Kia Rio YB Quiz
Engine Control System/Fuel System

Knock Sensor (KS)

In this manual: Engine Control System/Fuel System
General Information — 8Maintenance — 31Engine Mechanical System — 44Engine Electrical System — 14Emission Control System — 9Engine Control System/Fuel System — 30Clutch System — 10Manual Transmission — 10Automatic Transmission — 23Drive Shaft and Axle — 8Suspension System — 15Steering — 9Restraints — 14Brake System — 22Body (Interior and Exterior) — 115Body Electrical System — 84Heating, Ventilation, and Air Conditioning — 28
3steps
~18min
2/5difficulty
0102030405023.517N·mlb·ft
Tightening torque found on this page
Done 0 of 3

Specifications

Specification

Knock Sensor (KS)

Item Specification
Resistance (MΩ) 4,87
Capacitance (pF) 950 ~ 1350
Type Piezoelectric
Pin 2

Description and Operation

Description

Knock is a phenomenon characterized by undesirable vibration and noise, and it may cause engine damage. The Knock Sensor (KS) is installed on the cylinder block and detects engine knocking.

When knocking occurs, the vibration of the cylinder block is transmitted as pressure to the piezoelectric element. At this time, this sensor sends a voltage signal exceeding the specified value to the ECM, and the ECM retards the ignition timing angle. If knocking disappears after the ignition timing is retarded, the ECM advances the ignition timing. This sequential control can improve engine power, torque and fuel economy.

Circuit Diagrams

Wiring Diagram

Repair Procedures

Removal

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

  2. Remove the intake manifold.

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

  3. Loosen the mounting bolt (A) and remove the sensor from the cylinder block.

    Knock Sensor Mounting Bolt:

    18,6–24 N·m

Installation

  1. Installation is the reverse of removal.

Test yourself

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