Operation CHARM: Car repair manuals for everyone.
Home >> Hyundai >> 2007 >> Sonata L4-2.4L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Knock Sensor (KS)
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Knock Sensor (KS)

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
pro multis · About Operation CHARM