E4OD blues

[Luda-Chris]

The first VSS was a dorman. So I replaced it with a motorcraft one last week. So I’m thinking it’s working. I also replaced the pigtail bc the wiring looked old. Plenty of room for flex. I’ll add that when it throws this code in reverse it makes a shuddering sound and vibrates pretty good.

 

[trackspeeder]

" Speedo kinda floats in the 50-70 mph range. "

The speedometer itself is throwing "clue bats" all over the place.

If the speedo can't tell you how fast you are going, it likely can't tell the Transmission controller either.

The Transmission controller will do it's best to disengage the mechanicals safely and throw a code as to why.

You got it.

VSS signal goes to the PSOM, speedometer, then to the TCM.

Pre digital days (89-91) the VSS signal went straight to the TCM.

 

[Luda-Chris]

Found this information while looking for a PSOM rebuild. This is exactly what’s going on with my Speedo. 50-70 mph and it’s just a slight wiggle.

So I guess in need to pop off the differential cover and inspect some things?

 

[Nero]

You might get lucky and just pop the sensor back off and rotate the assembly, without removing the cover.

 

[Luda-Chris]

You might get lucky and just pop the sensor back off and rotate the assembly, without removing the cover.

I think the rear is due for a fluid change so I’ll just get messy this next weekend I’m off. I have a sneaking suspicion that the tone ring might have damaged teeth.

 

[steve phillips]

PSOM REPLACEMENT F150 1995 photo series, step by step

1995 F-150 speedometer (psom) replacement

www.harleyhummerclub.org

 

[Luda-Chris]

PSOM REPLACEMENT F150 1995 photo series, step by step

1995 F-150 speedometer (psom) replacement

www.harleyhummerclub.org

update- tone ring was damaged. I replaced it and it fixed the speedo.

However, I still get the OD light coming on when I reverse uphill (my driveway) and cut the wheel to back onto the street. Soon as I put it in drive, the light goes off. gping to replace the MLPS next.