Hyundai Elantra: Engine Control System / Knock Sensor (KS) Description and Operation
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.

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 ...
Specification
ItemSpecificationCapacitance (pF)850 ~ 1,150
...
Other information:
Hyundai Elantra AD (2016-2020) Owners Manual: Smart Trunk
On a vehicle equipped with a smart key, the trunk can be opened using the Smart
Trunk system.
How to use the Smart Trunk
The trunk can be opened with notouch activation satisfying all the conditions
below.
After 15 seconds when all doors are closed and locked
Positioned in the detectin ...
Hyundai Elantra AD (2016-2020) Service Manual: Description and Operation
Description
The starting system includes the battery, starter, solenoid
switch, ignition switch, inhibitor switch (A/T), clutch pedal switch
(M/T), ignition lock switch, connection wires and the battery cable.
When the ignition key is turned to the start position, current flows and energizes ...