Kia Forte: Engine Control System / Knock Sensor (KS)

Kia Forte 2019-2020 (BD) Service Manual / Engine Control / Fuel System / Engine Control System / Knock Sensor (KS)

Specifications
Specification

Item
Specification
Resistance(MΩ)
4.87

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. When a knock occurs, the sensor produces voltage signal. The ECM retards the ignition timing when knocking occurs. If the knocking disappears after retarding the ignition timing, the ECM will advance the ignition timing. This sequential control can improve engine power, torque and fuel economy.

Schematic diagrams
Circuit Diagram

Harness Connector

Repair procedures
Removal & Installation
1.

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

2.

Remove the intake manifold.

(Refer to Engine Mechanical System - " Intake Manifold")

3.

Remove the knock sensor (A) after loosening the mounting bolt.

Knock sensor mounting bolt:

18.6 - 23.5 N·m (1.9 - 2.4 kgf·m, 13.7 - 17.4 lb·ft)

4.

Install in the reverse order of removal.

  

Install the component with the specified torques.

Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.

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Other information:

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