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 the air flow entering into the 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.