Circuit Description

The Mass Air Flow (MAF) sensor measures the amount of air which passes through it into the engine during a given time. The PCM uses the mass air flow information to monitor engine operating conditions for fuel delivery calculations. A large quantity of air entering the engine indicates an acceleration or high load situation, while a small quantity of air indicates deceleration or idle. The MAF sensor produces a frequency signal which can be monitored using a Tech 2. The frequency will vary within a range of around 4 to 7 g/s at idle to around 25 to 40 g/s at maximum engine load. DTC P0101 will be set if the signal front he MAF sensor does not match a predicted value based on throttle position and engine RPM. For a wiring diagram of the MAF sensor, see WIRING DIAGRAMS .