900 S Convertible L4-2290cc 2.3L DOHC (1996)
Knock Sensor: Description and Operation
The engine has a knock sensor. On the basis of information supplied by the camshaft position sensor, the control module knows which cylinder is under
compression when ignition occurs.
If knocking is detected, the ignition will be retarded for the relevant cylinder in steps of 3° until the knocking ceases. It will then be advanced in steps of
0.75° until knocking recurs or until the original timing is restored.
Knock Sensor
The B234 engine's knock sensor contains a piezoelectric element which produces an electric current when subjected to pressure.
When knocking occurs in any of the cylinders it gives rise to severe vibration in the engine block, causing the sensor to generate alternating current. In
