Circuit Description

The MAF sensor measures the amount of air which passes through the sensor in a given amount of time. The engine control module (ECM) uses this information to determine the operating requirements of the engine in order to control the fuel delivery. The ECM calculates the engine 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 ECM from the MAF sensor also increases. When the airflow decreases, the current sensed by the ECM also decreases. The ECM compares the actual MAF sensor voltage signal to the predicted MAF value. This comparison will determine if the signal is stuck, or is too low or too high for a given operating condition. If the ECM detects that the actual MAF sensor voltage signal is not within a predetermined range of the calculated MAF value, DTC P0101 sets.