Component Description

WARNING: This page is about a different car, the 2005 Infiniti FX45. However, it is still accessible from the selected car via links, so may be relevant.

The intake air temperature sensor is built into mass air flow sensor. The sensor detects intake air temperature and transmits a signal to the ECM.

The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise.

Fig 1: Identifying Components IAT Sensor

Courtesy of NISSAN MOTOR CO., U.S.A.

< Reference data>

TEMPERATURE REFERENCE

Intake air temperature °C (°F)

Voltage⁽¹⁾ V

Resistance kohm

25 (77)

3.32

1.94-2.06

80 (176)

1.23

0.295 - 0.349

⁽¹⁾	These data are reference values and are measured between ECM terminal 34 (Intake air temperature sensor) and ground.

Fig 2: Resistance And Temperature Graph

Courtesy of NISSAN MOTOR CO., U.S.A.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.