06 F-350 ABS light on, out of ideas - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 6 (permalink) Old 09-19-2019, 11:52 PM Thread Starter
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06 F-350 ABS light on, out of ideas

Hi, I've replaced all three ABS sensors and my speedo registers the correct mph and doesn't bounce etc. The ABS light is on solidly. Every now and then (maybe once a month), the ABS will kick in, rattle the brake pedal, and the light will go off. Then later on it will come back on. Fuse 11 is fine too.
I have a vanilla OBD scanner which didn't seem to give any codes. I want to verify the circuits from the sensors back up to the ABS unit in front of the fuse box and need help with which pins on that gigantic connector are for the sensors - could someone share which ones to check?

Are there any other components of the ABS apart from the module itself in the engine bay, and the three sensors? Anything else I can check?

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post #2 of 6 (permalink) Old 09-20-2019, 12:46 AM
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Re: 06 F-350 ABS light on, out of ideas

3rd brake light on back of cab is burnt out. I bet your cruise control dont work either.

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post #3 of 6 (permalink) Old 09-20-2019, 01:21 AM
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You need to have it scanned with the proper tool. You’re just wasting time and money doing what you’re doing now.
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post #4 of 6 (permalink) Old 09-20-2019, 10:54 AM Thread Starter
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Re: 06 F-350 ABS light on, out of ideas

All brake lights are working, checked then last night before posting but forgot to add that in my note. Found a youtube that described what the "ABS light goes off, then comes on solidly after start" symptom meant, which to him was the ABS module is unable to communicate with one or more of the sensors. So I'll need to check the wiring between the module and the sensors. I suspect the right side because the connector was hanging loose instead of being attached to the fender liner. Would anyone happen to know the pinouts for the big connector into the ABS module?
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post #5 of 6 (permalink) Old 09-22-2019, 11:58 PM Thread Starter
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Re: 06 F-350 ABS light on, out of ideas

Identified the problem after watching a youtube where the guy explained that if the ABS comes back on again after doing the initial self-test, then it indicates a failure to communicate with one of the sensors. The pink wire into the connector that attaches to the rear diff ABS sensor had broken but it was hard to see until bending the wire right around at which point the plastic gave way and the clearly corroded wire was already separated. Have a new Ford 5C3Z-14S411-AA replacement connector / pigtail coming just in time for the State inspection : )
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post #6 of 6 (permalink) Old 09-23-2019, 12:49 AM
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Re: 06 F-350 ABS light on, out of ideas

Thanks for posting the repair !

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