Special Functions – MAF scaling
What is MAF – Mass Air Flow sensor?
Mass Air Flow sensor – MAF sensor, is used to determine the mass air flow entering a fuel injected engine.
It is installed between the air filter and the intake manifold of the engine. In modern vehicles an intake air temperature (IAT) sensor is built in the mass air flow sensor.
There are few tpye of MAF, modern vehicles use a hot wire type. It has a small electrically heated wire, hot wire. When the engine is idling, a small amount of air flows around the hot wire, so it takes a very low electric current to keep the wire hot. When press the gas the throttle opens allowing more air to flow over the hot wire.
This air cools the wire down. The more air flows over the wire, the more current is needed to keep it hot. A chip installed inside the MAF translates the electric current into a digital signal and sends it to the ECU (engine control unit). The objective is to keep the AFR at the optimal level.
We are able to put inside the bin definition file (xdf) all parameters need to manage and change the mass air flow sensor.
Where can I find this special function?
If the vehicle and engine control unit are supported with this function, you will find the MAF scaling mark in column “special functions”.
Click here below and look for your vehicle: