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Engine Coolant Temperature Sensor: Inspection

  1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    1. Partially soak the sensor in water and warm up the water.
      Fig 1: Locating Sensor Connector
      G05285367Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Measuring Resistance Between Engine Coolant Temperature Sensor Terminals
      G05803590Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the terminals.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

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

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

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