Toyota Prius 2010 Repair Manual page 81

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.
HINT:
As the temperature increases, the resistance decreases (see the graph).
Text in Illustration
Component without harness connected
*1
(Ambient Temperature Sensor)
*2 Sensing Portion
NG
REPLACE AMBIENT TEMPERATURE SENSOR
OK
CHECK HARNESS AND CONNECTOR (AMBIENT TEMPERATURE SENSOR - A/C
3.
AMPLIFIER)
2010 Toyota Prius
(a) Disconnect the A/C amplifier connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
L17-5 (TAM) - A4-1
L17-13 (SG-2) - A4-2
L17-5 (TAM) - Body ground
L17-13 (SG-2) - Body ground
Text in Illustration
Condition Specified Condition
Always Below 1 Ω
Always Below 1 Ω
Always 10 kΩ or higher
Always 10 kΩ or higher
Repair Manual