AMBIENT TEMPERATURE SENSOR INSPECTION

PROCEDURE


  1. INSPECT THERMISTOR ASSEMBLY


    1. Check the resistance.


      1. A001Y2OC20
        *a

        Component without harness connected

        (Thermistor Assembly)
        *b Sensing Portion
        *c Resistance (kΩ)
        *d Temperature (°C (°F))
        *e Allowable Range

        Measure the resistance according to the value(s) in the table below.

        Standard resistance
        Tester Connection Condition Specified Condition
        1 - 2 10°C (50°F) 3.00 to 3.73 kΩ
        15°C (59°F) 2.45 to 2.88 kΩ
        20°C (68°F) 1.95 to 2.30 kΩ
        25°C (77°F) 1.60 to 1.80 kΩ
        30°C (86°F) 1.28 to 1.47 kΩ
        35°C (95°F) 1.00 to 1.22 kΩ
        40°C (104°F) 0.80 to 1.00 kΩ
        45°C (113°F) 0.65 to 0.85 kΩ
        50°C (122°F) 0.50 to 0.70 kΩ
        55°C (131°F) 0.44 to 0.60 kΩ
        60°C (140°F) 0.36 to 0.50 kΩ

        Note


        • Hold the sensor only by its connector. Touching the sensing portion may change the resistance value.

        • When measuring, the sensor temperature must be the same as the ambient temperature.

        • Use a thermometer to detect the ambient temperature of the installation area around the thermistor assembly.

        Tech Tips

        As the temperature increases, the resistance decreases (see the graph).

        If the specified condition is not met, replace the thermistor assembly.