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Home >> Chevrolet >> 2007 >> Impala SS >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC P0622 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the generator.
  2. Ignition ON, and the 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 ECM 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, or an open circuit. If the circuit tests normal,replace the ECM.
  3. If the circuit tests normal during the Ignition On / Run tests,and ECM parameter changed from 0 percent to above 95 percent replace the generator.
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