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Home >> Subaru >> 2009 >> Impreza WRX STi >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (STI) >> Engine Coolant Temperature Sensor >> Inspection

Engine Coolant Temperature Sensor: Inspection

  1. Immerse the engine coolant temperature sensor and a thermometer in water.
    CAUTION: Take care not to allow water to get into the engine coolant temperature sensor connector. Completely remove any water inside.
    Fig 1: Identifying Immerse Engine Coolant Temperature Sensor And Thermometer In Water
    G06344639Courtesy of SUBARU OF AMERICA, INC.
  2. Raise water temperature gradually, measure the resistance between the engine coolant temperature sensor terminals when the temperature is 20°C (68°F) and 80°C (176°F).
    NOTE: Agitate the water for even temperature distribution.
    Fig 2: Measuring Resistance Between Engine Coolant Temperature Sensor Terminals
    G06344640Courtesy of SUBARU OF AMERICA, INC.
    RESISTANCE REFERENCE CHART

    Water temperature Terminal No. Standard
    20°C (68°F) 1 and 2 2.45 ± 0.2 kΩ
    80°C (176°F) 0.318 ± 0.013 kΩ
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