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Engine Coolant Temperature Sensor: Inspection

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  1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    Fig 1: Identifying Engine Coolant Temperature Sensor
    G04973365Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance of the sensor.
      Fig 2: Identifying Resistance Of Engine Coolant Temperature Sensor
      G05183820Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      RESISTANCE SPECIFICATION

      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.