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Circuit/System Testing

  1. Ignition OFF, disconnect the generator harness X1 connector.
  2. Ignition ON, connect a test lamp to battery positive voltage and repeatedly probe the generator field duty cycle signal circuit, harness side terminal 2, while monitoring the GEN-F Terminal Signal Parameter in the ECM data list with a scan tool. Verify that the scan tool parameter changes from 0 percent to greater than 95 percent.
    • If the GEN-F Terminal Signal scan tool parameter was not affected by the test lamp, then test the generator field duty cycle signal circuit for a short to voltage, a short to ground, a high resistance, or an open circuit. If OK, then replace the ECM.
  3. If the circuit tests normal, then replace the generator.
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