Hyundai Elantra MD/UD: Variable Charge Motion Actuator (VCMA). Description and Operation
Description
The Variable Charge Motion Actuator (VCMA) is installed on the inlet of
the intake manifold.
It consists of a DC motor which actuates the VCM valve and a position
sensor which detects the position of the VCM valve.
The VCM system tumbles air flow entering into combustion chamber of each
cylinder by closing the VCM valve in the cold start conditions.
This tumble effect reduces cold start emissions by improving atomization
