A CID 500 FMI 12 means that the GSC is unable to accurately measure the AC voltage and the AC current. The engine remains able to run. The engine also remains able to start.
Note: On the GSC, the CID 500 FMI 12 diagnostic code will be shown even when the engine control switch (ECS) is in the OFF/RESET position.
Test Step 1. VERIFY THAT THE DIAGNOSTIC CODE IS ACTIVE.
- The CID 500 FMI 12 is active.
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If a CID 500 FMI 12 occurs and the engine is running, the generator output may be at full voltage potential. This could occur even if the GSC display is showing 0 AC volts and 0 AC current for all three phases. |
Expected Result:
The CID 500 FMI 12 is active.
Results:
- YES - The CID 500 FMI 12 is active.
Repair: Replace the GSC. See Testing And Adjusting, "EMCP Electronic Control (Generator Set) - Replace".
Stop.
- NO - The CID 500 FMI 12 is NOT active.
Repair: The GSC is operating normally.
Stop.