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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 P0C78 or P3061 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vehicle in Service Mode.
  2. Verify that DTC P0AA1, P0AA4, P0AD9, P0ADB, P0ADC, P0ADD, P0ADF, P0AE0, P0AE4, P0AE6, P0AE7, or P1EC0 is not set.
    • Go to next step: If none of the DTCs are set 
    3. NOTE:

    The following setup steps must be performed exactly in order to exercise the contactors.

  3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
  4. OPEN the driver door using outside door handle. Leave driver door OPEN.
    5. NOTE:

    The brake pedal must remain depressed throughout the remainder of the contactor steps.

  5. PRESS and HOLD the brake pedal.
    6. NOTE:

    DO NOT press the power button and enter Vehicle in Service Mode.

  6. Command the Hybrid/EV Battery Contactors ALL OPEN with a scan tool.
  7. Disconnect the S15 Manual Service Disconnect.
    8. NOTE:

    DO NOT use the scan tool Release Control button to turn OFF any of the contactors. Once the Release Control button is pushed the Circuit/System Verification will need to be restarted from the beginning.

  8. Command the Hybrid/EV Battery Negative Contactor between CLOSED and ALL OPEN with a scan tool while listening for the contactor to open.
    9. NOTE:

    It is normal for the contactors to only make noise while opening.

  9. Verify the Hybrid/EV Battery Negative Contactor is heard opening.
    • If the Hybrid/EV Battery Negative Contactor operation cannot be heard 

      Refer to Circuit/System Testing, Contactor Diagnosis.

    • Go to next step: If the Hybrid/EV Battery Negative Contactor operation is heard 
  10. Command the Hybrid/EV Battery Positive Contactor between CLOSED and ALL OPEN with a scan tool while listening for the contactor to open.
  11. Verify the Hybrid/EV Battery Positive Contactor is heard opening.
    • If the Hybrid/EV Battery Positive Contactor operation cannot be heard 

      Refer to Circuit/System Testing, Contactor Diagnosis.

    • Go to next step: If the Hybrid/EV Battery Positive Contactor operation is heard 
  12. Command the Hybrid/EV Battery Precharge Contactor between CLOSED and ALL OPEN with a scan tool while listening for the contactor to open.
  13. Verify the Hybrid/EV Battery Precharge Contactor is heard opening.
    • If the Hybrid/EV Battery Precharge Contactor operation is not heard 

      Refer to Circuit/System Testing, Contactor Diagnosis.

    • Go to next step: If the Hybrid/EV Battery Precharge Contactor operation is heard 
  14. Release scan tool control. Install the S15 manual service disconnect.
    15. NOTE:

    Turning the vehicle OFF but maintaining scan tool to control module communication will not allow the control module to sleep.

  15. Allow Hybrid/EV powertrain control modules to enter sleep mode by performing the following:
    1. Turn the Vehicle OFF.
    2. Ensure the scan tool is not communicating with any control modules by returning to the Home screen.
    3. Shut all doors. Do NOT depress the brake pedal or activate any vehicle controls such as the parking lights, fuel door release, etc.
    4. Ensure the scan tool is accessible without having to open doors or otherwise cause control module wake-up.
      5. NOTE:

      Sleep mode is usually entered within two minutes after shutting off the vehicle.

    5. Wait 5 minutes with the vehicle in the prescribed condition so that the modules may enter sleep mode.
  16. With a scan tool, verify the Hybrid/EV Powertrain Control Module 2 has gone to sleep by attempting to observe control module data and ensure communication is not present.
    • If communication is present 

      Repeat the previous step.

    • Go to next step: If communication is not present 
  17. Vehicle ON. Verify the scan tool hybrid/EV powertrain control module 2 High Voltage Inverter Voltage and Hybrid/EV Battery Pack Voltage are within 10V of each other.
    • If not within 10 V of each other 

      Refer to Circuit/System Testing, System Bus Diagnosis.

    • Go to next step: If within 10 V of each other 
  18. All OK.
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