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Home >> Saturn >> 2007 >> Relay 3.9 1 >> Repair and Diagnosis >> External Pages >> Different car >> Section 23 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P0622 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Outlook. However, it is still accessible from the selected car via links, so may be relevant.
  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 the ECM parameter changed from 0 percent to above 95 percent, replace the generator.
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