speedo and odometer not working
Thread Starter
|
New User
Joined: May 2007
Posts: 5
Likes: 0
speedo and odometer not working
i have a 95 f250 PSD,a couple days ago i noticed it was shifting very hard(AUTO) then i noticed speedo and odometer not working also overdrive light on shifter **** was blinking.checked fuses they were fine.was told it could be a sensor??????
also every blue moon its been stalling without warning but starts up right away
was told cps sensor was the problem. could these problems be connected ???
if not odd sensors going at same time ???? THANKS in advance
also every blue moon its been stalling without warning but starts up right away
was told cps sensor was the problem. could these problems be connected ???
if not odd sensors going at same time ???? THANKS in advance
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Check your RABS (Rear antilock brake sensor) on the top of rear differential, sometimes called VSS (Vehicle speed sensor). Look at the connector pins and sockets for corrosion, bend pins ect. The sensor is likely bad, check wiring first.
Posting Guru
Joined: Dec 2005
Posts: 1,034
Likes: 0
Originally Posted by weezll
also every blue moon its been stalling without warning but starts up right away
was told cps sensor was the problem. could these problems be connected ???
was told cps sensor was the problem. could these problems be connected ???
Senior User
Joined: Nov 2003
Posts: 178
Likes: 0
Most of the ones I've seen where the odo and speedo quit working were internal faults in the cluster itself. We had to send them out for repair. Most of the dealers I worked at had loaners to put in while the original got sent out.
The only way to know will be to have a diagnostic done on it. It could be anything from a sensor to the PCM or even the cluster itself. Lots of things are tied into that system.
The only way to know will be to have a diagnostic done on it. It could be anything from a sensor to the PCM or even the cluster itself. Lots of things are tied into that system.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
CHECK ODOMETER DISPLAY
- The trip odometer must be currently displayed for the RESET button to work.
- If unsure about missing or extra segments, perform the odometer display self test as follows:
- Press and hold the reset button on the front of the speedometer while turning the key to RUN.
- Release the RESET button.
- Press and release the select button. The odometer will begin with all zeroes and step through the display test each time the select button is pushed. Refer to PSOM Display Test Sequence below for exact display.
- The first digit on the left does not always match the other digits.
- Key off to exit this test.
- Key off to exit this test.
Trending Topics
Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
Originally Posted by Cuda_jim
Check your RABS (Rear antilock brake sensor) on the top of rear differential, sometimes called VSS (Vehicle speed sensor). Look at the connector pins and sockets for corrosion, bend pins ect. The sensor is likely bad, check wiring first.
I believe the VSS and RABS are two different components. I replaced my VSS. The repair shop replaced my RABS. The RABS, on my rig, is part of the brake system. The VSS is an electronic component.
I don't see how they can be considered the same item.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Cuda_jim,
I believe the VSS and RABS are two different components. I replaced my VSS. The repair shop replaced my RABS. The RABS, on my rig, is part of the brake system. The VSS is an electronic component.
I don't see how they can be considered the same item.
I believe the VSS and RABS are two different components. I replaced my VSS. The repair shop replaced my RABS. The RABS, on my rig, is part of the brake system. The VSS is an electronic component.
I don't see how they can be considered the same item.
This sensor also effects Cruise control because it goes thru the PSOM.
Last edited by Cuda_jim; May 6, 2007 at 05:57 AM.
Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
Well, if you insist.
According to the printed manual that I'm looking at; Page 9-34 shows the VSS located on the top of the differential. They have pictures, too. Then on Page 9-35, to the right of the diagram,
"The valve is located on the frame rail, under the vehicle on the driver's side on the 1997-98 F-250HD, F-350 and F-Super Duty. The valve is located in the brake lines, below the master cylinder.
View G, of Figure 113 shows the location of the Rear anti-lock braking system valve, in the frame rail, not on the rear differential. Perhaps we're talking about two different components.
When my RABS unit was replaced, the technician showed me the until and why it was failling.
According to the printed manual that I'm looking at; Page 9-34 shows the VSS located on the top of the differential. They have pictures, too. Then on Page 9-35, to the right of the diagram,
"The valve is located on the frame rail, under the vehicle on the driver's side on the 1997-98 F-250HD, F-350 and F-Super Duty. The valve is located in the brake lines, below the master cylinder.
View G, of Figure 113 shows the location of the Rear anti-lock braking system valve, in the frame rail, not on the rear differential. Perhaps we're talking about two different components.
When my RABS unit was replaced, the technician showed me the until and why it was failling.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
We/you are talking about 2 different components. You had the valve replaced, not the sensor.
Some call the RABS a VSS, our trucks officially don't have a VSS. But it still operates the speedometer. Go to the auto part store and order a VSS and you will get somthing like the picture below.
In the electrical schematic above it shows the RABS (Rear Antilock Brake SENSOR) supplying a signal to the both the PSOM (Programable SPEEDOMETER-ODOMETER Module) and the Rear Antilock Brake Module.
The PSOM supplies a signal to the speedometer/odometer.
The RABS Module supplies a signal to the RABS Valve assembly. The valve you replaced.
Both the PSOM and the RABS Module are located in the dash.
Some call the RABS a VSS, our trucks officially don't have a VSS. But it still operates the speedometer. Go to the auto part store and order a VSS and you will get somthing like the picture below.
In the electrical schematic above it shows the RABS (Rear Antilock Brake SENSOR) supplying a signal to the both the PSOM (Programable SPEEDOMETER-ODOMETER Module) and the Rear Antilock Brake Module.
The PSOM supplies a signal to the speedometer/odometer.
The RABS Module supplies a signal to the RABS Valve assembly. The valve you replaced.
Both the PSOM and the RABS Module are located in the dash.
Thread Starter
|
New User
Joined: May 2007
Posts: 5
Likes: 0
hey thanks for all the info guys
i replaced the vss and stil didn't work re-checked fuses and it was popped
put in a new one and speedo worked again .next day i washed my truck when i went to drive it speedo was gone again.so i replaced fuse and presto its woking fine (3days) must be ashort somewhere????? triggered by washing it NO MORE CAR WASHS
i replaced the vss and stil didn't work re-checked fuses and it was popped
put in a new one and speedo worked again .next day i washed my truck when i went to drive it speedo was gone again.so i replaced fuse and presto its woking fine (3days) must be ashort somewhere????? triggered by washing it NO MORE CAR WASHS
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Craig, The VSS I posted won't fit our trucks. The point I was making, "If you ask for a VSS for our trucks, You will get the wrong part." Our trucks don't have a VSS, they have a RABS only, that pulls double duty.
I just steal the picts off the 'net. The technical picts are from my Ford Service manuals on DVD. I have all from 96 to 08. See the link in my sig.
I just steal the picts off the 'net. The technical picts are from my Ford Service manuals on DVD. I have all from 96 to 08. See the link in my sig.