Hyundai Elantra: 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. 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.

Camshaft Position Sensor (CMPS) Repair procedures
Inspection 1. Check the signal waveform of the CMPS and CKPS using the GDS. Specification : Refer to "Wave Form" Removal     • DON’T remove the camshaft positi ...

Knock Sensor (KS) Specifications
Specification ItemSpecificationCapacitance (pF)850 ~ 1,150 ...

Other information:

Hyundai Elantra AD (2016-2020) Service Manual: Side Impact Sensor (SIS) Description and Operation
Description • Side Impact Sensors (SIS), each installed on the center part of the right and left front door modules and the right and left center pillars, detects side impact during collision. • The SRSCM uses the signals from SIS during side collision to determine whether and w ...

Hyundai Elantra AD (2016-2020) Service Manual: Fuel Filler Door
Components and Components Location Component Location 1. Fuel filler door Repair procedures Replacement [Fuel filler door]     • Put on gloves to prevent hand injuries.     • When removing with a flat-tip screwdriver or remover, wrap ...

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