Sounds like what you have is called stem wall. The footer is poured well below grade, supporting the walls. The garage floor is poured after using the walls as a form sort of speak. What you need to do is remove the garage floor, check the type of dirt you have under it making sure you don't have some sort of muck or organic material(creating a sink hole). You need to bring in a good base, like road rock. It needs to be compacted properly. If you have termite issues where you live then you need to have it treated for such. Lay down a moisture barrier(visqueen). Then repour your concrete using minimum 3000 lb concrete with 6x6 road mesh (or fibre)poured to 6in thick. 4 inch is minimum but 6in is nice. As Deadhead says make sure water is directed away from your house.
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