Have an '87 Buick Park Avenue we'd like to diagnos a problem on. It would
really be helpful if we had a "scan tool", however they are stupidly
expensive. I've done some searches and it looks like the data that comes out
of the ECM is simplly serial data at 8192bps at 12V voltage levels. Does
anybody have more info on this? Is the output text or is it just a bunch of
hex digits? If so anybody have a mapping for which hex digits mean what? For
now I'll be using a PC laptop but it sounds like this might be something I
can build with a PIC if I can find this info. Thanks for any help. TTYL

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