Subaru LEGACY 2002 Quick Reference Index page 80

Fuel Injection (Fuel System)
E: KNOCK SENSOR
! The knock sensor is installed on the cylinder block, and senses knocking that occurs in the en-
gine.
! The sensor is a piezo-electric type which converts vibration resulting from knocking into electric
signals.
! In addition to a piezo-electric element, the sensor has a weight and case as its components. If
knocking occurs in the engine, the weight in the case moves causing the piezo-electric element to
generate a voltage.
! The knock sensor harness is connected to the bulkhead harness.
(1) Nut
(2) Weight
(3) Resistor
(4) Housing
(5) Piezo-electric element
SENSORS AND SWITCHES
FU-22
A: To knock sensor harness
B2H1998B