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Circuit/System Testing

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