What is MAP Sensor?

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MAP Sensor:

The manifold absolute pressure sensor (MAP sensor) is one of the sensors employed in an enclosed combustion engine’s electronic system.

Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine’s electronic control unit (ECU). The info is employed to calculate air density and determine the engine’s atmospheric state rate of flow, which successively determines the specified fuel metering for optimum combustion (see stoichiometry) and influence the advance or retard of ignition timing. A fuel-injected engine may alternatively use a mass airflow sensor (MAF sensor) to detect the intake airflow. A typical naturally aspirated engine configuration employs one or the opposite, whereas forced induction engines typically use both; a MAF sensor on the charge pipe resulting in the throttle body and a MAP sensor on the intake tract pre-turbo.

MAP sensor data is converted to atmosphere data by employing a second variable coming from an IAT Sensor (intake air temperature sensor). This is often called the speed-density method. Engine speed (RPM) is additionally wont to determine where on a lookup table to work out to fuel, hence speed-density (engine speed/air density). The MAP sensor can even be utilized in OBD II (on-board diagnostics) applications to check the EGR (exhaust gas recirculation) valve for functionality, an application typical in OBD II equipped General Motors engines.

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