Check Valve
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 Mazda Protege5, 2002 Mazda Protege, 2002 Mazda Millenia, 2002 Mazda MX-5 Miata, and 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
Remove check valve. For 626, see VACUUM DIAGRAMS article. For Millenia, see Figure . On all models, apply air pressure to port "A" (White port) of check valve. Air should flow from port "B". Apply air pressure to port "B" (Green port) of check valve. Air should not flow from port "A". Replace check valve as necessary.