Vacuum Line Inspection (MILLENIA S)
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 the clamps and the hose. Apply both suction and pressure to the engine-side of the hose, and verify that air flows only toward that side. See Fig 1 . If air flows in both directions or not at all, replace the vacuum hose. When installing hose, ensure arrow is pointing in the right direction.