The intake air temperature sensor is a negative temperature coefficient thermistor,Intake air temperature sensor is also a two-wire sensor,Installed in the intake pipe or air flow meter.

Intake Air Temperature Sensor, IATS installed in the intake line,Its function is to detect the intake air temperature,And converts the temperature signal into an electrical signal to the ECU.The intake air temperature signal is a correction signal for various control functions.If the intake air temperature sensor signal is interrupted,It will lead to hot start difficult, exhaust emissions increased.
 
It is well known that the air weight is related to the intake air temperature and atmospheric (intake) pressure.When the air inlet temperature is low, the air density is high,The weight of the same volume of gas increases;Conversely, when the intake air temperature increases,The weight of the same volume of gas will be reduced.Employing manifold pressure type, flap type, eddy current type Kalman,In the fuel injection system of the core type air flow sensor,Since the air flow rate measured by the air flow sensor is the volume flow rate,So need to be equipped with intake air temperature sensor and atmospheric pressure sensor.

ECU according to the engine intake air temperature and pressure signal correction fuel injection,So that the engine automatically adapt to the external ambient temperature (cold, high temperature) and pressure (plateau, plain) changes.When the intake air temperature is low (high air density)Thermistor resistance is large,The sensor input ECU signal voltage is high,ECU control injector to increase fuel injection;On the other hand, when the intake air temperature is high (air density is low)Thermistor resistance is small,Sensor input ECU signal voltage is low,The ECU will control the injector to reduce fuel injection.