NM, found the obvious ars bolt holding the harness on the otherside of the ECU. Damn, I just need to slow down a little

 

Sorry I do not understand either question.
The pinouts for the ECU, EEC or PCM computers for the 5.0 are all in the same location on the plug for the OBD I.

The harness should be on the front of the ECU in the engine compartment with a 10 mm bolt head.


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good short compter harness pin22 to diag pin6
HARNESS
good 12VDC pin1
good KO 12VDC 37 & 57
good GND 40 & 60

So it proves bad ECU?

 

Yea, thanks SUB. I knew the harness was held on by a bolt, but didnt comprend to check engine side of the firewall. I felt like a meat head when I found it, since I was tuggin on the computer for 5min, before i thought to check. DUHh

 

Sounds that way but you could have one chip bad in the computer (you can open it up to look) the one that grounds pin #22.
Others have drove this way with a toggle switch on pin #6 of the test connector to ground.
But I would not recommend it for safety reasons.

 

hey sub, Are both relays created equal?
For S&G i ohm'd out the pins on both & the green one has a 65ohm short pin#1-2... Brown is reading 1.5 Mohm same pins

 

I'm assuming these pins are the coil, & should be the same.
Green one bad?

 

ok i was wrong. A trip to autozone confirmed same resistance on both new relay coils... Any other tests that can help conlude bad computer?

 

I would think they would be close to the same. I think one of the two relays is rated at a little higher current capacity then the other.



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sub u called it, computer problems.!
opened it up & found a cap bad. I ran up to Radio Shack, thinking a fix was close....But, once i got it soldered in. i noticed an ic chip hiding behind a vertical PCB with a few pins that were also toasted. All the parts stores have to order it. So I'm hoping Rusty Acres (a local ford only parts yard) has one I can use.
You don’t happen to have a schematic of the EEC do ya? I'm curious if I did anything while I was working on the fuel system to cause the failure.

Figures, more money out of pocket, just to sell it. At least I did fix the annihilated gear on the passenger side window motor.

 

As far as I know there were at least three different manufactures making the computers for ford and from what I can gather they all used a different diagram to make the same thing. You can open two up with the same part number and program number an they will be very different. They will even use different chips and chip manufactures.

Here is a diagram of the circuit you have been working with from one computer:



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Almost forgot, 80 bucks later for a new computer & the truck started like nothin happened.
Thanks again Sub, for helping me through the troubleshooting