Toyota Tundra Service Manual: Inspection

Toyota Tundra Service Manual / Vehicle Interior / Air Conditioning / Room Temperature Sensor(for Automatic Air Conditioning System) / Inspection

INSPECTION

PROCEDURE

1. INSPECT COOLER (ROOM TEMPERATURE SENSOR) THERMISTOR

(a) 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

NOTICE:

  • Touching the sensor even slightly may change the resistance value. Hold the connector of the sensor.
  • When measuring the resistance, the sensor temperature must be the same as the ambient temperature.

HINT:

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

Text in Illustration

*a

Component without harness connected

(Cooler (Room Temperature Sensor) Thermistor)

*b

Resistance (kΩ)

*c

Temperature

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

    Installation

    See More:

    Toyota Tundra Service Manual > Air Conditioning System(for Automatic Air Conditioning System): Compressor Lock Sensor Circuit (B1422/22)
    DESCRIPTION The ECM sends an engine speed signal to the air conditioning amplifier via the CAN communication system. The air conditioning amplifier reads the difference between compressor speed and engine speed. When the difference becomes too large, the air conditioning amplifier determines that th ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2025 Copyright www.ttundra.com
    0.0339