9000 CSE V6-2962cc 3.0L DOHC (B308) (1996)
Knock Sensor: Description and Operation
The B308 engine has two identical knock sensors, one for the front and one for the rear bank of cylinders. On the basis of information supplied by the
camshaft position sensor, the control module knows which cylinder is under compression when ignition occurs. Each 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
the case of extremely severe knocking, the current generated in this way could amount to about 500 mV AC.
The knock sensors are mounted on the cylinder banks by means of a through bolt. Tightening torque is extremely important for proper operation of the
sensors and should therefore be strictly observed.
Tightening torque: 22 Nm (16 ft lbs).