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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P00B7, P0597-P0599, or P2181 - E41 Engine Coolant Thermostat Heater Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC P00B3, P00B4, P00B6, P0116, P0117, P0118, P0119, P0128 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Verify DTC P00B7, P2181 is not set.
    • If any of the DTCs are set 

      Refer to:Circuit/System Testing

    • Go to next step: If none of the DTCs are set 
  4. Perform the scan tool control function: Cooling Fan - From 0 to 90% and back to 0%.

    Verify the component turns On and Off:G10 Cooling Fan Motor

    • Go to next step: If the component turns On and Off 
  5. Perform the scan tool control function: Engine Coolant Thermostat Heater - On and Off

    Verify the scan tool parameter:

    • Engine Coolant Thermostat Heater Control Circuit High Voltage Test Status = OK or Not Run
    • Engine Coolant Thermostat Heater Control Circuit Low Voltage Test Status = OK or Not Run
    • Engine Coolant Thermostat Heater Control Circuit Open Test Status = OK or Not Run
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  6. Ignition/Vehicle - Off
    7. NOTE:

    Depending on ambient temperature, it may take up to 8 h to reach the specified temperature.

  7. Ignition - On / Vehicle - In Service Mode

    Verify the following parameters are within 5°C (9°F) of each other:

    • Ambient Air Temperature
    • ECT Sensor
    • If not within 5°C (9°F) of each other 

      Repeat step 6 - Wait until the conditions are met

    • Go to next step: If within 5°C (9°F) of each other 
  8. Perform the following action:
    • HVAC Controls - Off
    • Hood - Closed
  9. Engine - Idling

    Verify the scan tool parameter: ECT Sensor =

    • {Ambient Air Temperature = 10°C (50°F)}Greater than 90°C (194°F) - Within 26 min
    • {Ambient Air Temperature = 20°C (68°F)}Greater than 90°C (194°F) - Within 22 min
    • {Ambient Air Temperature = 27°C (80°F)}Greater than 90°C (194°F) - Within 18 min
    • If 90°C (194°F) or colder 

      Test or replace the component: E41 Engine Coolant Thermostat Heater

    • Go to next step: If warmer than 90°C (194°F) 
  10. Perform the scan tool control function: Engine Coolant Thermostat Heater and Cooling Fan
    1. Engine Coolant Thermostat Heater - 100%
    2. Cooling Fan - 90%
    3. Engine Speed - 1, 800 to 2, 200 RPM
    • Verify the scan tool parameter: ECT Sensor = Less than 85°C (185°F) - Within 5 min
    • If 85°C (185°F) or warmer 

      Refer to:Circuit/System Testing

    • Go to next step: If colder than 85°C (185°F) 
  11. Perform the scan tool control function: Engine Coolant Thermostat Heater and Cooling Fan
    1. Engine Coolant Thermostat Heater - 0%
    2. Cooling Fan - 0%
    3. Engine Speed - 1, 800 to 2, 200 RPM
    • Verify the scan tool parameter: ECT Sensor = Greater than 102°C (215°F) - Within 5 min
    • If 102°C (215°F) or colder 

      Test or replace the component: E41 Engine Coolant Thermostat Heater

    • Go to next step: If warmer than 102°C (215°F) 
  12. {If a DTC was not set - Refer to the next step}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.
    • If the DTC sets 

      Refer to: Circuit/System Testing

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