What does MAP mean in cars?

[NoahFitz]

In automobiles, MAP stands for Manifold Absolute Pressure sensor. The MAP is used to measure changes in absolute pressure (vacuum) within the intake manifold and converts this into a voltage signal, which is then transmitted to the Engine Control Unit (ECU). Based on this data combined with engine speed signals, the ECU determines the appropriate fuel injection quantity. Here's more about the MAP: 1. The manifold absolute pressure sensing element consists of a silicon chip with an etched pressure diaphragm, which contains a piezoresistive strain gauge forming a Wheatstone bridge. 2. The silicon chip is micron-level thin, so changes in intake manifold pressure cause deformation of the silicon chip, altering the piezoresistor's resistance. After processing by the silicon chip's signal conditioning circuit, a voltage signal linearly proportional to the pressure is generated.