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Home >> Subaru >> 2021 >> WRX Base >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System (Heater, Ventilator And A/C) (Service Information) >> Evaporator Sensor >> Inspection

Evaporator Sensor: Inspection

  1. Prepare the vehicle.
    NOTE: Check that the ambient temperature is 25 - 40°C (77 - 104°F) and that the humidity is 30% - 80%.
    • Place the vehicle in the workshop or in the shade and windless condition.
    • Open all windows.
  2. Set the vehicle to the following conditions.
    Item Condition
    Engine Idling
    Air vent grille Shutter is fully open.
    A/C switch OFF
    Temperature adjustment dial LO (MAX COOL)
    FRESH/RECIRC switch RECIRC
    Air flow control dial or switch VENT
    Fan dial 5/7 level
  3. Using the Subaru Select Monitor, check evaporator temperature.
    NOTE: For detailed operation procedures, refer to "Application help".
    1. On "Start" display, select "Diagnosis".
    2. On "Vehicle selection" display, enter vehicle information and select "Confirmed".
    3. On "Main Menu" display, select "Each System".
    4. On "Select System" display, select "Air Conditioner" and select "Enter".
    5. On "Select Function" display, select "Data Monitor".
    6. From the data monitor item list, select "Evaporator Temperature".
    7. Idle the engine for 15 minutes, and then compare the air flow outlet temperature with "Evaporator Temperature".

      Preparation tool: 

      Thermometer and hygrometer

      NOTE: For outlet opening temperature, measure the average temperature of center grille assembly and side grille assembly.
    8. Do the air flow outlet temperature and "Evaporator Temperature" differ by 3°C (5.4°F) or more?
      • yes  → Go to step  4).
      • no  → Evaporator sensor is normal.
  4. Check the evaporator sensor.
    1. Disconnect the connector.
    2. Measure the resistance between connector terminals.
      CAUTION: During inspection, be careful not to touch the sensor end in order to avoid misjudgment due to body temperature.

      Preparation tool: 

      Circuit tester

      G08542744Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. Inspection conditions Standard
      1 - 2 -20°C 15.37 - 16.62 kΩ
      -15°C 12.09 - 12.87 kΩ
      -10°C 9.576 - 10.05 kΩ
      -5°C 7.636 - 7.899 kΩ
      0°C 6.132 - 6.256 kΩ
      5°C 4.891 - 5.057 kΩ
      10°C 3.928 - 4.113 kΩ
      15°C 3.174 - 3.366 kΩ
      20°C 2.581 - 2.77 kΩ
      25°C 2.111 - 2.292 kΩ
      30°C 1.737 - 1.907 kΩ
      35°C 1.437 - 1.595 kΩ
      40°C 1.195 - 1.34 kΩ
    3. Replace the evaporator sensor if the inspection result is not within the standard value.
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