ISX to X15 swap headache. PLEASE HELP

[weissman379]

So I did the engine swap and was fairly easy. The problem I'm having is the truck is not starting. It just cranks but doesn't attempt to start not even with starting fluid. My question is, what can I check to make sure my ecm is good. I'm getting 5v reference on all the sensors. Or is it not starting cause I need to reflash the ecm for the for the new specs on the x15. I don't have a laptop right now to look on insite will be getting one in a couple of days. Any help is appreciated.