Same Print other half
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another one[/IMG]

 

I Hope this will help you Sorry for all the large pics everyone i'm just trying to show the whole thing

 

Here is how to start looking to troubleshoot code 67



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Top-left corner, we can see that the Neutral Drive Switch is connected to Pin 30.

Seems to be:

Computer -->| Diode -> Wye to ignition switch -> Neutral Drive Switch -> Starter Solenoid (relay).


What color is that wire? This, it seems, is what the computer is complaining about.

I have no idea where such a switch is located or what it looks like....

 

Well I got the two switches out of a wrecking yard today. One is activated by a rod when you press the clutch petal to the floor. The other switch is located below the rod and is activated when the clutch is fully released. Now that I have it properly hooked up the truck will not start unless the clutch is fully depressed. Previously this was jumpered and bypassed and the starter would turn over. Not a good idea at all. Now to check out and see if this corrects error 67.

 

here is the EEC IV Pin usage chart. which transmission is it? i will photo a detailed pic and location and instructions for the correct transmission directly from the ford truck shop manual . For C5 and C6
1.Remove the downshift linkage rod return spring at the low-servo cover.
2.Apply penetrating oil the outerlever attaching nut to prevent breaking the inner lever shaft. Remove the transmission downshift outer lever attaching nut and lever.
3.Remove The 2 Neutral start retaining bolts.
4.Disconnect the two multiple wire connectors.
Remove the switch from the transmission.
AOD Transmission.
Neutral switch is located on left side of trans near tail stock housing it unthreads from the top.
435 NEW PROCESS 4 Speed Only has reverse light switch located on left sied of shifter lever on top.
WARNER T19A and T-19C Back up lamp switch is located on top rear of Transmission.
WARNER T-18 Back up switch same as WARNER T-19A andT19C
FORD 3.03 TRS Switch located on front left side of Transmission assembly.
For the CLUTCH INTERLOCK SWITCH its located in the cab mounted to the clutch/brake support as i mentioned earlier.[/IMG]

 

best of luck my friend and if you need to know how to diagnose code 67 dont hesitate to post i'll tell you how ford did it step by step.

 

You have been a great help Dort. And I know you spent a lot of time making all those photos and posting them. They were a life saver tracing the wiring issues. All should be back original as soon as I figure out how to adjust that blasted rod so it will press the switch telling the computer that the clutch is on the floor. As I said earlier I had to go to a wrecking yard to find one and just sticking it in there it is not pushing the switch. I know that it slides but how you unclip it to re-position it is still got me. Looks like I need to move it about a half a inch to make it function properly. Oh, Franklin2 thanks for all your input as well as others that have contributed. You all are the greatest!!!

 

here is the procedure as stated in the ford service manual for you to adjust your clutch interlock switch[/IMG]

 

In this version they DID use the 12v starter circuit for a input to the computer. It's hard to tell though how they are using it. I would assume a voltage is supplied by the computer at pin 30, and when the clutch is depressed this voltage floats up to whatever it is(it's just hanging out in the air since it dead ends at the ignition switch and dead ends at the clutch switch because you are pushing in on the clutch) and when the clutch is let go, it completes the circuit to the starter relay. The voltage from pin 30 is not strong enough to activate the relay, but a small current might go through the relay coil and pull the voltage on pin 30 down a little bit, and the computer detects this.

Too much engineering as always by Ford. It must have been an afterthought also. Why did they not locate this circuit in the wiring schematic? They put it in the harness diagram for some reason. I have the other diagram, i don't have the harness diagram.

 

They used pin 46 Signal Return circuit .Ford lumped in the chassis wiring for all F-series trucks all options included and left the techs to figure out which circuit to look for, but for every engine there was a different EEC IV wiring blueprint even for the 6.9L Diesel engine. One would need to super impose the chassis print with the correct EEC IV print to then try to determine how to approach the problem, hence all EEC IV Faults will lead to only one solution as you progress down the recommended testing steps.REPLACE PROCESSOR. Thats why nothing ever got fixed the way it should have been alot of the time. There's wires on my 86 F-150 that aren't even listed anywhere in terms of color coding, leading me to believe that there were many many engineering changes. This I know because I work at ford and they will use old stock near the beginning of a new product run especially if the engines where similar, and i'm the original owner of my truck and its all original.I remember working on these engines in Windsor Engine Plant 1 where we made the 351W and 351 Modified and the 351 Marine engines before they closed it in 1996.The 302 was made next door at Windsor Engine Plant 2, and our blocks where poured next door to those Plants at Windsor Casting Plant.

 

I'll tell you how the pcm picks up the neutral switch(Pin)30 leading to a code 67
The EEC IV PCM measures the resistance between pin 30 and pin 46 (SIGNAL RETURN)
if the pcm sees the resistance as greater than 5 OHMS it will set code 67 showing that 1 or more switches in the neutral circuit are open. In this case you would simply replace the switch. now things get complicated if the OHM value is less than 5 OHMS at both switches You would need to install a breakout box then check with the key in the on position engine off with your DVOM set to 20 volt scale, measure voltage between test pin 10 (A/C CLUTCH CIRCUIT) at the breakout box and chassis ground. If voltage is less than 1 volt REPLACE PROCESSOR then rerun quick test, but if the voltage is greater than 1 volt it means that there's a short in the (A/C) CLUTCH CIRCUIT service the short then rerun quick test.Now thats strange to understand but it is straight out of the Volume H FORD SERVICE MANUAL ENGINE AND EMISSION AND DIAGNOSTICS

 

I hate Ford diagnostics. You always have to translate what they are telling you in their dumb flow chart style troubleshooting method. That's why I always liked the 3rd party books on the Ford fuel injection. They actually explain what's going on. Ford never tells you anything, just follow their troubleshooting procedure and you will be ok(right).

Like in the above example, you said the computer checks the resistance. That's what you are lead to believe, but the computer has to send out a voltage to run through this circuit to make it work. The second part you printed references pin 10, which according to the schematics has nothing to do with the pin 30 circuit correct?

That's another thing I have heard and noticed. Ford is known to have a lot of typos in their manuals. Sorry to knock your employer so much. Reading this you would think I am a Ford hater, but I am not. I just get aggravated sometimes with the so called "educated" people in the world.

 

LOL Franklin you hit the nail dead on the head, I said that for years. They make no sense only dollars, we've told Ford they just don't listen or they just don't care one way or the other, PFFT!!! REPLACE PROCESSOR:/ , there's always a work around.it's usually found here in the truck forums and from all of us who love our trucks, our hobbies, and that is something you and me can both be thankful for. As for me I just build them and try to offer help when I can.Look at the above post at step FA 10, I shake my head poor us.LOL