There is a bypass tube that connects between the two molded rubber pieces that the ICV sits between. I have attached pictures of the two molded rubber pieces and there is a picture of the pinched off bypass tube (PN A1169971652) in post # 4 in the following link
M117 air hose ID help (Apparently I can't attach the same picture to this post since I already attached it the other post). The molded rubber parts are part #'s 77 and 83 on the attached pdf and the pinched off tube is part #86. On some applications a hollow tube is substituted for the the pinched off tube in which case more air is permitted to bypass the ICV. Substitution of a pinched off tube for the hollow tube eliminates this bypass air and, in a system that is otherwise flowing too much air, will reduce the idle rate.
Mark