| Description |

| Engine condition | VIS valve | Operation |
| Medium speed | Closed | Increasing engine performance in low engine speed by reducing intake interference among cylinders |
| Low / High speed | Open | Minimizing intake resistance by shortening intake manifold length and increasing area of air entrance |

CVVT Oil Control Valve (OCV) Repair procedures
Variable Intake Solenoid (VIS) Valve SpecificationsHyundai Elantra AD (2016-2020) Owners Manual: Instrument Cluster Control
Adjusting instrument cluster illumination
When the vehicle's parking lights or headlights are on, press the illumination
control button to adjust the brightness of the instrument panel illumination.
When pressing the illumination control button, the interior switch illumination
intensity ...
Hyundai Elantra AD (2016-2020) Service Manual: Drive Belt Repair procedures
Removal
1.
Remove the drive belt.
(1)
Using the wrench, turning the drive belt tensioner (A) counterclockwise.
(2)
Disconnect the drive belt (A).
(3)
Remove the drive belt tensioner (A) and then remove the drive belt (B).
Inspection
1.
Check belt for maintenance and abnormal wea ...