This post is from a few months ago, but if you are still having problems, it could be a short by the computer ( in the harness wiring ). I had a similar problem in a chevy van except the vehicle was a no start. Would try to start but nothing more.
After checking and making sure the wiring is good:
If the error codes change or there are a lot of different odd ones, then a used computer could be the fix. Cost for me is about 50 dollars at a local salvage yard. Make sure when you get one that the EPROM is still installed. Some places will take the EPROM out and have you use your own ( since the EPROM can be sold seperately ).
Best of luck!