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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1860 (Hybrid/EV Control System) >> Diagnostic Information and Procedures >> DTC P1AF8 or P1AFE >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that DTCs P0C01, P0C04, P0BFD, or P0BFE is not set.
    2. 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.

  2. Perform the High Voltage Disabling procedure for servicing at the drive motor generator control module cable connections.
  3. Remove the 3-phase cable assembly from the T6 drive motor generator control module distribution box. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
  4. Test for less than 0.5 Ω between each of the AC circuit terminals listed below:
    • Drive motor 1st position phase U and phase V terminal
    • Drive motor 1st position phase V and phase W terminal
    • Drive motor 2nd position phase U and phase V terminal
    • Drive motor 2nd position phase V and phase W terminal
    • If not the specified value, test the AC circuit for an open/high resistance. If the circuit tests normal replace the appropriate M15 drive motor with generator assembly.
  5. Test for infinite resistance between each of the AC circuit terminals listed below and ground:
    • Drive motor 1st position phase U terminal
    • Drive motor 1st position phase V terminal
    • Drive motor 1st position phase W terminal
    • Drive motor 2nd position phase U terminal
    • Drive motor 2nd position phase V terminal
    • Drive motor 2nd position phase W terminal
    • If not the specified value, test the AC circuit for a short to ground or a short between the AC circuit terminals and the aluminum cable mounting block. If the circuit tests normal replace the appropriate M15 drive motor with generator assembly.
  6. Replace the 3 phase cable assembly and the appropriate M15 drive motor with generator assembly. If the DTC resets replace the T6 drive motor power inverter module.
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