VCM deactivates the cylinder by keeping the intake and exhaust valves in the closed position to halt fuel supply.

To accomplish this, it uses Honda’s original
VTEC (Variable Valve Timing and Lift Electronic Control) technology.

Valve-idling mechanism

To deactivate the cylinder, the pin is moved hydraulically to disengage the rocker arm that pushes down the valves. In this mode, even though the cam pushes up the rocker arm, it has no effect and the valves remain closed.