Hyundai Creta: Engine Control System / Knock Sensor (KS)

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. 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.

Specifications

Specification
Item
Specification
Capacitance (pF)
950 ~ 1,350
Resistance(MΩ)
4.87

Schematic diagrams

Circuit Diagram
(M/T)

(A/T)

Repair procedures

Removal
1.
Turn the ignition switch OFF and disconnect the battery negative (-) terminal.
2.
Disconnect the knock sensor connector (A).

3.
Remove the mounting bolt (A), and then remove the sensor from the cylinder block.

Installation
  
Install the component with the specified torques.
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.
Knock sensor mounting bolt :
18.6 ~ 24.5 N.m (1.9 ~ 2.5 kgf.m, 13.7 ~ 18.1 lb-ft)
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