I have a 1999 Jeep Grand Cherokee Limited with the anti theft system. My jeep was bought to a mechanic because my car would crank but not turn over, no fuel pressure and no power to the fuel pump. I put a new fuel pump in, new battery terminals, firestone put in a new battery and cam shaft sensor and the same thing is still happening it won't start. It towed over to a dealer and dodge told me my pcm is bad because their equipment wouldn't even read it. A new part costs $957 and I don't have that right now to spend. So I bought a used one from a junk yard, its comes with the ecu and pcm and all the part numbers match up, and both had an anti theft system, they told me I should have no problems and it should start up right away. My question is based off the location of the ecu and pcm on my jeep, and will I have to take any parts off to get to them. If you could possibly help me out with detailed instructions it would mean a lot.