Vacuum Chamber

Remove vacuum chamber. Visually inspect vacuum chamber for clogging, cracks and damage. Apply air pressure to port "A" and ensure air flows from port "B". See Fig 1 . Apply air pressure to port "B". Air should flow from port "A". Replace vacuum chamber as necessary.

Fig 1: Testing Vacuum Chamber (Protege 1.8L)

Courtesy of MAZDA MOTORS CORP.