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: Repair procedures
Removal 1. Remove the front bumper cover. (Refer to Body - "Front Bumper Cover") 2. Remove the high pitch horn and low pitch horn after disconnect the horn connector (A) and loosening the mounting the bolt. [Low Pitch Horn] [High Pitch Horn] Installation 1. Install the horns after ...

Hyundai Elantra AD (2016-2020) Service Manual: Passenger Airbag (PAB) Module Components and Components Location
Components 1. Passenger Air Bag (PAB) ...

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