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Is my computer damaged or do i have a bad ecm relay?

(1990 Ford F-150)
in Richmond, VA on August 08, 2011
i was doinf a self test on the truck trying to see if i had any stored codes...truck was running fine after i put a iat sensor on it,anyway i hooked the pos.wire into the pin where your supposed to hook to communicate with the ecm...well after that the truck would not start,i waited an hour and truck runs but i have to hold the throttle some,it will not idle on its own.i figure i likely damaged the ecm but wanted to check relays?so i have the battery unhooked for the nite and will try again tommorow otherwise i figure on a new ecm from advance...any suggestions would greatly be appreciated,thanks
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Popular Answer
ECM's are easily damaged if power or ground is supplied to a pin that shouldn't have that input. There are some companies that test and repair ECM's if your's is really expensive. I use Fuel Injection Corporation in Livermore CA they are really god and inexpensive.
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on August 09, 2011
hi,thanx for your quick answer.i would be interested to know if you believe that maybe a relay or fusable link may be blown(with the running condition i explaioned earlier),is there any type of diagram i can get online to tell me exactly what relay is what?by the way my truck is a 92 not a 90...i guess when i posted the page must have reset to where i clicked on...thanx
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