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. The mass air flow 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). 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.

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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