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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Diagnostic Information and Procedures >> DTC P0597-P0599: Engine Coolant Thermostat Heater Control Circuit (LUJ or LUW) >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify the scan tool parameters listed below do not display Malfunction while commanding the Engine Coolant Thermostat Heater to increase 100% and then decrease to 0%.
    • Engine Coolant Thermostat Heater Control Circuit Low Voltage Test Status
    • Engine Coolant Thermostat Heater Control Circuit Open Test Status
    • Engine Coolant Thermostat Heater Control Circuit High Voltage Test Status
    • If Malfunction is not displayed 
  3. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
  4. Verify the DTC does not set.
    • If the DTC does not set 
  5. All OK.
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