Mass Air Flow Sensors (MAF) - Getting The Correct Amount Of Air
Mass Air Flow Sensors (MAF) – Getting The Correct Amount Of Air

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Mass Air Flow Sensor (MAF) – Measuring Volume, Density, Temperature


So, A mass air flow (MAF) sensor; is one of the key components; of an electronic fuel injection system. It is located between the air filter; and the intake manifold of the engine. Also, The (MAF) sensor measures; the amount of air entering the engine or the air flow.

In most modern cars; they will also have a intake air temperature (IAT) sensor; built into the (MAF). Consequently; There are a few types of air flow sensors; however, modern cars use a hot-wire type.

A hot-wire mass air flow (MAF) sensor; has a small electrically heated wire (hot wire). A temperature sensor installed close to the hot wire; measures the temperature of the air near the 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 you press the gas; the throttle opens; allowing more air to flow over the hot wire. The passing air cools the wire down.

Rough engine idle can also be a problem.

So, The more air that flows over the wire; the higher the electrical current must be. The electric current is proportional to the amount of air flow. A small electronic chip installed inside the air flow sensor; translates the electric current into a digital signal. And, Then sends it to the engine computer (PCM). The (PCM) uses the air flow signal; to calculate how much fuel to inject. Finally, The goal is to keep the air fuel ratio at the optimal level.

In addition, The (PCM) uses the air flow readings; to determine the shift points of the automatic transmission. So, If the air flow sensor doesn’t work properly; the automatic transmission might shift differently as well.

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