Circuit Operation
- The volume air flow sensor power is supplied from the MFI relay (terminal 4), and the ground is provided on the ECM (terminal 40 - M/T) or PCM (terminal 16 - A/T).
- 5 volts power is applied to the volume air flow sensor output terminal (terminal 3) from the ECM (terminal 90) (M/T) or PCM (terminal 65 - A/T). The volume air flow sensor generates a pulse signal when the output terminal and ground are opened/closed (opened/short).