Air Injection Flow Sensor: Description and Operation

The Mass Air Flow Sensor(MAF) is mounted on the air pump bracket. There is a filter assembly mounted to the MAF.

Airflow is measured by the MAF sensor. A voltage will be produced via the MAF sensor when air is passed through. Changes in air flow and air density cause the temperature of the ceramic element to fluctuate. The ceramic element changes resistance respectively to changes in temperature. This voltage correlates to airflow. The change in resistance varies the signal voltage output to the PCM.