Technical Description

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