see manifold absolute pressure sensor mass airflow sensor MP
Refers to a manifold absolute pressure sensor, a variable resistor used to monitor the difference in pressure between the intake manifold at outside atmosphere. This information is used by the engine computer to monitor engine load (vacuum drops when the
Manifold Absolute Pressure sensor. Measure the absolute pressure in the intake manifold (related to the engine vacuum), to determine the load on the engine and the consequent fueling requirements.
Many fuel-injected engines use a manifold absolute pressure (MAP) sensor to measure vacuum in the engine's induction system. The device measures the engine vacuum and sends that data to the vehicle's on-board computer where it is used to calculate how much fuel is needed to maintain the desired air/fuel ratio.
Manifold Absolute Pressure. Used by some aftermarket engine management systems instead of an AFM.
The examples and descriptions in this article apply strictly to four-stroke cycle gasoline engines. Other engine types such as diesel, or two-stroke cycle can differ in the exact implementation, but the general theme still applies.