What does car MAP mean?

[Bryce]

Car MAP refers to the Manifold Absolute Pressure sensor. It connects to the intake manifold via a vacuum tube and senses the vacuum changes inside the intake manifold as the engine operates under different speeds and loads. The sensor then converts the internal resistance changes into voltage signals, which are used by the ECU to adjust fuel injection quantity and ignition timing. There are various types of intake pressure sensors, including piezoresistive and capacitive types. Due to advantages such as fast response time and high detection accuracy, piezoresistive MAP sensors are widely used in D-type fuel injection systems. The MAP sensor detects the absolute pressure in the intake manifold behind the throttle valve. It monitors changes in absolute pressure within the manifold based on engine speed and load, then converts this into a signal voltage sent to the engine control unit (ECU). The ECU uses this signal voltage to determine the basic fuel injection quantity.