Bro simple sa scene hai these engines are mpfi. Multi port fuel injection.
Iski fuel. Management is based on
Water temp sensor reading ;ie how hot is the engine Temperature, then oxygen sensor tells ecu how lean or Rich is the fuel mixture, then tp sensor how wide the throttle is open, cam is use for spark timing. And crank bhi ignition timing.
So is case mein
Jo genuine jismein QG15de ata haina usmein ecu mein hi vss ki wire hoti hai but it's like input output ka kaam karhi hoti hai.
Apkay case mein vss role play karha hota hai.
Vss speed btata hai kay kispe hai gari, uskay accordingly throttle kholta hai so uskay computer kay circuit kay case mein vss is a gateway but in wiredriven its kinda or gate matlab it doesn't effects fuel management at all.