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Circuit/System Testing

  1. Ignition OFF, disconnect the X1 harness connector at the generator.
  2. Ignition ON, verify the scan tool ECM GEN-F Terminal Signal parameter is 0 percent.
    • If greater than the specified value, test the field duty cycle circuit terminal 2 X1 for a short to voltage. If the circuit tests normal, replace the ECM.
  3. Connect a test lamp between the field duty cycle circuit terminal 2 X1 and B+. Verify the scan tool ECM GEN-F Terminal Signal parameter is greater than 95 percent.
    • If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  4. If the circuit tests normal, test or replace the generator.
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