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Home >> Cadillac >> 2018 >> CT6 Plug-In >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Automatic >> Diagnostic Information and Procedures >> DTC P0534 >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    The following conditions listed below must be met before performing this procedure.

    • Vehicle must have had a cool down period of at least 2 hours in a cool area to allow A/C pressures and temperatures to equalize.
    • Ensure the high voltage battery is charged to at least 50% to prevent the engine from starting.
    • Ensure the vehicle hood is open with the hood latch closed to prevent the engine from starting.
  1. Install the GE-48800 CoolTech A/C Recharge Machine, vehicle in Service Mode.
  2. Verify the low side pressure reading on the Air Conditioning Service Center is within 3% of the scan tool A/C Low Side Pressure Sensor parameter.
    • Go to next step: If the reading is within 3% 
  3. Verify the high side pressure reading on the Air Conditioning Service Center is within 3% of the scan tool A/C High Side Pressure Sensor parameter.
    • Go to next step: If the reading is within 3% 
  4. Verify the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor 1 parameter is within 3% of ambient temperature.
    • Go to next step: If the reading is within 3% 
  5. Verify the A/C System is operating correctly, refer to Air Conditioning (A/C) System Performance Test .
  6. Vehicle ON, A/C ON.
  7. Perform the Hybrid/EV Battery Pack Active Cooling command function with a scan tool.
  8. Verify the scan tool Hybrid/EV Battery Pack Coolant Pump Speed parameter is greater than 90%
    • Go to next step: If the parameter is 100% 
    9. NOTE:

    Hybrid/EV Battery Pack Coolant Temperature Sensor parameters and ambient air temperature must be above 18°C (64°F) before performing the next procedure.

  9. Verify both the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor parameters drop at least 6°C (11°F) after 20 min.
    • If the parameters do not drop at least 6°C (11°F) 
    1. Pinch off or restrict the coolant valve to radiator hose and the coolant valve bypass hose.
    2. Verify both the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor parameters drop at least 6°C (11°F) after 20 min.
      • If the parameters do not drop at least 6°C (11°F), replace the Drive Motor Battery Coolant Cooler.
      • If the parameters drop at least 6°C (11°F), replace the Q65 Hybrid/EV Battery Pack Coolant Control Valve.
    • Go to next step: If the parameters drop at least 6°C (11°F) 
  10. Clear all codes in the K114B Hybrid Powertrain Control Module 2 using a scan tool.
  11. Verify DTC P0534 does not set while operating the HVAC system under the Conditions for Running the DTC.
    • If the DTC is set 

      Replace the K114B Hybrid Powertrain Control Module 2.

    • Go to next step: If the DTC is not set 
  12. All OK.
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