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Circuit/System Verification

WARNING: This page is about a different car, the 2018 Chevrolet Trax and 2018 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, verify that DTC P0480, P0691, or P0692, is not set.
    2. NOTE:

    There is a slight delay before the cooling fan activates and reaches full speed.

  2. Command the cooling fan ON from 20 - 90 % with a scan tool. Verify that the cooling fan turns ON and operates as commanded.
    • If the cooling fan does not respond to the commanded states, refer to Cooling Fan Inoperative  for further diagnosis.
  3. Ignition ON, command the KR31 auxiliary coolant pump relay ON and OFF with the scan tool. An audible click should be heard when changing between the commanded states.
  4. Command the KR31 auxiliary coolant pump relay ON and OFF while observing the scan tool parameters listed below:
    • Auxiliary Coolant Pump Relay Control Circuit Open Test Status
    • Auxiliary Coolant Pump Relay Control Circuit Low Voltage Test Status
    • Auxiliary Coolant Pump Relay Control Circuit High Voltage Test Status

      Each of the parameters should display OK or Not Run when changing between the commanded states.

  5. Start the engine, observe the DTC information with a scan tool. DTCs P2600, P2602, or P2603 should not set.
    • If a DTC is set, refer to Circuit/System Testing for further diagnosis.
  6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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