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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 6 (HYBRID ENERGY STORAGE SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0A95CIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C

Circuit/System Testing

2009 Chevrolet Tahoe Base, 4.8 CSECTION 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. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling .
  2. Test for infinite resistance between the HV terminals 1 X3 and 2 X3 of the manual disconnect lever, in order to verify that the fuse is open.
    • If not the specified value, test the HVIC circuit for a wire to wire short on the HVIC source and return circuits between the X350 and the HV manual disconnect lever connector. Inspect the high voltage cables internal to the battery assembly for proper connections. If all circuits test normal, replace the drive motor generator battery assembly.
  3. Disconnect the X1 and X2 HV DC cables from the battery assembly.
  4. Visually inspect all HV DC cables for damage or conditions that may have caused them to short together. Inspect the high voltage cables between the drive motor generator battery and the drive motor generator control module, and between the drive motor generator control module and the air conditioning compressor.
    • If any of the HV cables are damaged, replace the damaged HV DC cables.
  5. Connect the EL-48458  at the drive motor generator battery assembly. Refer to the EL-48458  installation procedure located in High Voltage System Diagnosis (EL-48458) .
  6. Connect the 12 V battery. Refer to Battery Negative Cable Disconnection and Connection . Install a new HV manual disconnect lever.
  7. Ignition ON, attempt to precharge the HV system by moving the HV contactor relay switch on the tester to the closed position. Verify that the Hi-voltage circuit LED for Hi-voltage greater than 60 volts illuminates and stays illuminated. Wait 3 minutes. Verify the HV fuse does not open and that the precharge does not fail.
    • If the fuse opened or if the precharge failed, inspect the HV cables inside the battery assembly for damage or conditions that may have caused them to short together. Repair or replace the drive motor generator battery assembly.
  8. Ignition OFF, disable the high voltage at the drive motor generator control module assembly. Refer to High Voltage Disabling .
  9. Disconnect the X4 and X5 air conditioning control module (ACCM) cables and the X2 and X3 HV DC cables from the power inverter module (PIM).
  10. With the HV DC cables disconnected from the battery assembly and at the PIM, test for infinite resistance between the HV+ circuit terminal X2 and HV- circuit terminal X3 of the HV DC cables.
    • If less than the specified value, replace the HV DC cables.
  11. Connect the X2 and X3 HV DC cables to the PIM and the X1 and X2 HV DC cables to the battery assembly. Leave the X4 and X5 ACCM cables disconnected.
  12. Temporarily install the PIM high voltage distribution cover and drive motor generator control module sight shield.
  13. Connect the 12 V battery. Refer to Battery Negative Cable Disconnection and Connection .
  14. With the ACCM cables disconnected, install the HV manual disconnect lever. Start the engine, and operate the vehicle. Verify the HV fuse does not open and that the precharge does not fail.
    • If the fuse opened or if the precharge failed, replace the drive motor generator control module.
  15. If all circuits test normal, replace the ACCM.
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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.