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Circuit / System Testing

  1. Ignition OFF, disconnect the harness connector at the generator.
  2. Ignition ON, engine OFF, connect a test lamp to battery positive voltage and repeatedly probe the generator field duty cycle circuit, harness side while monitoring the GEN-F Terminal Signal Parameter in the ECM data list. It should change from 0 percent to above 95 percent.
    • If the parameter was not affected by the test lamp, test the signal circuit for a short to voltage, short to ground or an open / high resistance. If the circuit tests normal, replace the ECM.
  3. If the circuit tests normal during the Ignition ON / RUN tests, and the ECM parameter changed from 0 percent to above 95 percent, replace the generator.
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