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abs light came on

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Old Jan 20, 2010 | 08:05 PM
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abs light came on

After changing the rear i my 94 4.0, the abs light came on, Tried changing sensor on top of rear diff with the one that was in the origional rear. Light still on. Before I go buy a new sensor, is there anything else that could cause this problem? Also are there any other symptoms of that sensor being faulty. Can it play tricks with the proportional valve? My rear tires would lock up if I hit the brakes hard.
 
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Old Jan 21, 2010 | 09:28 AM
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Is the replacement differential gear ratio the same as the OEM one????
 
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Old Jan 21, 2010 | 03:14 PM
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no, the old diff was a 3.27 non limited slip and the new diff is a 3.73 limited slip
 
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Old Jan 21, 2010 | 03:27 PM
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Well maybe the ABS computer will have to be reprogrammed, as it's now getting conflicting info!!!!
 
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Old Jan 21, 2010 | 07:57 PM
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Could I change out the computer with the one from the donor truck and if so where is it located?
 
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Old Jan 21, 2010 | 08:21 PM
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Well we don't know anything about how the two vehicles are equipped, like the diffrences in engines transmissions, brake systems, vehicle year/model, ect, ect, so there isn't any way right now to know just what you have & if a ABS computer swap would work.

Even then I'm not sure, as I'm not an ABS computer guru, but I'll bet someone reading this thread knows the answer.

Seems to me a Ford Dealer, or brake shop with the proper computer, could reprogram it without much trouble & that would likely be much easier to do.
 
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Old Jan 21, 2010 | 09:16 PM
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Thanks Pawpaw, I have a 94 5sp 4.0 and the donor truck is the same except it is an extended cab
 
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Old Jan 21, 2010 | 09:40 PM
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Well do both vehicles have 4 wheel ABS, or both just have rear ABS????

I take it that the 94 is a regular cab & the donor is an extended cab?????

The reason I ask is that the ABS computer calibration may be different for the two, as one vehicle is heavier than the other.

All kinds of things to consider when we begin to mix things up.

Maybe a Ford ABS brake guru will chime in & enlighten us!!!!
 
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Old Jan 21, 2010 | 09:59 PM
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I have no idea if they are 4 wheel abs or rear wheel abs How would I tell. Will it say on the door sticker? There are no sensors on the rear hubs. Only the one on top of rear diff that I know of.
 
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Old Jan 21, 2010 | 10:00 PM
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P.S. where is the abs module?
 
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Old Jan 21, 2010 | 10:28 PM
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I'm not sure where the ABS computer is on the 94. Probably in the cab on the drivers side under the dash, or maybe behind the kick panel.

Raise the hood & look down on the drivers side inner fender below & in front of the the brake master cylinder, to find the ABS motor & valving.

If it has 4 lines coming out, two going aft & two going foward to the front wheels, it'll be four wheel ABS.
Two lines coming out & going aft, it's a rear wheel only ABS system.

If the vehicles have different ABS systems, the ABS computer, or it's programming is likley to be different.
 
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Old Jan 22, 2010 | 03:04 PM
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thanks again pawpaw. ill check it out.
 
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Old Jan 23, 2010 | 05:14 PM
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abs light update

took off rear brakes today to check something else. noticed the pads looked like they were wearing funny and felt kinda soft. decided to change pads. during change i noticed on driver side, previous owner had the pads reversed(had the e-brake arm on the small pad). put everything back together the right way with new pads and took it for a little drive and the abs light is out. will drive more and hope the problem is solved. thanks for all the replies.
 
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