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Ambient Temperature Sensor: Inspection

  1. INSPECT AMBIENT TEMPERATURE SENSOR 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      1-2 10°C (50°F) 3.00 to 3.73 kΩ
      1-2 15°C(59°F) 2.45 to 2.88 kΩ
      1-2 20°C (68°F) 1.95 to 2.30 kΩ
      1-2 25°C (77°F) 1.60 to 1.80 kΩ
      1-2 30°C (86°F) 1.28 to 1.47 kΩ
      1-2 35°C (95°F) 1.00 to 1.22 kΩ
      1-2 40°C(104°F) 0.80 to 1.00 kΩ
      1-2 45°C(113°F) 0.65 to 0.85 kΩ
      1-2 50°C (122°F) 0.50 to 0.70 kΩ
      1-2 55°C(131°F) 0.44 to 0.60 kΩ
      1-2 60°C (140°F) 0.36 to 0.50 kΩ
      NOTE:
      • Even slightly touching the sensor may change the resistance value. Be sure to hold the sensor connector.
      • When measuring, the sensor temperature must be the same as the ambient temperature.
        Fig 1: Identifying Ambient Temperature Sensor Connector Terminals
        G05390122Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      As the temperature increases, the resistance decreases (see Fig 1 ).

      If the resistance is not as specified, replace the ambient temperature sensor.

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