Is my computer damaged or do i have a bad ecm relay?
1990 Ford F-150

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

(1990 Ford F-150)
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
1 answer & 1 comment
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
General Diagnosis
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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.
Sign in to reply
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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