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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1220 (Hybrid Engine Control System) >> Diagnostic Information and Procedures >> DTC P0BFD or P0BFE >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. 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. Perform the High Voltage Disabling procedure for servicing at the drive motor generator control module cable connections.
  2. Remove the 3-phase cable assembly from the PIM distribution box. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
  3. Test the resistance to ground for each phase of the applicable drive motor generator by measuring between the following points with a DMM. You should measure infinite resistance.
    • Phase U terminal and chassis ground
    • Phase V terminal and chassis ground
    • Phase W terminal and chassis ground
    • If infinite resistance is measured, replace the PIM and retest for DTCs. If P0BFD or P0BFE resets, replace the 3-phase cable assembly and the drive motor generator assembly that corresponds to the set DTC.
    • If less than the specified value, continue with Circuit/System Testing.
  4. Remove the 3-phase cable assembly from the transmission. Refer to Generator Control Module 3-Phase Cable Assembly Replacement . Ensure the terminals are not contacting chassis ground.
  5. Retest the resistance to ground for each phase of the 3-phase cable. Measure between the following points with a DMM. You should measure infinite resistance.
    • Phase U terminal and chassis ground
    • Phase V terminal and chassis ground
    • Phase W terminal and chassis ground
    • If infinite resistance is measured, replace the applicable drive motor generator.
    • If less than the specified value, replace the generator control module 3-phase cable assembly.
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