ALDL Interfaces

[Teller.John at orbital.com]

I left the infamous paperclip in my Buick's ALDL connector after retrieving
some trouble codes.  My wife drove off in it and reported some very strange
engine performance problems!  Seemed to me like it was operating in "limp
home" mode...

--- John Teller





Padgett 0sirius <padgett at gdi.net> on 03/17/99 10:56:30 AM

Please respond to gmecm at efi332.eng.ohio-state.edu
                                                              
                                                              
                                                              
 To:      gmecm at efi332.eng.ohio-state.edu                     
                                                              
 cc:      (bcc: John Teller/ORBVA)                            
                                                              
                                                              
                                                              
 Subject: Re: ALDL Interfaces                                 
                                                              




At 09:14 PM 3/16/99 -0500, you wrote:
>Actually, Field service mode is normal driving mode with the Check engine
light flashing to indicate rich or lean...<

Have had engines act really strange in that mode (paper clip from A-B is
<=500 ohms) - is really to make the light blink trouble codes & suspect the
ECM ignores its other duties then. Should only be entered with engine off
and ignition on.
          A. Padgett Peterson, P.E. Cybernetic Psychophysicist
 Anti-Virus, Cryptographics, & Antique Radio Researcher
http://www.freivald.org/~padgett/index.html
 mailto:padgett at gdi.net     PGP 5.5 Key on request