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