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1995 RABS mystery


ratdude747

Member
Supporting Member
Article Contributor
TRS 20th Anniversary
Joined
Aug 10, 2014
Messages
503
Reaction score
22
Points
18
Age
31
Location
Madison, IN
Vehicle Year
1995
Make / Model
Ford Ranger
Engine Type
4.0 V6
Engine Size
4.0L
Transmission
Automatic
2WD / 4WD
2WD
Tire Size
215/70R15
This is an issue that has been plagued me for over year, ever since I bought the truck in August of 2014. My ABS doesn't work. I'll give a rundown of what I did and what happened as a result.

  • When I bought the truck it had an intermittent ABS light. It eventually became a constant light. Around January 2015 I pulled the ABS code, code 12. I went through the circuitry and found the issue to be with the ABS computer itself, and upon opening the module, the I/O pin on the MCU chip. I went to pull-a-part for a fresh module...
  • The new module still returned an ABS light, which gave the "working fine" code. I bought an NOS controller on ebay, which did the same. I then found out I had no light to begin with, as the LEDs in my Dash didn't agree with the ABS module's current-modulated lamp driver. Swapping the ABS light to a bulb resulted in both computers returning no ABS light.
  • However, my ABS still didn't engage. I next went after the speed sensor, as they're cheap and easy (sorta) to replace. I made the swap and the old one tested good, but only barely so. Still no RABS function.
  • Next, I tackled the RABS valve. I did get an ABS valve code for a short bit, so that was my initial rationale for going that direction. Once again, a trip to pull-a-part and I made the swap. The old valve tested good before I swapped, although I suspected the valve was stuck, which a multimeter test woudn't tell me. The new valve didn't fix the issue.


Which brings me to the present state.

The ABS computer works (as the power-on lamp test occurs), and since the valve swap I've gotten no ABS lights. However, if I slam the brakes, all I get are skid marks.

I'm out of ideas... I'd be tempted to say dicky wiring, but I'd figure I'd get some sort of ABS valve code if that were the case. Unless it's just high(er) resistance, which I could see doing this. That said, the wiring looked OK based on a visual inspection.

I do have wiring diagrams, which is how I bench-tested the valves.

Any suggestions here?
 


Broccoli94

New Member
Joined
Apr 15, 2019
Messages
1
Reaction score
0
Points
1
Location
Bally pa
Vehicle Year
1994
Make / Model
Ford/ranger xlt
Transmission
Manual
Where is the computer at for rabs?
 

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