Elantra GLS Wagon L4-2.0L (2000)
Knock Sensor: Testing and Inspection
The knock sensor is attached to the cylinder block and senses engine knocking conditions.
A knocking vibration from the cylinder block is applied as pressure to the piezoelectric element. This vibrational pressure is then converted into a
voltage signal which is delivered as output. If engine knocking occurs, ignition timing is retarded to suppress it.
Circuit Diagram
