Inertia Fuel Shutoff (IFS) Switch
WARNING: This page is about a different car, the 1995 Mazda B4000, 1995 Mazda B3000, and 1995 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
IFS switch is located under instrument panel on passenger side. Unplug IFS switch electrical connector. Check for continuity between switch terminals. With switch not tripped (button on, switch down), continuity should exist. With switch tripped (button up), continuity should not exist. Replace switch as necessary.