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) Owners Manual: Rear Seats
Folding the rear seat The rear seatbacks can be folded to facilitate carrying long items or to increase the luggage capacity of the vehicle. WARNING Never allow passengers to sit on top of the folded down seatback while the vehicle is moving. This is not a proper seating position and no s ...

Hyundai Elantra AD (2016-2020) Owners Manual: Manual Climate Control System
To defog inside windshield 1. Select any fan speed except “0” position. 2. Select desired temperature. 3. Select the or position. 4. The outside (fresh) air will be selected automatically. Additionally, the air conditioning will automatically operate if the mode is selected to the p ...

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