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Engine Coolant Temperature Sensor: Inspection

  1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    1. Measure the resistance of the sensor.
    Fig 1: Resistance And Temperature Graph
    G04221344Courtesy 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.