Went to this thread:

Planet

I found all of the checks you can do for no CEL and always on CEL.

Too bad they didn't help. I was about to resign myself to having it towed when I wondered if there was just a bad ground or connection in the ECM. So I turned the key to "ON', got no CEL of course, then tapped on the ECM. CEL came on, went to "Start" and it started right up.

Good thing I didn't get so disgusted that I used a BFH on the ECM.