Speedometer/odometer
Logistics Pro
Joined: Jul 2003
Posts: 3,595
Likes: 52
From: Lawton, Oklahoma
Speedometer/odometer
I wasted a couple hours once checking every possible way for one that was boucing all over. Road tested with NGS monitoring VSS. VSS signal dancing everywhere. Replaced speed sensor. Still bounced, and VSS signal still fluctuating. Pulled the rear cover on the diff and checked all the teeth on the tone ring. Checked all the wiring back to front.
On the models prior to 97, the PSOM controls the signal to the speed control and speedometer and VSS monitor reading comes from PSOM.The only real way to test the VSS is with a multimeter it seems, if the cluster PSOM is bad. Replacing the cluster fixed it all up. That doesnt mean that you cant have something else screwed up, but the symtoms sure look like cluster to me.
On the models prior to 97, the PSOM controls the signal to the speed control and speedometer and VSS monitor reading comes from PSOM.The only real way to test the VSS is with a multimeter it seems, if the cluster PSOM is bad. Replacing the cluster fixed it all up. That doesnt mean that you cant have something else screwed up, but the symtoms sure look like cluster to me.
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Speedometer/odometer
Homer
On a '95, the PSOM is totally independent of the rest of the cluster, and it's easy to pop it out & mess with it. Also, the sensor in the rear axle is technically called the "ABS sensor"; not the "VSS", which is used on older & newer vehicles but not '92-96 trucks.
Blue
Your problem still has to be in the PSOM head because pressing the buttons affects it. You don't have to pull the diff cover to get to the sensor - it slips out the top. And you can shine a light into the hole and spin one rear wheel to check the tone ring. The teeth should all look the same, and they shouldn't move side-to-side as the diff turns. But I'm sure that's not the problem.
On a '95, the PSOM is totally independent of the rest of the cluster, and it's easy to pop it out & mess with it. Also, the sensor in the rear axle is technically called the "ABS sensor"; not the "VSS", which is used on older & newer vehicles but not '92-96 trucks.
Blue
Your problem still has to be in the PSOM head because pressing the buttons affects it. You don't have to pull the diff cover to get to the sensor - it slips out the top. And you can shine a light into the hole and spin one rear wheel to check the tone ring. The teeth should all look the same, and they shouldn't move side-to-side as the diff turns. But I'm sure that's not the problem.
Logistics Pro
Joined: Jul 2003
Posts: 3,595
Likes: 52
From: Lawton, Oklahoma
Speedometer/odometer
Thanks, Ill remember that if I ever get the opportunity to play with PSOM, but at the dealer level, we only have the cluster replacement option for warranty purposes. (unless the parts boys are lieing to us... that never happens does it?.. 
)
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Last edited by HomerWinzlow; Aug 23, 2003 at 04:58 PM.
More Turbo
Joined: Apr 2003
Posts: 729
Likes: 0
Speedometer/odometer
Ok OK, Ill admit it, I still am confused what the psom is. Is it the speedo that I look at when I drive, is it the whole cluster, or is it somthing that can be replaced with out messing up the odometer. That is the what I realy want to know. How can i get this fixed and still have the same odometer reading. Sorry for my ignorence. This stuff is all new to me. Ilike my 66 mustang, its simple!!
Thread Starter
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New User
Joined: Jul 2003
Posts: 14
Likes: 0
From: IL
Speedometer/odometer
Hey guys I got a cluster from a salvage yard for $70 and the mileage was within 1000, lucky me huh. If you call several different salvage yards I bet you can find one close tp your own.
Thanks for all the advice and I reaaly think this website is a terrific place to learn about the little gremlins in these cars
Thanks for all the advice and I reaaly think this website is a terrific place to learn about the little gremlins in these cars
New User
Joined: Jan 2005
Posts: 1
Likes: 0
Hey guys I have a 1988 Ford F250 and I need to know how to install a new speedometer cable any help is greatly appreciated. Also, I am selling a 2000 Ford Ranger with 47,000 miles 3.0L v-6 5 spd. for $10,500. I'm from Piedmont, West Virginia 304-355-2002
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