EGR Vent Solenoid Valve
WARNING: This page is about a different car, the 1995 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
Remove EGR vacuum solenoid. Air should flow through all 3 ports with power not applied to valve. With 12 volts applied to vent solenoid, air should flow through ports "A" and "B" only. See Fig 1 . Air should NOT pass through port "C" with power applied.