R 350 (251.156) V6-3.5L (272.967) (2008)
Function
Any vibrations which occur are converted with the aid of the piezoceramic into electrical signals.
Piezo-electric effect: If a mechanical force acts on a crystal, electrical voltages are produced.
The noise signal is modulated to a DC voltage from 0.13 to 4.7 V for transmission to the ME control unit.
Knock sensor signals may also indicate engine damage, e.g. increased engine noise resulting from a widened piston groove.