Airflow Meter

Mounted in the air induction system near the air cleaner, the airflow meter measures intake air volume.

On all models except Supra Turbo, a Bosch vane airflow meter converts intake air readings into a voltage signal by means of a variable resistor (potentiometer). When intake air volume is low, the voltage is high; when the air volume is high, the voltage signal is close to zero.

On Supra Turbo, a Karman-Vortex airflow meter is used to measure intake airflow and turbo boost pressure. Corolla (4A-FE) and Tercel do not use an airflow meter.