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Engine Coolant Temperature Sensor: Inspection

  1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    1. Measure the resistance between the terminals.

      Standard Resistance 

      TERMINALS RESISTANCE CHART

      Condition Specified Condition
      Approx. 20°C (68°F) 2.32 to 2.59 kΩ
      Approx. 80°C (176°F) 0.31 to 0.326 kΩ
      Fig 1: Measuring Resistance Between Engine Coolant Temperature Sensor Terminals
      G04973882Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

      NOTE: If checking the ECT sensor in the water, keep the terminals dry. After checking, dry the sensor.
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