If the engine cranks but does not start, it may be caused by a tripped inertia switch. Switch the key to "ON" and the fuel pump should be heard running for a second or two. Listen at the gas filler if necessary. If you do not hear the pump the inertia switch should be reset, it will "click" when it is reset.
Car Problem Reports
Mazda 626 Crank but No Start Condition
Mazda 626 Problem
Engines Affected: 2.0L 4 Cylinder, 2.5L V6
Average Mileage: 154,333 mi (100,003 mi - 220,000 mi)
Visitor, 2002 Mazda 626, 2.0L 4 Cylinder, 151,000 mi
engine cranck but won't start. I can not find inertia switch
Visitor, 1998 Mazda 626, 2.0L 4 Cylinder, 161,000 mi
replaced battery and hauled in on rollback lights blink and horn blows cranks over but will not start. acts as though the security system is shutting it down.