Airflow Meter

Airflow meter measures intake airflow volume. On Previa Supercharged, airflow meter converts intake air readings into a voltage signal by means of the air swirl frequency.

Input signal is sent to Engine Control Module (ECM) for controlling fuel injection system operation and ignition timing (spark advance). On Previa Non-Supercharged, airflow meter also contains a switch which is used for controlling fuel pump operation.