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Old 10-15-2012, 07:04 PM   #1
musclegto
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swapped my psom.... nothin

well, since I bought the truck about a month ago. In attempts to fix my hard shifting I swapped the VSS. Since then the ABS light has been on, leading me to believe the original sensor was good and this new autozone was bad from factory.

I pulled codes, got nothing, so then I figured it had to be the PSOM. Picked one up this weekend from 95 that was being parted out. Got the whole gauge cluster and looked in good condition. Swapped the speedo, fired her up and.... nothing.

Speedo still does not work, still shifts hard. What is more likely, that the donor PSOM was also bad? or that my problem is not in the PSOM but somewhere else? I ordered a VSS from FORD to get rid of the ABS light.
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Old 10-15-2012, 07:07 PM   #2
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I'm betting that your ABS module took a dump. There is a way to bypass it. And You should do this anyways just to rule this out. There is a link........I'll have to find it. I've done mine as my module went bad and speedo went south.
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Old 10-15-2012, 07:09 PM   #3
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Here's the link.
http://www.fullsizebronco.com/forum/...d.php?t=141328
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Old 10-15-2012, 08:00 PM   #4
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I will go ahead and try it, hopefully thats it.
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Old 10-15-2012, 08:03 PM   #5
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I'm betting that your ABS module took a dump. There is a way to bypass it. And You should do this anyways just to rule this out. There is a link........I'll have to find it. I've done mine as my module went bad and speedo went south.
X2

Happened to me too. Easy to bypass.
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Old 10-15-2012, 09:18 PM   #6
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Why would the ABS make the tranny shift hard.

What shifts are hard.
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Old 10-15-2012, 09:26 PM   #7
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All of them, even reverse. But 1st to 2nd is the worse one.
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Old 10-15-2012, 09:50 PM   #8
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Why would the ABS make the tranny shift hard.

What shifts are hard.
When the abs computer burns it cuts the vss square wave off from the Psom. The Psom sends the readjusted signal to the trans telling it when to shift. That why you should reprogram the Psom with a tire change.


Vss signal basically travels like so


Vss====>abs computer=====>psom======>trans.
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Old 10-15-2012, 09:58 PM   #9
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If you still have issues it is possible it's the tone ring inside the Diff. Rule other things out first though.

An E4OD goes into limp mode when it does not get a signal from the VSS. It's the same sensor that tells the ABS if the rear wheels are locked up. Ergo, if the ABS light is on and the transmission is in limp mode, it's a good indicator that there is a problem with the VSS.
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Old 10-15-2012, 10:04 PM   #10
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If you still have issues it is possible it's the tone ring inside the Diff. Rule other things out first though.

An E4OD goes into limp mode when it does not get a signal from the VSS. It's the same sensor that tells the ABS if the rear wheels are locked up. Ergo, if the ABS light is on and the transmission is in limp mode, it's a good indicator that there is a problem with the VSS.
Or the wires. A broken wire will do the same thing. If the tone ring is messed up then you should hear it bc you would has other probelms INSIDE the axle.
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Old 10-15-2012, 11:20 PM   #11
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Or the wires. A broken wire will do the same thing. If the tone ring is messed up then you should hear it bc you would has other probelms INSIDE the axle.
Agreed.....

Plus the Speedo should still move. It may bounce horribly, but should still move. ABS module gone bad equals no Speedo at all.
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Old 10-15-2012, 11:40 PM   #12
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jumped the abs module, bingo, speedometer works. Now I it seems like the problems is finding a new one.
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Old 10-15-2012, 11:41 PM   #13
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this wouldn't be it, would it?

http://www.amazon.com/A1-Cardone-12-...nco+abs+module
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Old 10-15-2012, 11:42 PM   #14
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Do AcDElco or Motorcraft make them?
Not that I know of. eBay or try a junk yard computer. I did that and it worked.
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Old 10-29-2012, 09:58 PM   #15
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have been looking for one for weeks to no avail? Has anyone seen one around?
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Old 10-30-2012, 03:40 AM   #16
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Why did you start a new thread?
http://fullsizebronco.com/forum/showthread.php?t=214680

Read this caption, then keep going to the NEXT until you've read everything about 4WABS:

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Old 10-30-2012, 06:00 PM   #17
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have been looking for one for weeks to no avail? Has anyone seen one around?
If your asking to buy parts in the open threads the thread will be deleted.


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Why did you start a new thread?
Other thread has been deleted.
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Old 10-31-2012, 09:43 PM   #18
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Why did you start a new thread?
http://fullsizebronco.com/forum/showthread.php?t=214680

Read this caption, then keep going to the NEXT until you've read everything about 4WABS:

I read the caption as i do with all your links, now i need to find one. :)
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Old 11-01-2012, 09:47 AM   #19
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yo, I had problems finding one from yards here; 2 were bad.

Raybestos is selling; "Abs Computer Module"
Remanufactured part
http://www.raybestos.com
Select Catalog and go through the drill for the part #; then do a Google


do not order; contact Rock Auto and ask if available because Raybestos may have ceased reman on these units (again)
http://www.rockauto.com

try;
BBA-reman - Bronco/Ford truck remanufactured ABS, ECUs, throttle bodies, air mass meters catalytic converters, etc
call toll free at 1-866-573-2740

Confirm with e mail; be sure to cite Year, Make, Model, etc
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Old 11-19-2012, 02:34 AM   #20
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I have exhausted my sources and have not found one. Hopefully I can found one in a junkyard soon.
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