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Engine Coolant Temperature Sensor: Inspection

  1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    1. Partially insert the sensor into the water and warm up the water.
    2. Measure the resistance between the terminals.

      Standard resistance 

      ENGINE COOLANT TEMPERATURE SENSOR

      Condition Specified Condition
      Approx. 20°C (68°F) 2.32 to 2.59 kΩ
      Approx. 80°C (176°F) 0.310 to 0.326 kΩ
      Fig 1: Inspecting Engine Coolant Temperature Sensor
      G04435533Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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