P0127 IAT Sensor: Description

The intake air temperature sensor is built-into 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 temperature rise.

Fig 1: Identifying Mass Air Flow Sensor

< Reference data >

REFERENCE DATA

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⁾	These data are reference values and are measured between ECM terminals 50 (Intake air temperature sensor) and 58 (Sensor ground).

Fig 2: Resistance And Temperature Graph