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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 95 (Hybrid/EV Energy Storage System) >> Diagnostic Information and Procedures >> DTC P0ABB, P0ABC, or P0ABD >> Circuit/System Testing

Circuit/System Testing

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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 includes the following steps:

  • 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.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

  • Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.
  • Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
    • Visually and functionally inspect the gloves before use.
    • Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

  1. Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to High Voltage Disabling 
  2. Remove the S15 Manual Service Disconnect.
  3. Test for less than 10 Ω across the S15 Manual Service Disconnect fuse terminals.
    • If 10 Ω or greater 

      Replace the S15 Manual Service Disconnect.

    • Go to next step: If less than 10 Ω 
  4. Remove the A4 hybrid/EV battery pack cover. Refer to High Voltage Battery Cover Replacement .
  5. Disconnect the A28 hybrid/EV battery contactor assembly high voltage connectors X1 positive (300V) and X2 negative (300V).
  6. Install a known good S15 manual service disconnect.
    7. WARNING:

    High voltage circuits should only be tested using a digital multimeter (DMM) and test leads with at least a CAT III rating, such as the J 39200-A Digital Multimeter. Failure to follow the procedures may result in serious injury or death.

    NOTE:

    You are testing high voltage.

  7. Test for 128.5 - 360 V between the X2 negative (300 V) C4A and X1 positive (300 V) C4H battery cable terminals.
    • If not within the specified range 

      Replace the A4 Hybrid/EV Battery Pack. After the repair is complete, perform the Clear Secured High Voltage DTCs  reset function.

    • Go to next step: If within the specified range 
  8. Disconnect the A28 hybrid/EV battery contactor assembly high voltage sense circuit connector X5.
  9. Reconnect the A28 hybrid/EV battery contactor assembly high voltage connectors X1 and X2.
    10. NOTE:

    You are testing high voltage.

  10. Test for 128.5 - 360 V between the X5 terminal 1 negative (300 V) and terminal 2 positive (300 V) at the A28 hybrid/EV battery contactor assembly.
    • If not within the specified range 

      Replace the A28 Hybrid/EV Battery Contactor Assembly or the sense circuit fuse(s) as applicable.

    • Go to next step: If within the specified range 
  11. Remove the S15 manual service disconnect.
  12. Disconnect the K114B hybrid/EV powertrain control module connector X6.
    13. NOTE:

    The A28 hybrid/EV battery contactor assembly high voltage sense lead connector X5 must remain disconnected.

  13. Test for infinite resistance between high voltage sense circuits connector X6 terminals 2 and 7 to ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  14. Test for less than 2 Ω in each voltage sense circuit end to end.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  15. Replace the K114B Hybrid/EV Powertrain Control Module 2.
  16. After the repair is complete, the Clear Secured High Voltage DTCs  reset function must be performed.
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