LW2 V6-3.0L VIN R (2000)
Knock Sensor: Description and Operation
The knock sensors in the vehicle serve to detect abnormal vibration (spark knocking). There is a knock sensor on each of the two cylinder banks. Engine
vibration causes the piezo-electric device within the knock sensor to send an AC signal to the ECM. The ECM will retard timing to a maximum
correction based on the signal. The ECM is capable of detecting too much noise and too little noise. A noise level reading is taken at idle and used as a
reference reading. There is a time frame around the TDC combustion event when the knock sensor signal is considered by the ECM.