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How does the intake manifold pressure sensor (or MAP sensor) work?

Model: (Various brands) Various
Part: Checks and maintenance

Video tutorial

The intake manifold pressure sensor is also known as the MAP sensor (Manifold Absolute Pressure), which is responsible for measuring the air inside the engine's intake manifold. This measurement is crucial for the engine's electronic control unit (ECU) to determine the amount of air entering the engine.

In fact, based on this information, the ECU regulates fuel injection to ensure the best air/fuel ratio for efficient combustion. When the engine is idling or at low speeds, the pressure in the manifold is low (high vacuum); when the engine accelerates, the throttle valve opens and the pressure in the manifold increases.

The MAP sensor converts these pressure variations into an electrical signal that is sent to the ECU, which uses it to calculate the amount of fuel needed for combustion.


Posted on 30 March 2025 by ScegliAuto


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