Oh yeah, my Cobra (Ford 5.0 engine) has this as well -- jumper 2 wires and the codes are flashed on the check-engine light. Might be good to find a Buick club, user group, etc for this info. Cheers, -Neil. ----- Original Message ----- From: "John Ferrell" To: Sent: Tuesday, February 26, 2002 11:09 AM Subject: Re: [EE]: OBDI tools? > It has been a while since I looked at this, but my '85 Cadillac had an > arrangement where there were two wires in the service connector that > activated the diagnostic function. The service codes would be flashed in an > indicator (check engine?) on the instrument panel. Resting codes involved > disconnecting the battery, I think. > > The MAFS (mass airflow sensor) frequently complained in high humidity. I > finally just gave up on it, the new ones were no better than the old ones! > > Perhaps the '87 GM cars were more helpful. > > John Ferrell > 6241 Phillippi Rd > Julian NC 27283 > Phone: (336)685-9606 > Dixie Competition Products > NSRCA 479 AMA 4190 W8CCW > "My Competition is Not My Enemy" > > > > ----- Original Message ----- > From: "Herbert Graf" > To: > Sent: Tuesday, February 26, 2002 11:18 AM > Subject: [EE]: OBDI tools? > > > > 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 > > > > -- > > http://www.piclist.com hint: PICList Posts must start with ONE topic: > > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > > > > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads