A manifold absolute pressure sensor, or MAP sensor for short, is used in fuel injected vehicles to measure the air pressure inside the intake manifold of the engine. The MAP sensor sends this information to the electronic control unit, or ECU, which uses this information to adjust the amount of fuel being added at any point to achieve the most.. The manifold absolute pressure (MAP) sensor measures the air pressure in the intake manifold for the computer to adjust the air/fuel ratio. When a MAP sensor fails, it can affect engine performance or turn on the check engine light for code P0107B.
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Under normal conditions, actual atmospheric pressure or air pressure is usually around 14.7 PSI (29.9 inHg) at sea level. And when the engine is running, the plunging piston motion creates a vacuum. The intake manifold vacuum reduces the original barometric pressure by around 9.7 PSI (20 inHg), so the MAP sensor reading drops to about 5 PSI (10.. The MAP sensor measures the absolute pressure inside the intake manifold of the engine. At sea level, atmospheric pressure is about 14.7 psi (pounds per square inch). When the engine is off, the absolute pressure inside the intake equals atmospheric pressure, so the MAP will indicate about 14.7 psi. At a perfect vacuum, the MAP sensor will read.
