HUMIDITY SENSOR INSPECTION


  1. INSPECT AIR CONDITIONING THERMISTOR ASSEMBLY


    1. A01FGR2E01
      Text in Illustration
      *a

      Component without harness connected

      (Air Conditioning Thermistor Assembly (Glass Temperature Sensor))
      *b Heat Conduction Sheet
      *c Resistance (kΩ)
      *d Temperature (°C (°F))

      For glass temperature sensor:


      1. Remove the air conditioning thermistor assembly (glass temperature sensor).

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        1 (SEG3) - 4 ( TFG) 10°C (50°F) 5.92 to 6.09 kΩ
        1 (SEG3) - 4 (TFG) 15°C (59°F) 4.94 to 5.07 kΩ
        1 (SEG3) - 4 (TFG) 20°C (68°F) 4.20 to 4.29 kΩ
        1 (SEG3) - 4 (TFG) 25°C (77°F) 3.64 to 3.70 kΩ
        1 (SEG3) - 4 (TFG) 30°C (86°F) 3.19 to 3.26 kΩ
        1 (SEG3) - 4 (TFG) 35°C (95°F) 2.85 to 2.91 kΩ
        1 (SEG3) - 4 (TFG) 40°C (104°F) 2.58 to 2.64 kΩ
        1 (SEG3) - 4 (TFG) 45°C (113°F) 2.37 to 2.43 kΩ
        1 (SEG3) - 4 (TFG) 50°C (122°F) 2.21 to 2.26 kΩ
        1 (SEG3) - 4 (TFG) 55°C (131°F) 2.07 to 2.12 kΩ
        1 (SEG3) - 4 (TFG) 50°C (140°F) 1.97 to 2.01 kΩ

        Note


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

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

        Tech Tips

        As the temperature increases, the resistance decreases (refer to the graph).

        If the result is not as specified, replace the air conditioning thermistor assembly (glass temperature sensor).

    2. A01FGR2E03
      Text in Illustration
      *a

      Component without harness connected

      (Air Conditioning Thermistor Assembly (Glass Surroundings Temperature Sensor))
      *b Heat Conduction Sheet
      *c Resistance (kΩ)
      *d Temperature (°C (°F))

      For glass surroundings temperature sensor:


      1. Remove the air conditioning thermistor assembly (glass surroundings temperature sensor).

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        1 (SEG3) - 2 (TNG) 10°C (50°F) 5.92 to 6.09 kΩ
        1 (SEG3) - 2 (TNG) 15°C (59°F) 4.94 to 5.07 kΩ
        1 (SEG3) - 2 (TNG) 20°C (68°F) 4.20 to 4.29 kΩ
        1 (SEG3) - 2 (TNG) 25°C (77°F) 3.64 to 3.70 kΩ
        1 (SEG3) - 2 (TNG) 30°C (86°F) 3.19 to 3.26 kΩ
        1 (SEG3) - 2 (TNG) 35°C (95°F) 2.85 to 2.91 kΩ
        1 (SEG3) - 2 (TNG) 40°C (104°F) 2.58 to 2.64 kΩ
        1 (SEG3) - 2 (TNG) 45°C (113°F) 2.37 to 2.43 kΩ
        1 (SEG3) - 2 (TNG) 50°C (122°F) 2.21 to 2.26 kΩ
        1 (SEG3) - 2 (TNG) 55°C (131°F) 2.07 to 2.12 kΩ
        1 (SEG3) - 2 (TNG) 60°C (140°F) 1.97 to 2.01 kΩ

        Note


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

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

        Tech Tips

        As the temperature increases, the resistance decreases (refer to the graph).

        If the result is not as specified, replace the air conditioning thermistor assembly (glass surroundings temperature sensor).

    3. A01FFIYE01
      Text in Illustration
      *a

      Component without harness connected

      (Air Conditioning Thermistor Assembly (Humidity Sensor))
      *b Heat Conduction Sheet
      *c Voltage (V)
      *d Relative Humidity (%)

      For humidity sensor:


      1. Remove the air conditioning thermistor assembly (humidity sensor) with the connector still connected.

      2. Turn the engine switch on (IG).

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        1 (SEG3) - 3 (RH) Humidity is 5 to 15% 1.01 V
        1 (SEG3) - 3 (RH) Humidity is 15 to 25% 1.37 V
        1 (SEG3) - 3 (RH) Humidity is 25 to 35% 1.73 V
        1 (SEG3) - 3 (RH) Humidity is 35 to 45% 2.09 V
        1 (SEG3) - 3 (RH) Humidity is 45 to 55% 2.45 V
        1 (SEG3) - 3 (RH) Humidity is 55 to 65% 2.81 V
        1 (SEG3) - 3 (RH) Humidity is 65 to 75% 3.17 V
        1 (SEG3) - 3 (RH) Humidity is 75 to 85% 3.53 V
        1 (SEG3) - 3 (RH) Humidity is 85 to 95% 3.89 V

        Note


        • Do not touch the sensor as body heat will affect the inspection results. When performing the inspection, hold the sensor by its connector.

        • Allow the sensor to acclimate to the ambient temperature and humidity before performing the inspection.

        • The specified voltages in the table above are based on inspections performed when the ambient temperature is 25°C (77°F).

        Tech Tips

        As the humidity increases, the voltage increases (refer to the graph).

        If the result is not as specified, replace the air conditioning thermistor assembly (humidity sensor).