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

Kia Optima DL3 2019-2022 Service and Repair Manual / Engine Control / Fuel System / Engine Control System / Knock Sensor (KS)

Specifications
Specification

Item
Specification
Capacitance (pF)
850 - 1,150

Description and operation
Description

Knocking is a condition 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.

Components and components location
Components Location

1. Knock Sensor (KS)


Schematic diagrams
Circuit Diagram

Harness Connector

Repair procedures
Inspection
1.

The engine control system can be more quickly diagnosed for troubles by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")

KDS provides the following information.

(1)

Self diagnosis : Inspects and displays diagnostic trouble code (DTC)

(2)

Sensor data : Checks the system input/output value status

(3)

Forced operation : Checks the system operating status

(4)

Additional function : Controls system options, zero point adjustment and other functions

Component Inspection
1.

Turn the ignition switch OFF.

2.

Disconnect the knock sensor connector.

3.

Measure resistance between the knock sensor terminals 1 and 2.

4.

Check that the resistance is within the specification.

Specification: Approximately. 4.87 MΩ [20°C (68°F)]

Removal
1.

Disconnect the negative battery 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)

Installation
  

Install the component with the specified torque.

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.

Camshaft Position Sensor (CMPS)
Description and operation Description • Camshaft Position Sensor (CMPS) is a hall sensor, which detects the camshaft position by using a hall element. ...

Heated Oxygen Sensor (HO2S)
Description and operation Description • Heated Oxygen Sensor (HO2S), consisting of zirconium and alumina, is installed on both upstream and downstream of the Manifol ...

Other information:

Kia Optima DL3 2019-2022 Owner's Manual: Certification label


The certification label is located on the driver's door sill at the center pillar. This label shows the maximum allowable weight of the fully loaded vehicle. This is called the GVWR (Gross Vehicle Weight Rating). The GVWR includes the weight of the vehicle, all occupants, fuel and cargo. This ...

Kia Optima DL3 2019-2022 Owner's Manual: Stop and tail lamp bulb replacement


1. Open the trunk lid. 2. Open the service cover. 3. Remove the nuts from the vehicle. 4. Disconnect the rear combination lamp connector. 5. Remove the rear combination lamp assembly from the body of the vehicle. 6. Remove the socket from the assembly by turning the socket counterclockw ...

Copyright © www.kioptima.com 2017-2022