Manifold Absolute Pressure (MAP) Sensor Solenoid Valve
WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
Remove MAP sensor solenoid valve. Solenoid valve is mounted on top of right shock tower. Apply air pressure to port "B" of solenoid valve. See Figure . Air from port "B" should flow from "C" only. Using jumper wires, apply battery voltage to solenoid valve terminals. Apply air pressure to port "A" of solenoid valve. Air should flow from port "B" only. Replace solenoid valve as necessary.