speed censors?
Fleet Owner
Joined: Aug 2005
Posts: 23,668
Likes: 301
From: Easton,Ks
When you start the truck the PSOM reads the mileage from the EEPROM and then it keeps track of the mileage as you drive and sends this to the odometer. When you turn off the key the hot in start power wire to the PSOM drops out and when this happens the PSOM then updates the EEPROM (stores the mileage).
If you lose power to both wires at the same time (hot in start #18 and hot at all times #8) the PSOM will not up date the mileage in the EEPROM and when you start it back up you will have the same mileage that you started with before because the EEPROM was never updated.
Now that you do not have a #8 fuse you no have power for the PSOM to write the mileage back to the EEPROM.
If you lose power to both wires at the same time (hot in start #18 and hot at all times #8) the PSOM will not up date the mileage in the EEPROM and when you start it back up you will have the same mileage that you started with before because the EEPROM was never updated.
Now that you do not have a #8 fuse you no have power for the PSOM to write the mileage back to the EEPROM.
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
And that IS a good way to kill the PSOM too! If the EEPROM gets corrupted its game over for mileage readings. The "Error " or "---------" will show in the ODO window, the worst, you loose your ratio settings and have no speedometer and odometer!
Subford, still figuring out that info too....
Subford, still figuring out that info too....
Thread Starter
|
Freshman User
Joined: Feb 2006
Posts: 40
Likes: 0
From: n.e. ohio
the mechanic had the wire diagrame for the truck, it showed the ONLY thing on the #8 fuse is the air bag module 
if it is bad for the other computer why would he say its not?
I even ask him about putting a sports wheel on to do away with the air bag all together , he said this way is the same thing the air bag is disabled but the wires are still in the system
ken
if it is bad for the other computer why would he say its not?
I even ask him about putting a sports wheel on to do away with the air bag all together , he said this way is the same thing the air bag is disabled but the wires are still in the system
ken
Fleet Owner
Joined: Aug 2005
Posts: 23,668
Likes: 301
From: Easton,Ks
Your mechanics wiring diagrams are wrong and he does not know what he is talking about.
Fuse #8 powers a lot of things beside the air bag module and the PSOM.
The below is from the 1995 F-series Ford Shop Manual.
Look at all the things fuse #8 powers.
You most likely you have a short in the dome light as that is what blows fuse #8 most of the time.
/
Fuse #8 powers a lot of things beside the air bag module and the PSOM.
The below is from the 1995 F-series Ford Shop Manual.
Look at all the things fuse #8 powers.
You most likely you have a short in the dome light as that is what blows fuse #8 most of the time.
/
Fleet Owner
Joined: Aug 2005
Posts: 23,668
Likes: 301
From: Easton,Ks
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
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
Thread Starter
|
Freshman User
Joined: Feb 2006
Posts: 40
Likes: 0
From: n.e. ohio
ok, so i looked at the papers the mechanic gave me,in fact he did remove #5 not #8
it is the airbag moniter.he pulled the whole cluster out and put an amp gauge on it and took it on a road test , amp never went above .05 amps
he also checkedsplice 242 and said it also was good
it is the airbag moniter.he pulled the whole cluster out and put an amp gauge on it and took it on a road test , amp never went above .05 amps
he also checkedsplice 242 and said it also was good
Thread Starter
|
Freshman User
Joined: Feb 2006
Posts: 40
Likes: 0
From: n.e. ohio
I don't know , but when the #8 fuse blows the speedo/odometer goes out it also has the electric shift control thats probably why the trans goes into limp mode.
if the speedo don't work the main computer don't know how fast its going so that limps the trany?
he put a new fuse in #18 and took out #5 and the speedo/odometer works and the trans shifts as normal my truck is just the lx it don't have all the other fancy lites or cruise control through all this the dome lite has worked.
one other thing about a couple months ago the lite in the dash for air bag would blink when driving but then it stoped this was long before the fuse blew
Ijust thought because Idon't drive the truck much it had some thing to do with it
ken
if the speedo don't work the main computer don't know how fast its going so that limps the trany?
he put a new fuse in #18 and took out #5 and the speedo/odometer works and the trans shifts as normal my truck is just the lx it don't have all the other fancy lites or cruise control through all this the dome lite has worked.
one other thing about a couple months ago the lite in the dash for air bag would blink when driving but then it stoped this was long before the fuse blew
Ijust thought because Idon't drive the truck much it had some thing to do with it
ken
Thread
Thread Starter
Forum
Replies
Last Post
rungunner
1994.5 - 1997 7.3L Power Stroke Diesel
45
Jun 12, 2012 07:21 AM
77-250
1987 - 1996 F150 & Larger F-Series Trucks
9
Aug 14, 2010 11:10 AM
pops0329
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
4
Jan 8, 2001 12:45 AM