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Engine Coolant Temperature Sensor: Inspection

  1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    1. Measure the resistance of the sensor.
      Fig 1: Locating Sensor Connector
      G04973365Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Resistance And Temperature Graph
      G06276536Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      1 (E2) - 2 (THW) 2.32 to 2.59 kΩ at 20°C (68°F)
      1 (E2) - 2 (THW) 0.310 to 0.326 kΩ. at 80°C (176°F)
      NOTE: If checking the sensor in water, be careful not to allow water to contact the terminals. After checking, wipe the water off the sensor.

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