System Inspection - MPV

Remove PCV valve from valve cover. Blow air into port "A". See Fig 1 . Air should flow from port "C". Blow air into port "B". Air should flow from port "C". Blow air into ports "B" or "C". Air should not flow from port "A". Repair as necessary. If hose is okay, replace PCV valve.

Fig 1: Identifying PCV Valve Ports (MPV)

Courtesy of MAZDA MOTORS CORP.