psom i think?
Thread Starter
|
New User
Joined: Jun 2014
Posts: 6
Likes: 0
psom i think?
Not sure how to determine if the VSS or the PSOM is bad. 95 f150 4WD. I have no speedo/odo and i tried a new vss or dss/abs, that didn't do anything. I also tried to re-sadder the psom, that didnt work. so now it still shifts hard and no speedo/odo.
grr.
grr.
Postmaster
Joined: Nov 2011
Posts: 3,533
Likes: 17
From: SW Florida
Welcome to FTE!
What do you mean by no speedo/odo? Does the odo display show anything at all or is it completely dead? If it's blank, you probably have a fuse blown.
If it shows mileage that never increases, then the quick way to test for VSS signal is pull the cluster out and get the rear axle off the ground. Make sure the truck is in 2WD and let it idle in gear while you use a meter to see if you got a VSS signal coming into the PSOM.
What do you mean by no speedo/odo? Does the odo display show anything at all or is it completely dead? If it's blank, you probably have a fuse blown.
If it shows mileage that never increases, then the quick way to test for VSS signal is pull the cluster out and get the rear axle off the ground. Make sure the truck is in 2WD and let it idle in gear while you use a meter to see if you got a VSS signal coming into the PSOM.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
If it shows mileage that never increases, then the quick way to test for VSS signal is pull the cluster out and get the rear axle off the ground. Make sure the truck is in 2WD and let it idle in gear while you use a meter to see if you got a VSS signal coming into the PSOM.
But first check fuse #8 and #18.
What do you mean by "I also tried to re-sadder the psom"?
Check it here at the RABS plug:
/
Thread Starter
|
New User
Joined: Jun 2014
Posts: 6
Likes: 0
psom/vss i think
I will give that a shot. oddly enough the d/s door was sprung and the fender was also dented in. I did check the fuses, but I will check them again
Thread Starter
|
New User
Joined: Jun 2014
Posts: 6
Likes: 0
psom/vss i think
[QUOTE=dixie460;14470166]Welcome to FTE!
What do you mean by no speedo/odo? Does the odo display show anything at all or is it completely dead? If it's blank, you probably have a fuse blown.
If it shows mileage that never increases, then the quick way to test for VSS signal is pull the cluster out and get the rear axle off the ground. Make sure the truck is in 2WD and let it idle in gear while you use a meter to see if you got a VSS signal coming into the PSOM.[/QUOT Happy 4th of July, guess what I'll be doing today👍The odometer display is blank and ABS light is also flashing.😕
What do you mean by no speedo/odo? Does the odo display show anything at all or is it completely dead? If it's blank, you probably have a fuse blown.
If it shows mileage that never increases, then the quick way to test for VSS signal is pull the cluster out and get the rear axle off the ground. Make sure the truck is in 2WD and let it idle in gear while you use a meter to see if you got a VSS signal coming into the PSOM.[/QUOT Happy 4th of July, guess what I'll be doing today👍The odometer display is blank and ABS light is also flashing.😕
Trending Topics
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Nothing is common between the RABS module and the PSOM.
Even the grounds are on opposite sides of the truck kick panels.
They are feed by a common signal from the rear VSS but that would not make the Odometer go blank.
It is possible that the PSOM is dragging the signal from the VSS down and making the RABS lamp flash.
Even the grounds are on opposite sides of the truck kick panels.
They are feed by a common signal from the rear VSS but that would not make the Odometer go blank.
It is possible that the PSOM is dragging the signal from the VSS down and making the RABS lamp flash.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Thread Starter
|
New User
Joined: Jun 2014
Posts: 6
Likes: 0
psom/vss i think
I apologize, I mistakenly wrote ABS was flashing when I meant that the overdrive light was flashing. Thanks for getting back to me so quickly!
"the more we sweat in peace time, the less we bleed in war time".
"the more we sweat in peace time, the less we bleed in war time".
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
The overdrive light flashing is normal when you have no information coming from the PSOM to the Computer.
You say you tried another PSOM, did you check to see if you have power and ground to it with the key on?
Also you said that the truck was hit on the drivers side. That is where the wires run from the PSOM to the Speed Control and then on to the computer. If the Gray wire with a Black stripe is shorted to ground you may be burning up the PSOM's as soon as you put the PSOM in and turn on the key.
You need to check and see if these wires are grounded.
The signal train going from the PSOM to the Computer:
/
You say you tried another PSOM, did you check to see if you have power and ground to it with the key on?
Also you said that the truck was hit on the drivers side. That is where the wires run from the PSOM to the Speed Control and then on to the computer. If the Gray wire with a Black stripe is shorted to ground you may be burning up the PSOM's as soon as you put the PSOM in and turn on the key.
You need to check and see if these wires are grounded.
The signal train going from the PSOM to the Computer:
/
Thread
Thread Starter
Forum
Replies
Last Post
thordehr
1999 - 2003 7.3L Power Stroke Diesel
19
Nov 22, 2010 11:09 PM