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HOMESERVICE MANUALSGMC2010SAVANA G2500, VAN CARGO EXTENDED, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1628 (HYBRID CONTROLS - 3.6L (HP5) - DTC P16F9 TO DTC P2797)DTC P1AF8 OR P1AFECIRCUIT/SYSTEM TESTING
2010 GMC Savana G2500, Van Cargo Extended, 6.6 6

Circuit/System Testing

2010 GMC Savana G2500, Van Cargo Extended, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Saturn Vue. 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 PIM and the transmission.
    • If damage is observed, replace the 3 phase cables.
  3. Inspect the 3 phase cable terminal fasteners for the proper torque and for arc-flash damage.
    • If any fasteners were loose and no arc flash damage is present, torque the fasteners and re-assemble the vehicle. Retest for the DTC.
    • If any fasteners were loose and arc flash damage is present, replace the PIM and the 3 phase cable assembly.
  4. Remove the 3 phase cable assembly from the PIM distribution box. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
  5. 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 applicable drive motor generator stator assembly and retest for the DTC. If the DTC resets, replace the PIM.
    • If you measure more than 0.5 ohms, continue with diagnosis.
  6. 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-assemble the vehicle. Retest for the DTC.
    • If any fasteners were loose and arc flash damage is present, replace the applicable drive motor generator stator assembly and the 3 phase cable assembly.
  7. Disconnect the 3 phase cable assembly from the transmission. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
  8. 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 applicable drive motor generator stator assembly.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.