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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1383 (Hybrid Controls - DTC P0AFF To DTC P16F9) >> DTC P0C05 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
    The High Voltage Disabling procedure will perform the following tasks:
    • Identify how to disable high voltage.
    • Identify how to test for the presence of high voltage.
    • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

    Failure to follow the procedures exactly as written may result in serious injury or death.
  1. Disable the high voltage for servicing at the drive motor generator control module assembly cable connections. Refer to High Voltage Disabling .
  2. Inspect for damaged 3 phase cables between the drive motor generator power inverter control module (PIM) and the transmission.
    • If damage is observed, replace the 3 phase cables.
  3. Remove the 3 phase cable assembly from the PIM distribution box. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
  4. Test the resistance of each phase by measuring between the following circuits with a DMM.
    • Phase U and phase V
    • Phase U and phase W
    • If you measure 0.5 ohms or less replace the drive motor generator assembly and retest for the DTC. If the DTC resets, replace the PIM.
    • If you measure greater than 0.5 ohms continue with diagnosis.
  5. Remove the 3 phase cable assembly cover from the transmission and inspect the 3 phase cable terminal fasteners for the proper torque and for arc-flash damage. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
    • If any fasteners were loose and no arc-flash damage is present, torque the fasteners and re-assembly the vehicle. Retest for the DTC.
    • If any fasteners were loose and arc-flash damage is present, replace the drive motor generator assembly and the 3 phase cable assembly.
  6. Disconnect the 3 phase cable assembly from the transmission.
  7. Test each cable for continuity from the PIM connection terminal to the transmission connection terminal.
    • If you measure greater than 0.5 ohms, replace the 3 phase cable assembly.
    • If you measure 0.5 ohms or less replace the drive motor generator assembly.
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