General Description

The Mass Air Flow (MAF) sensor measures the amount of air which passes through the throttle body. The PCM uses this information to determine the operating condition of the engine and to control fuel delivery. A large quantity of air indicates acceleration or a high engine load, while a small quantity indicates deceleration or an idle.

The scan tool displays the MAF value in grams per second (gm/s). For a fully warmed up engine at idle, the MAF should be between 4 gm/s and 7 gm/s. The values should change rather quickly on acceleration, but remain fairly stable at any given RPM. A MAF sensor malfunction or a MAF signal circuit problem should set a DTC P0101, DTC P0102, or DTC P0103.