Manifold Absolute Pressure Switch

As you may know the intake manifold is responsible for distributing the air and fuel mixture from the internal combustion chamber into each cylinder.

Manifold absolute pressure switch.

The pcm uses this input as well as others to calculate the correct amount of fuel to inject into the cylinders. The manifold absolute pressure map sensor is used by the powertrain control module pcm for engine load input. A vehicle s manifold pressure sensor or manifold absolute pressure sensor map is part of an engine s electronic control system. In this video we cover the imap manifold absolute pressure.

How it works is 5 volts dc is supplied to the sensor from the pcm powertrain control module. Change this sensor out. The map sensor responds to changes in the intake manifold pressure vacuum and provides a reading of engine load. The map sensor measures the absolute pressure inside the intake manifold of the engine.

The map sensor also known as the manifold absolute pressure sensor is a necessary component of your vehicle s fuel injection system. A failing map sensor can cause engine hesitation rough idle or black smoke from the tail pipe. Your manifold absolute pressure or map sensor measures the pressure in the intake manifold for the engine control unit to adjust fuel flow and engine timing. It s usually found in vehicles that use fuel injection.

Bwd map sensors convert engine vacuum manifold pressure to an electrical signal for fuel delivery and timing control. If the map were to go bad you will likely know it. This constant adjustment helps to keep your engine running smoothly.