Marquis L4-140 2.3L VIN A 1-bbl (1986)
Knock Sensor: Description and Operation
The Knock Sensor, is a piezoelectric accelerometer with the sensor designed to resonate at approximately the same frequency as the engine knock
frequency. The sensor uses the resonant frequency to mechanically amplify the vibrations. This method allows relatively large signals to be achieved
without electrical amplification and with small package size.
The sensor has a thin circular piezoelectric ceramic disk which is bonded to a metal diaphragm. Electrical connections are made through a two pin
integral connector.
