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

Kia Rio 2017-2021 YB Service Manual / Engine Control / Fuel System / Engine Control System / Knock Sensor (KS)

Specifications
Specification

Knock Sensor (KS)

Item
Specification
Resistance(MΩ)
4.87
Capacitance (pF)
950 ~ 1,350
Type
Piezo-electricity
Pin
2

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. 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

Repair procedures
Removal
1.

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

2.

Remove the intake manifold.

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

3.

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

Knock sensor installation bolt:

18.6 - 23.5 N.m (1.9 - 2.4 kgf.m, 13.7 - 17.4 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.

Installation is reverse of removal.

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