Yep.
VSS, Cruise control and OD light...
- Thread starter saburai
- Start date
Yep.
Yep. Hard, soft, fast slow...
My point being, the speedometer gets its signal from the VSS. The speedometer is functional, and hasn't really changed much other than not being as smooth with the BWD sensor. So yes, my assumption is coincidence. I wouldn't have been surprised if the VSS had been the problem, but evidence appears contrary to that conclusion.
I hate electrical gremlins!
I will second this if you haven't disconnected it yet, I remember you bypassing the valve but don't know if you touched the controller wiring in the cab. I remember reading something about this elsewhere. I don't really understand why it would affect it, but it's easy enough to try.
Somehow I missed this! Thanks, I'll give it a shot in the morning.
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Is the black box at the front of the picture abs box? Just unplug it? Let the connector hang?
Did it, did it, and did it. No change...
Progress. 
Wait. No change in what?
I didn't think that module would affect the cruise control.
What I said was that unplugging that module got rid of the fluttering speedo needle, for me.
Wait. No change in what?
I didn't think that module would affect the cruise control.
What I said was that unplugging that module got rid of the fluttering speedo needle, for me.
The speedometer fluttered slightly with the original. When I installed the BWD VSS the cruise control worked for a bit, but the fluctuation increase markedly. Then, when I installed the Motorcraft VSS, the cruise control was not functional but the flutter was back to where it has been since I bought the truck - very slightly and only at highway speeds, not much, you've got to look for it.
So what to check? Can I put a meter and get information of value by checking the resistance the VSS? The PSOM? The servo?
Did you run through the troubleshooting checklist already? I can dig around for it if you still need it. I thought I posted it for you once, but I don't remember now.
EDIT: I found it, https://www.oilburners.net/threads/electronic-cruise-control-diagnosis.13161/
EDIT: I found it, https://www.oilburners.net/threads/electronic-cruise-control-diagnosis.13161/
GreggH
Registered User
Definitely interested in what you figure out. I had the OD light flashing and speedo jumping. I didn’t know better and ended up blowing the front seal out of the freshly rebuild trans so Pulled it out again and had it rebuild (rechecked) again. Then started tracking down the problem. Replaced the wiring connector going into the trans control module (I believe) because the lock clip was broke off and trans guy thought it might be sliding up and partially unplugging causing the problem. that didn’t fix it. Replaced the speed sensor and FIPL sensor, still didn’t fix it. Trans guy recommended possibly the speedometer jumping causing trans to shuttle shift back and forth, so switched that out on the cluster. Still didn’t fix it. I eventually ended up finding a wire in the speed sensor harness about midway between the axle and frame that was had about 2 strands of wire keeping it connected. I fixed that and it took care of the OD light, but still have the bouncing speedo.
yes it is an O’reilly’s bought speed sensor so might eventually try an OEM one to see if that works after reading this about aftermarket ones causing the bouncing.
my cruise doesn’t work either. Not sure if it’s necessarily related though
yes it is an O’reilly’s bought speed sensor so might eventually try an OEM one to see if that works after reading this about aftermarket ones causing the bouncing.
my cruise doesn’t work either. Not sure if it’s necessarily related though
Did you try did you try unplugging ABS box behind the glove compartment?
