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Home >> Saturn >> 2007 >> Sky Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P1668 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac Montana SV6, 2007 Chevrolet Uplander, and 2007 Buick Terraza. 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, test for less than 1 volt between the generator turn ON signal and ground.
    • If greater than the specified range, test the generator turn ON signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  3. Engine running, test for greater than 3.5 volts between the generator turn ON signal and ground.
    • If less than the specified range, test the generator turn ON signal circuit for a short to ground, an open, or a high resistance. If the circuit tests normal, replace the ECM.
  4. If the circuit tests normal during the Ignition ON/Run tests, replace the generator.
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