Hyundai Elantra: Engine Control System / Knock Sensor (KS)

Hyundai Elantra (CN7) 2021-2025 Service Manual / Engine Control / Fuel System / Engine Control System / Knock Sensor (KS)

Description and operation

Description

Knocking is a phenomenon characterized by undesirable vibration and noise and can cause engine damage.

Knock Sensor (KS) is installed on the cylinder block and senses engine knocking. When knocking occurs, the vibration from the cylinder block is applied as pressure to the piezoelectric element. At this time, this sensor transfers the voltage signal higher than the specified value to the ECM and the ECM retards the ignition timing.

Specifications

Specification

Item	Specification
Capacitance (pF)	850 - 1150
Resistance (MΩ)	R > 1

Schematic diagrams

Circuit Diagram

Harness Connector

Repair procedures

Removal

1.	Turn ignition switch OFF and disconnect the battery negative (-) terminal

2.	Disconnect the knock sensor connector (A).

Remove the installation bolt (A), and then remove the sensor from the cylinder block.

Tightening Torque :

18.6 - 24.5 N.m (1.9 - 2.5 kgf.m, 13.7 - 18.1 lb-ft)

Installation

•	Install the component with the specified torques.

•	Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.

1.	Install in the reverse order of removal.

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