AMBIENT TEMPERATURE SENSOR (For Automatic Air Conditioning System): Inspection

WARNING: This page is about a different car, the 2007 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT AMBIENT TEMPERATURE SENSOR

Measure the resistance of the sensor.

Fig 1: Identifying Ambient Temperature Sensor Connector & Resistance Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

TERMINALS RESISTANCE SPECIFICATION

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

NOTE:

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 Fig 1).

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