Variable Cylinder Management (VCM)

Variable Cylinder Management (VCM) is a Honda's term for a variable displacement technology.

Variable Cylinder Management (VCM) uses:

1. i-VTEC system to disable one bank of cylinder during specific driving conditions.
2. Overhead cams as oppose to: Multi-Displacement System and General Motor's Active Fuel Management (OHV) system.
3. Solenoids to unlock the cam followers on one bank from their respective rockers, so the cam follower floats freely while the valve springs keep the valves closed.
   

During start-up, acceleration, climbing hills or when high power output is required. The engine operates on all six cylinders. During moderate rate speed cruising and at low engine loads, the system operates just one bank of three cylinder. For high speed cruising and moderate acceleration including mid hills, the engine operates only on four cylinders.

The engine drive by wire throttle allows the engine management computer to smooth out the engine's delivery. (making the system imperceptible)

Vehicle that equipped with VCM system:

1. Are equipped with an "CEO" indicator on the dashboard which corresponds to the VCM system's operation.
2. 
   
   Include Active Noise Cancellation (ANC). That nullifies unwanted noise by generating out-of-phase sound waves that may occur due to the harmonics of cylinder operation.
3. Include Active Control Engine Mount (ACM) system. That cancels out engine vibration, ensuring a smoother, more comfortable ride.

Vehicle that equipped with VCM system:

1. 2003 Honda Inspire
2. 2005-2007 Honda Accord Hybrids (JNA1)
3. 2005+ Honda Odyssey EX-L and Touring Models only (J35)
4. 2006+ Honda Civic Hybrid
5. 2006+ Honda Pilot 2WD Models only (J35)
6. 2008 Honda Accord except EX-L V6 6MT Coupe
7. 2009+ Honda Pilot (all models)