Circuit Description

The DTC P0101 Mass Air Flow (MAF) Sensor Performance diagnostic monitors the accuracy of the MAF sensor signal. The MAF sensor measures the amount of air which passes through the sensor in a given amount of time. The Powertrain Control Module (PCM) uses this information to determine the operating requirements of the engine in order to control the fuel delivery. The PCM calculates the engine's fuel requirements by monitoring the current flow on the signal wire from the MAF sensor. When the volume of air entering the MAF sensor increases, the current flow sensed by the PCM from the MAF sensor also increases. When the air flow decreases, the current sensed by the PCM also decreases. The MAF sensor is located between the air intake tube and the air cleaner in the right front area of the engine compartment.