Component Description

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 IAT Sensor

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

Reference data

IAT SENSOR - INTAKE AIR TEMPERATURE, VOLTAGE AND RESISTANCE SPECIFICATIONS (DTC P0127)

Intake air temperature °C (°F)

Voltage⁽¹⁾ V

Resistance kΩ

25 (77)

3.32

1.94 - 2.06

80 (176)

1.23

0.295 - 0.349

⁽¹⁾	This data is reference value and is measured between ECM terminal 34 (intake air temperature sensor) and ground.

Fig 2: IAT Sensor Temperature/Resistance Graph (DTC P0127)

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.