Air Temperature Sensor ( Ambient / Intake ): Description and Operation

INTAKE AIR TEMPERATURE SENSOR (IAT Sensor)
The intake air temperature sensor (IAT Sensor), located on the intake manifold, is a resistor-based sensor for detecting the intake air temperature.

According to the intake air temperature information from the sensor, the ECM provides necessary fuel injection amount control.

MASS AIR FLOW (MAF) SENSOR & INTAKE AIR TEMPERATURE (IAT) SENSOR
This hot film type air flow sensor is composed of a hot film sensor, housing, metering duct (hybrid, sensor element).

Mass air flow rate is measured by detection of heat transfer from a hot film probe because the change of the mass air flow rate causes change in the amount of heat being transferred from the hot film probe surface to the air flow. The air flow sensor generates a pulse so it repeatedly opens and closes between the 5 V voltage supplied from the engine control module. This results in the change of the temperature of the hat film probe and in the change of resistance.