Function And Operation Principle
The Variable Charge Motion Actuator (VCMA) is installed to the inlet of combustion chambers in 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 emission gas by increasing air/fuel mixture.