Knock Sensor (KS)

Description and Operation

Description

Knock is a phenomenon characterized by undesirable vibration and noise and can lead to engine damage. Two knock sensors (KS) are installed inside the V-shaped recess of the cylinder block and detect engine knock. When knock occurs, the vibration of the cylinder block is transmitted as pressure to the piezoelectric element, and the sensor outputs a voltage signal to the ECM. Upon receiving this signal, the ECM controls the ignition timing by retarding the ignition timing, and then advances the ignition timing when the knock disappears. This sequential control can improve engine output, torque, and fuel economy.

Specifications

Specification

Item	Specification
Capacitance (pF)	850 - 1150
Resistance (MΩ)	3,90 - 5,84
Pin	2

Circuit Diagrams

Wiring Diagram

Harness Connector

Repair Procedures

Removal

1. 1
   Turn the ignition switch OFF and disconnect the negative (-) battery terminal.
2. 2
   Disconnect the knock sensor connector (A). [Knock Sensor (Bank 1)]

   

   [Knock Sensor (Bank 2)]

   

3. 3
   Remove the intake manifold. (Refer to Engine Mechanical System - "Intake Manifold")
4. 4
   Remove the mounting bolt (A) and remove the sensor from the cylinder block. Knock sensor mounting bolt: 15.7–24 N·m [Knock Sensor (Bank 1)]

   

   [Knock Sensor (Bank 2)]

   

Installation

Install the component to the specified torque. Be careful not to drop the component, as internal damage may occur. If dropped, inspect it before use. The sensor connector must be installed parallel to the engine.

1. Install in the reverse order of removal.