Ford: Any REAL experts on here?

Cass opined in "Any REAL experts on here?"
 

Sorry, I've never had the pleasure of owning a MkVIII..

So I wouldnt have the slightest idea.

Thanks, Backyard.

I am not so sure that it is a pleasure. I will make that decision when I
get it running.

I have the service manual and the electrical manual but not the power-train
manual.

One would think it wouldn't take a huge effort to determine the problem in
why the fuel-pump relay is not being energized but it does.

I don't know of any groups to go to other than this one and rec.autos.tech.

Cass


"Backyard Mechanic" <com> wrote in message
news:168.3.44... 

"Cass" <com> wrote in message
news:bjgu57$9m7$alt.net... 
in 
Cass, You may want to share the year with us, this could have EEC4 or 5.
Either way, the relay has power supplied by the battery all the time. The
variable is that ground for the relay is provided by the PCM, which sends
power to the fuel pump. Your EVTM should be enough to troubleshoot this.
Make sure that power comes in where it should, if that's OK, try grounding
the wire to the PCM instead of holding the relay, if this works, trace your
wiring or check your PCM.

Cass wrote: 
i got a 93 taurus and the integrated control module(constant control
relay) did the same thing to the a/c (voltage to the a/c compressor)..
probably got what i have... i got the $65 shop manual and the $32
electrical/vacuum trouble shooting guide, but i like you dont have the
Power control manual which helm want $300 for... the books i have walk
you to the steps to check everything up until the Power control.. that
is where mine stopped also... i got the a/c working dont know how, it
just started working.. i think it was the contacts in the relay for the
a/c i did not take the module apart to find out yet.. next time it stops
working i will.. i have been on various newsgroups/boards with this and
found that some people check the relay by taking it apart and
resoldering wires in it.. probably not your problem as you get no signal
from the Power control module to the relay.. on mine if this is the case
there is another relay(sensor??) that is not operating correctly and
feeding bad info into the Power control module...look for that in the
electrical/vacuum troubleshooting book....

Cass opined in news:bjgv7n$bl5$alt.net:



Well... try this shot in the dark from a non-expert.

With key on,
check for 12v on the red wire/Lt Grn stripe

- This should be there, since the engine runs when you hold relay closed..
this power also sets the PCM relay

then check for grd on Brown wire/white stripe,

this Gnd comes from the "VCRM"
Which is digitally (not individual signal) controlled by the PCM.. meaning
dead end.

Hope it's the relay

Note the Pink/Blk from the PCM is a "sense" wire, not used for control. It
may confuse you if you open the inertia sw as it has a lo-current voltage

If you ran codes, it should tell you about the failure.. which you already
know

Backyard Mechanic opined in news:168.3.44:
 


AS key is turned on! Or with relay held closed, engine running

Backyard,

It isn't the relay as I put 12 volts on it and it pulled in just fine. The
high side of the relay coil is getting 12 volts when the ignition is turned
on. What is ISN'T getting is the ground that should be applied to the other
side of the relay.

I don't know what wires you are talking about when you are calling out their
color.

The inertia switch has nothing to do with this problem as when I push in the
relay, the pump runs. If the inertia switch was open, the car wouldn't run.

What you are saying about the VLCM makes sense as it seems that the data
buss from the PTCM is sending data to the VLCM and telling it what to do
about the pump.

No code is showing on the computer that I built for this task. I didn't
write the software so I am not sure that it even addresses this problem.

Thanks

Cass


"Backyard Mechanic" <com> wrote in message
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meaning 
It 

Pygocelis,

I'm sorry, I thought that I had mentioned the year but see that I did not.

The car is a 1996 Lincoln Mark VIII.

As I mentioned in another post, the relay IS getting 12 volts and if I
ground the other side of the coil, the relay pulls in.
The problem is that the relay is not being grounded and that ground comes
from the VLCM and that unit is told what to do about the fuel pump by the
PTCM. So, I am not sure if the problem is IN the VLCM or the PTCM or
perhaps both.

Thanks

Cass


"Pygoscelis Papua" <com> wrote in message
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the 
push 
your