DTC P0127: IAT Sensor: Description

The intake air temperature sensor is built-into the mass air flow sensor (1). 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 rise in temperature.

Fig 1: Identifying Mass Air Flow Sensor

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

VOLTAGE AND RESISTANCE REFERENCE CHART

Intake air temperature [°C (°F)]

Voltage⁽¹⁾ (V)

Resistance (kΩ)

25 (77)

3.3

1.800 - 2.200

80 (176)

1.2

0.283 - 0.359

⁽¹⁾	This data is reference value and is measured between ECM terminal 50 (Intake air temperature sensor) and 58 (Sensor ground).

Fig 2: Temperature Vs Resistance Graph

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