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.
- 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.
- 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.
- 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.
- Inspect Wiring and Connectors:
- Look for damaged wiring or loose connectors between the battery and ECM that could cause intermittent voltage supply.
- ECM Power Supply Check:
- Verify the power supply to the ECM is consistent and within the required voltage range.
- 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.
- Check Alternator Output:
- Ensure the alternator is providing a consistent charge to the battery. An underperforming alternator can lead to low voltage issues.
- 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.