ROOM TEMPERATURE SENSOR INSPECTION

  1. INSPECT ROOM TEMPERATURE SENSOR (COOLER THERMISTOR)

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

      A011VUCE54
      Standard Resistance
      Tester Connection Condition Specified Condition
      I57-1 (+) - I57-2 (-) 10°C (50°F) 3.00 to 3.73 kΩ
      I57-1 (+) - I57-2 (-) 15°C (59°F) 2.45 to 2.88 kΩ
      I57-1 (+) - I57-2 (-) 20°C (68°F) 1.95 to 2.30 kΩ
      I57-1 (+) - I57-2 (-) 25°C (77°F) 1.60 to 1.80 kΩ
      I57-1 (+) - I57-2 (-) 30°C (86°F) 1.28 to 1.47 kΩ
      I57-1 (+) - I57-2 (-) 35°C (95°F) 1.00 to 1.22 kΩ
      I57-1 (+) - I57-2 (-) 40°C (104°F) 0.80 to 1.00 kΩ
      I57-1 (+) - I57-2 (-) 45°C (113°F) 0.65 to 0.85 kΩ
      I57-1 (+) - I57-2 (-) 50°C (122°F) 0.50 to 0.70 kΩ
      I57-1 (+) - I57-2 (-) 55°C (131°F) 0.44 to 0.60 kΩ
      I57-1 (+) - I57-2 (-) 60°C (140°F) 0.36 to 0.50 kΩ

      If the resistance is not as specified, replace the room temperature sensor (cooler thermistor).

      Text in Illustration
      *a

      Component without harness connected

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

      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 (see the graph).