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.

Preparations:

Perkins EST 2023A & 2022A & 2019A Software Free Download
Perkins SPI2 2018A EPC+Service Manual Free Download
Perkins Communication Adapter 3

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.