Knock Sensor: Description and Operation

Fig. 56 Knock Sensor:

PURPOSE
The knock sensor's piezoelectric element detects engine detonation. It sends a voltage signal to the ECM.

LOCATION
In the engine block, firewall side.

Knock Sensor:

CONSTRUCTION
(C) The knock sensor, consists of a (3) housing a (4) piezoelectric crystal mounted on a (5) threaded sleeve between (6) two connector strips. One side of the assembly is fitted with a (7) damping weight and (8) spring washer secured by a (9) nut.