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Circuit/System Testing

  1. Ignition OFF, disconnect the generator harness connector.
  2. The 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 data list, it should change from 0 percent to above 95 percent.
    • If the GEN-F Terminal Signal parameter was not affected by the test lamp, test the GEN-F Terminal Signal circuit for a short to voltage, short to ground, a high resistance, an open circuit. 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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