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Old 02-13-2014, 07:59 PM
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Speedometer / ABS trouble

The speedometer doesn't work in my '97 F350. It has an ABS light, and won't count miles.

So far I have checked all the fuses, gave the wiring a quick inspection (looked fine), and replaced the speed sensor on the rear axle (took the old one out to clean, ended up breaking it in the process).

Speedometer still doesn't work, it is not counting miles, ABS light is on, and of course no cruise control. I don't have any engine codes, or at least any that show up with my scanner. Anyone know where to try next? Are there any common trouble spots in the wiring? Is my ABS module toast? Is there a way to test the ABS module? Do I need a new cluster?

I had the exact same problem in my old Ford Ranger, ended up being a corroded connector under the drivers side seat that is a common problem with those trucks, anything like that on these?
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Old 02-13-2014, 08:43 PM
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But it still displays the odometer number, just without changing? That suggests the PSOM (in the cluster) is _probably_ good, and the problem is "upstream" - wiring from the VSS to the PSOM, VSS itself (again), or the tone ring in the diff. Is it possible you don't have the VSS seated all the way? I'd look real close at the VSS connector. Beyond that, you may be looking at draining the diff and pulling the cover to inspect the tone ring.

It's unlikely to be the RABS module, because that wouldn't affect the speedo.
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Old 02-14-2014, 04:07 AM
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Yes, odometer still displays miles, they just don't change. The sensor is definitely seated all the way, I am sure of that.

I felt in the rear diff with my finger and the tone ring was at least there, though I didn't spin the wheel and feel the whole thing.

I'm guessing it is in the wiring, just wondering if there is a typical trouble spot on these trucks like there is on the Rangers. Is there any way to test the wiring with a multimeter at the back plug?
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Old 02-14-2014, 05:47 AM
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You'd have to do a continuity test of each of the two wires all the way up to the PSOM. Send me a PM reminder and I'll scan and post the diagram tonight.
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Old 02-22-2014, 09:25 PM
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Ended up getting around to fixing the issue today. After fooling around testing everything with a multimeter I determined there was a broken wire somewhere. Ended up finding the wiring corroded off near the rear axle, inside the factory protective sheath even. It was a huge pain to find and took most of the day, but I finally have a speedometer, cruise control, and no dash lights on.
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Old 02-22-2014, 09:56 PM
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well done getting it fixed
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