what causes a truck to suddenly not start 1998 toyota pu
Your missing one of three things for combustion, air, fuel and spark. Hard to make a diagnosis with the info in your question.
maybe the battery cables, or the starter, or could be out of oil, or water , or a sensor went out. or try jumping it ,& after it start disconect a battery cable to see if car turns off. if so, then bad altenator .you can allways buy code reader from auto store cheap. good luck.