ACD: Active Center Differential incorporates an electronically controlled hydraulic multi-plate clutch. An ECU optimizes clutch cover clamp load for different driving conditions, regulating the differential limiting action between free and locked states. The result is improved steering response together with better traction. ACD provides three modes — Tarmac / Gravel / Snow — to enable quicker control response for changes in road surface. A single ECU provides integrated management of both ACD and Super AYC components.