EEC-IV self test not working
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EEC-IV self test not working
I know there is a thread similar to this just below, but I did not want to hi-jack it. Plus I don't believe our systems are the same 
Engine is a 4.9L 300 in an 88 F-150. I can not pull the codes off of the PCM. I do not have a code reader, so I use the light bulb way. I have done this several time before and know how it works. But now when I hook it up, the light will come on and then it will go out when I turn the key to the on position and will never flash or come on again until I turn the key back off.
What might have gotten blown?? And how can I check it?
Thanks for the help.
Engine is a 4.9L 300 in an 88 F-150. I can not pull the codes off of the PCM. I do not have a code reader, so I use the light bulb way. I have done this several time before and know how it works. But now when I hook it up, the light will come on and then it will go out when I turn the key to the on position and will never flash or come on again until I turn the key back off.
What might have gotten blown?? And how can I check it?
Thanks for the help.
Last edited by DrFord; Nov 25, 2007 at 11:34 AM.
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From: Virginia
Here's some things to check
http://www.fordfuelinjection.com/index.php?p=44
How are you grounding the single wire connector?
http://www.fordfuelinjection.com/index.php?p=44
How are you grounding the single wire connector?
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Originally Posted by Franklin2
How are you grounding the single wire connector?
Here, I found a diagram of how I do it. It has always worked before.
http://www.thorssell.net/hbook/eectest.html
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Why do you want to download the codes? Do you have a serious no start condition? That may point to a major power or grounding problem to the EEC if that's the case, which could kill it, and it not be able to send any codes.
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Originally Posted by Franklin2
Why do you want to download the codes? Do you have a serious no start condition? That may point to a major power or grounding problem to the EEC if that's the case, which could kill it, and it not be able to send any codes.
Here is an interesting one for ya too. when I disconnect the negative side of the battery and turn the key to "on" the check engine light will come on. Not fully bright, but more than just a dim burn too. Pretty cool huh lol. This is why I am thinking something has gone to ground.
P.S. I tried hooking it up as per that link you gave me and no go on it too. It did have some handy check points on it though. I will definatly give them a test. Thanks!!
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Look over there at the battery neg terminal. See if it has a small wire coming off the bat neg cable, and going over to a ground point for the computer. Some trucks had a connector in this wire that corrodes.
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