is there a thread for the proper procedure/ what ohm readings am I looking for to make sure my harness is fine?

 

Ill look when I get home. On my phone at the moment

 

Does your speedometer jump? Usually when the PSOM goes that's the first clue.
If you end up with another cluster that's from a different year truck, you will want to disassemble the cluster and swap just the speedometer from the good cluster into yours. There are minor differences in wiring between the years that will cause random lights to turn on if you swap the full cluster. I think 94-95 are the same and 96-97 are the same for the PSD, but don't quote me on that.

 

Have you popped the rear diff cover to inspect the tone ring on the main gear for missing teeth? That's where the vss gets it signal from..

 

^^^^^ Or crud built up on or between the teeth.

 

yes my speedo moves 5km/h no matter what i am at and anything over 60mph it moves VERY wonky like 30-40km/h shifts

the wrecker here has a 95 F250 not sure if its gas or diesel, can I steal the PSOM from it?

No but i could maybe do that this weekend.

 

Yep, just swap it into your existing cluster. There's a certain way to disassemble the gauges from the cluster... I can't remember exactly the order now.

 

well i was at the wrecking yard yesterday to get a rearview mirror soi grabbed a speedo as well, only $13

swapped that in and took it for a drive, seemed to run smooth, then later tonight i run to grab pizza and boom the rough shift from 2-3rd is back again.

i never got it up to anything over 80km/h so i dont know if i still got a wavering needle

i still have the knockoff VSS sensor in the pumpkin, maybe i should put the ford back in?

i guess i may need to get it scanned, if its another problem at-least ill know and only be out the $13 for the PSOM

i sure wish i could scan this myself, what a PITA!

 

WOW! glad I was reading some threads on here and a guy mentioned that you can use the diablo and SCT diesel tuners to read those codes.

I have a SCT X3 for my 2009 Mustang GT and I thought what the heck I will give it a shot.

sure enough had 2 DTC codes

0500- Vehicle Speed Sensor Malfunction
0236- Turbocharger Boost Sensor A Circuit Range/Performance


so would this indicate I have a broken wire somewhere between pcm and VSS sensor in rear?

also the 0236 code about the turbo is that anything to worry about?

Thanks.
Dustin

 

Don't worry about the 236 if your truck boosts ok, its a map code, here is a little info on that. Make sure the hose isn't clogged or cracked.
TSB 94-23-15 - 1994-1997 Power Stroke FAQ

I'd change the speed sensor back to a ford one first with the other code.

 

changed back to ford VSS sensor, also did a quick check over on wiring, cant see any issues.

pulled up the data logging on my SCT x3 and my VSS shows consistent values from when i stop to up to 70-80km i get a reading of around 30-40 and it stays consistent if i hold the throttle there,

i am hoping that code was there from before i changed the PSOM still.

took it for a quick drive and retested, got the p1111 passed test code.

so far so good, but I haven't had it out on the highway up to 100km/h yet.

 

Sorry for not replying back. Was thinking right the other day. There should be resistance of some sort in the wires. That would tell if there is an open wire. But since it will read fine up to a certain speed I doubt the wiring is an issue.

 

well was just fixing my door pins tonight(so dome light comes on) and then i remebered i needed to program the PSOM

i checked and its running a constant of 9.72, when i calculate the tires out that i have on i get a constant of 9.87.

is it worth using a change for a small difference?

i hooked my GPS up tonight so on my way to work tomorrow i can check my speed in reference and see if and how much its out by.

I also cleared all codes so fingers crossed my VSS doesnt come back, i think i am just paranoid about the shifting now because it still feels like its shifting "late" to me, who knows.

If i still get rough shifts, yet throw no codes where do i go from there? transmission shop?

 

Im having the same problem with my 96 F150 4.9L

https://www.ford-trucks.com/forums/1...-gremlins.html

Did replacing your VSS with a ford unit fix all the problems?

 

i actually replaced with a knockoff unit and i ended up having more needle bounce then the ford, then i replaced the PSOM, which fixed shifting then put the old ford unit back in and it got rid of the bounce,

my PSOM was my problem all along.