EEC-IV self test not working

Reply Subscribe

Thread Tools

Search this Thread

Nov 25, 2007 | 11:16 AM

DrFord

Thread Starter

More Turbo

Joined: Jun 2001

Posts: 571

Likes: 1

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.

Last edited by DrFord; Nov 25, 2007 at 11:34 AM.

Nov 25, 2007 | 12:42 PM

Franklin2

Moderator

Joined: Jan 2001

Posts: 56,966

Likes: 2,728

From: Virginia

Here's some things to check

http://www.fordfuelinjection.com/index.php?p=44

How are you grounding the single wire connector?

Nov 25, 2007 | 12:47 PM

DrFord

Thread Starter

More Turbo

Joined: Jun 2001

Posts: 571

Likes: 1

Quote:

Originally Posted by Franklin2

How are you grounding the single wire connector?

I am just jumping the single wire over to signal retern wire on the main harnest. (pin # 2 I think)

Here, I found a diagram of how I do it. It has always worked before.

http://www.thorssell.net/hbook/eectest.html

Nov 25, 2007 | 12:54 PM

Franklin2

Moderator

Joined: Jan 2001

Posts: 56,966

Likes: 2,728

From: Virginia

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.

Nov 25, 2007 | 02:41 PM

DrFord

Thread Starter

More Turbo

Joined: Jun 2001

Posts: 571

Likes: 1

Quote:

Originally Posted by Franklin2

Well I was having some problem with the engine running very poorly. I think I might have fixed that. As for the codes though, I tried to pull them and when I couldn't, I figured something was bad somewhere. I am kinda leaning toward a wire has gone to ground somewhere. Just was wanting to fix it if it was nothing to detailed.

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!!

Nov 25, 2007 | 08:41 PM

Franklin2

Moderator

Joined: Jan 2001

Posts: 56,966

Likes: 2,728

From: Virginia

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.