Knock Sensor: Testing and Inspection

KNOCK SENSOR (KS)




DESCRIPTION
The Knock Sensor is attached to the cylinder block and senses engine knocking. The sensor contains a piezoelectric element that converts vibration (or noise) into voltage signal and sends this signal to ECM. ECM uses this signal to suppress knocking by retarding ignition timing.

Circuit Diagram:

CIRCUIT DIAGRAM

HARNESS INSPECTION
Refer to DTC P0325 troubleshooting procedure.

SENSOR INSPECTION
1. Disconnect knock sensor connector.
2. Measure resistance between the terminals 1 and 2 of knock sensor connector.

Specification : Approx. 5 Mohms at 20 °C (68 °F)

3. Replace knock sensor if its resistance is not within the specification.

Tightening Torque : 190 - 240 kg.cm