Air Flow Meter/Sensor: Description and Operation

Mass Air Flow Sensor (MAF) & Intake Air Temp. Sensor (ATS)
This hot film type air flow sensor is composed of a hot film sensor, housing and metering duct (hybrid sensor element). Mass airflow rate is measured because the change of the mass air flow rate causes a 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 powertrain control module.

The intake air temperature sensor (ATS Sensor), located in the intake air hose, is a resistor-based sensor for detecting the intake air temperature. The intake air temperature information from the sensor helps the ECU provide the necessary fuel injection.