Hyundai Sonata: 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 pos ...
Specification
ItemSpecificationResistance(M?)4.87
...
Other information:
Hyundai Sonata LF 2014-2019 Owners Manual: Blind spot mirror
The Blind Spot Mirror (BSM) is a supplemental mirror that reduces the driver’s
blind spot by showing the rear side area of the vehicle. The blind spot mirror is
equipped on the left-hand side view mirror.
WARNING
Always check the road condition while driving for unexpected situations
even t ...
Hyundai Sonata LF 2014-2019 Service Manual: Audio Unit Repair procedures
Removal
1.
Disconnect the negative (-) battery terminal.
2.
Remove the cluster fascia upper panal.
(Refer to Body - "Cluster Fascia Upper Panel")
3.
Remove the audio head unit (A) after loosening the screws.
4.
Remove the audio head unit after disconnecting the connectors and cable ...