During 4 Cylinder Mode
With rocker arm oil control solenoid B (Bank 1) and A (Bank 2) turned on by the PCM, the front and rear rocker arm oil control valves switch the oil pressure. Oil pressure then enters the No. 3 and No. 4 cylinder's primary rocker arm from the oil passage in the rocker shaft, causing the VTEC switching piston to slide into the secondary rocker arm and against the return spring. This disengages the primary rocker arm from the secondary rocker arm to stop valve activation. The No. 3 and No. 4 cylinder's rocker arms do not move, and the No. 3 and No. 4 cylinders are paused. In the other four cylinders, oil pressure from the rear rocker arm oil control valve locks the primary rocker arms and secondary rocker arms together. The rocker arms are moved by the camshaft, and the four cylinders are active.