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Engine Coolant Temperature Sensor: Inspection

  1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.
        Fig 1: Engine Coolant Temperature Sensor Resistance Chart
        G04968220Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

        Resistance 

        TESTER CONNECTION SPECIFIED CONDITION

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

        If the result is not as specified, replace the engine coolant temperature sensor.

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