Air Flow Sensor (AFS): Mass Air Flow (MAF) Sensor & Intake Air Temperature Sensor (ATS): Notes

This hot film type Air Flow Sensor (AFS) is composed of a hot film sensor, housing and metering duct (hybrid sensor element). Mass air flow 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 5V voltage supplied from the ECU.

The intake air temperature sensor (ATS), 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.