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

Kia Picanto JA 2017-2025 Service & Repair Manual / Engine Control / Fuel System / Engine Control System / Knock Sensor (KS)

Specifications

Specification

Item	Specification
Resistance(MΩ)	4.87
Capacitance (pF)	850 - 1150
Type	Piezo-electricity
Pin	2

Description and operation

Description

Knocking is a phenomenon characterized by undesirable vibration and noise that can cause engine damage. Installed on the cylinder block, Knock Sensor (KS) senses engine knocking.

When knocking occurs, the vibration from the cylinder block is applied as pressure to the piezoelectric element. When knocking 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

[A/T]

[M/T]

Repair procedures

Removal

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 delivery pipe. (Refer to Fuel Delivery System - "Delivery Pipe")

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)

Installation

•	Install the component to the specified torques.

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

1.	Install in the reverse order of removal.

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