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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Hybrid/EV Control System) >> Diagnostic Information and Procedures >> DTC P0C05: Drive Motor Phase U-V-W Circuits >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    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.
  2. Verify the 3-phase drive motor generator battery cable terminal fasteners at the K59 Starter/Generator Control Module are properly torqued and do not have arc-flash damage.
    • If any fasteners are loose and no arc-flash damage is present 

      Torque the fasteners and re-assemble the vehicle.

    • If any fasteners are loose and arc-flash damage is present 

      Replace the damaged component or components.

    • If all fasteners are properly torqued and no arc-flash damage is present 
  3. Remove the 3-phase drive motor generator battery cable cover at the A15 Starter Generator.
  4. Verify the 3-phase drive motor generator battery cable terminal fasteners at the A15 Starter Generator are properly torqued and do not have arc-flash damage.
    • If any fasteners are loose and no arc-flash damage is present 

      Refer to Internal Starter Generator Inspection.

    • If any fasteners are loose and arc-flash damage is present 
    1. Replace the 3-phase drive motor generator battery cable.
    2. Refer to Internal Starter Generator Inspection.
    • If all fasteners are properly torqued and no arc-flash damage is present 
  5. Remove the 3-phase drive motor generator battery cable from the K59 Starter Generator Control Module.
  6. Test for less than 0.5Ω between phases by measuring between the following AC circuit terminals:
    • Phase U and phase V
    • Phase U and phase W
    • Phase V and phase W
    • If 0.5Ω or greater 
    1. Detach the 3-phase drive motor generator battery cable assembly from the A15 Starter Generator.
    2. Test for less than 0.5Ω on each phase of the 3-phase drive motor generator battery cable end to end.
      • If 0.5Ω or greater, replace the 3-phase drive motor generator battery cable.
      • If less than 0.5Ω, replace the A15 Starter Generator.
    • If less than 0.5Ω 
  7. Replace the A15 Starter Generator.
  8. Verify DTC P0C05 does not set.
    • If the DTC sets 

      Replace the K59 Starter/Generator Control Module.

    • If the DTC does not set 
  9. All OK.
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