Intake Manifold Pressure Sensor
WARNING: This page is about a different car, the 1996 Mercedes-Benz SL320. However, it is still accessible from the selected car via links, so may be relevant.
Intake manifold pressure sensor information is used by the Engine Control Module (ECM) for camshaft adjustment. Pressure in intake manifold reacts on a diaphragm which changes the resistance of peizo resistors. This change influences output voltage.