Knock Sensor: Description and Operation

Knock Sensor:

The knock sensor's piezoelectric element detects engine detonation. It sends a voltage signal to the ECU. It is located on the top of the engine block on the R/H side.

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