Wondered if some one could help. Is there any way to tell if the P.C.M. is shot, other than a scan tool. I have a 97 DODGE 15OO. 5.2 and i tried to hook a scan tool and it never could connect link with my P.C.M. I tried to read trouble codes by turning on/off the key like the maintence manuel says but for some reason my check engine light is not working either. can these problems be related? my truck will turn over but not start! no spark! Any suggestions.