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 Sounds like either a major prob with the eec or a simple problem like wire harness shorts(possibly intermittent)  Do you have access to a DMM? (digital multimeter) You need to get an ohm meter at the wire harness.  Get a wiring diagram of your car (public libraries have chiltons on microfilm sometimes.  But once you have a wire diagram,  see if you can't find any shorts.  I know, it sucks a whole lot having electrical problems, imagine this...   A squirrel chewed up my main harness connector that goes into the car through the firewall (the one that carries all the wires to the eec)  I had to go at it with a soldering iron and a wiring diagram until I got it back together, I still have some minor probs from it.  But, the self test thing sounds like either, you have some weird short that causes it to think you've got a scan tool attached, or the eec is screwed.  Good luck man.
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 Michael Black
 Quantum Motorsports
 Norman, Oklahoma
 
 1988 Merc Cougar 5.0 HO, P&Ped heads, 2.25" custom mandrel bent dual pipes, T5 five speed tranny
 15.43 @ 91.08mph  (not shabby for a 3600 pound car)
 60'  2.453   Street tires suck!!!
 
 
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