DTC P0101: Volume Airflow Circuit Range/Performance Problem: Description

While the engine is running, the Volume Airflow (VAF) sensor outputs a pulse signal which corresponds to the volume of air flow. The ECM or PCM checks whether the frequency of this signal output by the VAF sensor while the engine is running is at or above the set value. When the throttle position sensor output voltage is low, the ECM or PCM causes the power transistor to be ON to send an airflow sensor reset signal to the VAF sensor. In response to the reset signal, the VAF sensor resets the filter circuit and improves the ability of the airflow sensor to measure the amount of air in a small air intake region.