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

Kia Forte 2019-2022 (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.

Camshaft Position Sensor (CMPS)
Description and operation Description Camshaft Position Sensor (CMPS) is a hall sensor and detects the camshaft position by using a hall element. It is related with Crankshaft Positi ...

Heated Oxygen Sensor (HO2S)
Specifications Specification HO2S [Bank 1/Sensor 1] (Linear type) Item Specification Heater Resistance (Ω) 2.4 - 4.0 [20°C(68 ...

Other information:

Kia Forte 2019-2022 (BD) Owners Manual: Smart key precautions


If you lose your smart key, you will not be able to start the engine. Tow the vehicle, if necessary, and contact an authorized Kia dealer. A maximum of 2 smart keys can be registered to a single vehicle. If you lose a smart key, you should immediately take the vehicle and k ...

Kia Forte 2019-2022 (BD) Owners Manual: Disarmed stage


The system will be disarmed when: Transmitter - The door unlock button is pressed. - The engine is started. (within 3 seconds) - The ignition switch is in the "ON" position for 30 seconds or more. Smart key - The door unlock button is pressed. - The button of the front outside door i ...

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