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1994 Ford F-150 ABS module shorts out

Tiny
DPDERMOTT
  • MEMBER
  • 1994 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 250,000 MILES
I removed/replaced instrument cluster to replace bulbs. I also removed/replaced ABS ECU module to run antenna wire. Now the ABS ECU module shorts out, the trans shifts HARD, and the speedo doesn't work. I put in another ABS module and everything works fine for 1-2 minutes until the replacement module frys. I can not find a wiring diagram in my haynes manual for the ABS module. I can live without abs, but the shifting and instrument cluster I need!
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Saturday, October 30th, 2010 AT 5:25 PM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi dpdermott,

Thank you for the donation.

When the speed sensing circuit fails, the speedometer would not work and that would result in harsh or erratic shifting. Symptom description indicates the work performed had resulted in a short in the wiring circuit and the most likely wire would be the Light Green/Black or Red/Pink wire.

You would have to rework back from where you did repair work and check if any wires are pinched or shorted to body.


https://www.2carpros.com/forum/automotive_pictures/192750_RABSWiring94F150Fig05a_1.jpg



https://www.2carpros.com/forum/automotive_pictures/192750_RABSWiring94F150Fig05b_1.jpg



The image is not very clear here so I have followed up with a pdf file of the schematic to your email.

Let me know if you require anything else.
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Wednesday, March 10th, 2021 AT 12:59 PM

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