Mass Air Flow (MAF) Sensor
WARNING: This page is about a different car, the 2002 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.
The mass air flow (MAF) sensor measures the mass of air flowing into the engine. The MAF sensor output signal is used by the powertrain control module to calculate injector pulse width. For transmission strategies, the mass air flow sensor is used to regulate EPC, shift and torque converter clutch scheduling.