A MAP sensor (MAP = manifold absolute pressure ) is a pressure sensor for detecting the intake manifold - absolute pressure in gasoline and turbo diesel engines . In the gasoline engine, the measured variable is used to control the electronic intake manifold injection ; in the turbodiesel, a signal is obtained from this in order to control the position of the turbine guide vanes on VTG loaders , among other things .
LPG systems that inject in the gas phase also require a MAP sensor, depending on the type, to assess the gas pressure in relation to the pressure in the intake pipe.
As a rule, the MAP sensor is attached directly to the intake manifold. The intake manifold pressure usually acts on a piezo element , which then generates a corresponding output signal via an electronic circuit. This can be a PWM signal or an electrical voltage .
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