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Engine Coolant Temperature Sensor: Inspection

  1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    Fig 1: Engine Coolant Temperature Sensor Resistance Graph
    G04943083Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Partially soak the sensor in water and warm up the water.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      ENGINE COOLANT TEMPERATURE SENSOR

      Tester Connection Condition Specified Condition
      1 - 2 Approx. 20°C (68°F) 2.32k to 2.59 kΩ
      1 - 2 Approx. 80°C (176°F) 0.310k to 0.326 kΩ

      If the result is not as specified, replace the sensor.

      NOTE: When checking the sensor in water, keep the terminals dry. After the check, wipe the sensor dry.
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