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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 GEN-F Terminal Signal parameter, while repeatedly probing the generator field duty cycle circuit with a test lamp connected to battery positive voltage. The parameter should change from 0 percent to above 95 percent.
    • If the parameter was not affected by the test lamp, test the circuit for a short to ground or an open / high resistance. If the circuit tests normal, replace the ECM.
  3. If the circuit tested normal and the ECM parameter changed from 0 percent to above 95 percent, replace the generator.
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