Impreza WRX F4-2.0L DOHC Turbo (2004)
Knock Sensor: Description and Operation
-
The knock sensor is installed on the cylinder block, and senses knocking that occurs in the engine.
-
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.
