ANSWERS: 1
  • The manifold absolute pressure, or MAP, sensor in a car engine helps the engine computer determine the proper mix of air and fuel for proper performance.

    Function

    According to AA1Cars.com, a MAP sensor detects the difference between atmospheric pressure and intake vacuum pressure, sending this information to the engine computer.

    Intake Vacuum Pressure

    The vacuum pressure inside the car's intake manifold varies with the throttle position. When the throttle opens during acceleration, for instance, the engine takes in air and the internal vacuum drops.

    Atmospheric Pressure

    The MAP sensor compares the vacuum pressure to external atmospheric pressure because climate, altitude and weather changes can affect the differential between these two variables.

    Components

    A MAP sensor consists of a pressure-sensitive circuit connected to a diaphragm separating two chambers. One chamber contains air at atmospheric pressure, while the other duplicates the vacuum pressure of the intake manifold.

    Possible Issues

    A MAP sensor may malfunction due to a failure of its own components or connected engine parts, causing fuel mix problems that lead to rough engine performance.

    Source:

    AA1Cars.com: Manifold Absolute Pressure MAP Sensors

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