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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the generator.
  2. Ignition ON, engine OFF, observe the scan tool ECM GEN-F Terminal Signal parameter. It should display less than 10 percent.
    • If the GEN-F Terminal Signal parameter was not affected by the disconnected generator harness, test the GEN-F Terminal Signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the ECM.
    • If the circuit tested normal and the ECM parameter changed from above 65 percent to less than 10 percent, replace the generator.