RABS II computer - Ford Powerstroke Diesel Forum
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Old 11-14-2012, 05:15 PM
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RABS II computer

My 95 has a speedometer that keeps jumping around above 50mph, I tried my spare PSOM so that's out. Was going to check the VSS and wire but decided to unplug the RABS first. With the RABS disconnected the PSOM is perfect so I figured I would get a new one. Just put the new one in today but it does the same thing. How common is if for the RABS computer to cause the PSOM to jump around? This is the early RABS II system where the VSS signal is split and runs parallel wires to the PSOM and RABS vs the later system that runs the VSS into the RABS then back out to the PSOM. I just have a hard time believing that the new RABS computer I got has the exact same issue but I am stumped as to what else it could be.
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