Even though your vehicle is equipped with the OCS, never install a child restraint in the front passenger's seat. An inflating air bag can forcefully strike a child or child restraint resulting in serious or fatal injury.
WARNING
Hyundai Elantra AD (2016-2020) Service Manual: Intake Actuator Repair procedures
Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the intake actuator connector.
3.
Verify that the intake actuator operates to the fresh position when connecting 12V to terminal 3 and grounding terminal 4.
Verify that the intake actuator operates to the recirculation position w ...
Hyundai Elantra AD (2016-2020) Service Manual: Canister Close Valve (CCV) Specifications
Specification
ItemSpecificationCoil Resistance (?)19.5 ~ 22.5 [20°C(68°F)]
...