage to the ECM.
  6. Check Alternator Output:
    • Ensure the alternator is providing a consistent charge to the battery. An underperforming alternator can lead to low voltage issues.

Additional Recommendations:

  • Software Update: Ensure the ECM software is up to date. Sometimes, software updates can resolve underlying issues not apparent during hardware checks.
  • Perkins Diagnostic Tools: Utilize Perkins EST (Electronic Service Tool) and SPI2 (Service and Parts Information) for advanced diagnostics and to ensure all components are operating within their design specifications.
More trouble repair case for Perkins,pls refer to:Perkins Trouble Repair

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