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Home >> Subaru >> 2017 >> Legacy 2.5i Limited >> 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.
    AC switch OFF
    Temperature adjustment dial LO (MAX COOL)
    FRESH/RECIRC switch RECIRC
    Air flow control switch VENT
    Fan switch (auto A/C model) 5/7 level
    Fan dial (manual A/C model) 3/4 level
  3. Using the Subaru Select Monitor, check the evaporator sensor.
    NOTE: For detailed operation procedures, refer to "Application help".
    1. Connect the Subaru Select Monitor.
    2. On «Start» display, select «Diagnosis».
    3. On «Vehicle selection» display, enter vehicle information and select «Confirmed».
    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 Target».
    7. Idle the engine for 15 minutes, and then compare the air flow outlet temperature with «Evaporator Temperature Target».

      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 Target» 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.

      Preparation tool: 

      Circuit tester 

      Fig 1: Measuring Resistance Between Evaporator Sensor Connector Terminals
      G08546108Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. Inspection conditions Standard
      1 - 2 -20°C 13.584 - 14.541 kΩ
      -15°C 10.34 - 10.946 kΩ
      -10°C 7.938 - 8.313 kΩ
      -5°C 6.143 - 6.366 kΩ
      0°C 4.79 - 4.914 kΩ
      5°C 3.718 - 3.829 kΩ
      10°C 2.889 - 3.031 kΩ
      15°C 2.247 - 2.435 kΩ
      20°C 1.785 - 1.952 kΩ
      25°C 1.427 - 1.574 kΩ
      30°C 1.149 - 1.278 kΩ
      35°C 0.931 - 1.044 kΩ
      40°C 0.759 - 0.858 kΩ
    3. Is the resistance within the standard?
      • Yes  → Evaporator sensor is normal.
      • No  → Replace the evaporator sensor.
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