Intake Air Temperature
The Intake Air Temperature (IAT) sensor is built into the Mass Air Flow (MAF) sensor or in some vehicles mounted to the air filter duct housing. The sensor detects intake air temperature and transmits a signal to the Engine Control Module (ECM).
The temperature sensing unit uses a thermistor that is sensitive to the change in temperature. The electrical resistance of the thermistor decreases in response to the temperature rise.
The Intake Air Temperature signal is used as an input for various systems in the vehicle.