2002 superduty speedo erratic - maybe ABS module replacement - Great Lakes 4x4. The largest offroad forum in the Midwest

Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Ford Tech
GL4x4 Live! GL4x4 Casino

greatlakes4x4.com is the premier Great Lakes 4x4 Forum on the internet. Registered Users do not see the above ads.
Search
Reply
 
Thread Tools Search this Thread
Old May 8th, 2014, 11:47 AM   #1
Bones
skillicous
 
Bones's Avatar
 
Join Date: 11-06-05
Location: Dearborn Heights, MI
Posts: 11,466
iTrader: (37)
Mentioned: 3 Post(s)
Send a message via AIM to Bones
Default 2002 superduty speedo erratic - maybe ABS module replacement

is this as big of a pain in the ass as it looks like it will be?

I am chasing a wiring/module. I have a CEL, no speedo and ABS light on. CEL is P0500. It's not the VSS on the rear diff. From what I can tell, either the VSS signal isn't getting to the ABS module (I can't confirm that) or the ABS module isn't working (isn't translating the VSS signal into something the PCM can recognise), which is fairly common.

Any tips/tricks?

Vehicle runs great, no shift issues, etc.
__________________
Inviscid Motorsports

Special Thanks and Recommendations to;
Motorcity Machines
Ironman Offroad
Branik Motorsports
Maxxis Tires

Raceline Wheels
PAC Racing Springs
Joint Clutch and Gear

Last edited by Bones; August 4th, 2014 at 11:21 AM.
Bones is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old May 8th, 2014, 12:31 PM   #2
frdboy
Wishin' I waz fishin'
 
frdboy's Avatar
 
Join Date: 03-29-06
Location: Grand Haven, MI
Posts: 10,797
iTrader: (25)
Mentioned: 6 Post(s)
Default

Gas or Diesel?
__________________
Cheap Thrills Off Road

2003 F-250 4X4 7.3 PSD Crew Cab

1971 Bronco
frdboy is offline   Reply With Quote
Old May 8th, 2014, 12:40 PM   #3
frdboy
Wishin' I waz fishin'
 
frdboy's Avatar
 
Join Date: 03-29-06
Location: Grand Haven, MI
Posts: 10,797
iTrader: (25)
Mentioned: 6 Post(s)
Default

Your VSS wires are red/pnk and lt grn/blk, pins 14 and 6 at the ABS module. You can ohm them and it should be the same as whatever your sensor ohms at...I don't remember right now but normally they are 700-2000 ohms. If that is fine you can hook up a voltmeter to them set on a/c voltage and make sure it increases with wheel speed.

I seem to remember fixing one with corroded wires near the module.

If you have to replace the module it will probably need to be set up with an IDS.
__________________
Cheap Thrills Off Road

2003 F-250 4X4 7.3 PSD Crew Cab

1971 Bronco
frdboy is offline   Reply With Quote
Old May 8th, 2014, 12:42 PM   #4
hamsmotorsports
Senior Member
 
hamsmotorsports's Avatar
 
Join Date: 03-07-09
Location: hazel park mi
Posts: 1,033
iTrader: (34)
Mentioned: 1 Post(s)
Default

Check the wire harness at the rear diff. If it's not a sensor 9/10 times it in the harness in the fist 12" from the sensor.
hamsmotorsports is offline   Reply With Quote
Old May 8th, 2014, 01:44 PM   #5
Bones
skillicous
 
Bones's Avatar
 
Join Date: 11-06-05
Location: Dearborn Heights, MI
Posts: 11,466
iTrader: (37)
Mentioned: 3 Post(s)
Send a message via AIM to Bones
Default

Quote:
Originally Posted by hamsmotorsports View Post
Check the wire harness at the rear diff. If it's not a sensor 9/10 times it in the harness in the fist 12" from the sensor.
I did replace the last 12" or so, and the plug.

It is V10 gas
__________________
Inviscid Motorsports

Special Thanks and Recommendations to;
Motorcity Machines
Ironman Offroad
Branik Motorsports
Maxxis Tires

Raceline Wheels
PAC Racing Springs
Joint Clutch and Gear
Bones is offline   Reply With Quote
Old May 8th, 2014, 01:50 PM   #6
frdboy
Wishin' I waz fishin'
 
frdboy's Avatar
 
Join Date: 03-29-06
Location: Grand Haven, MI
Posts: 10,797
iTrader: (25)
Mentioned: 6 Post(s)
Default

I have seen a few that bad ign. coils/ worn spark plugs will cause no speedo and abs light to come on. Hard to track down what coil it is without a lab scope though. It seems the coils get overworked from worn plugs or a coil just creates to much RF noise and f's with the PCM.
__________________
Cheap Thrills Off Road

2003 F-250 4X4 7.3 PSD Crew Cab

1971 Bronco
frdboy is offline   Reply With Quote
Old August 4th, 2014, 10:49 AM   #7
Bones
skillicous
 
Bones's Avatar
 
Join Date: 11-06-05
Location: Dearborn Heights, MI
Posts: 11,466
iTrader: (37)
Mentioned: 3 Post(s)
Send a message via AIM to Bones
Default

so i have been driving this truck on and off, and now the speedo is extremely erratic.

Even when I am sitting still the speedo with sit at around 60 mph, but the speedo changes with brake pedal input (it drops lower). So I am thinking it is still the ABS module, or the wires running through the frame rails have chaffed and are shorting. Any other ideas?

Next steps might be to run new chase wires from the diff to the firewall area and bypass the factor wiring along the frame rail

__________________
Inviscid Motorsports

Special Thanks and Recommendations to;
Motorcity Machines
Ironman Offroad
Branik Motorsports
Maxxis Tires

Raceline Wheels
PAC Racing Springs
Joint Clutch and Gear
Bones is offline   Reply With Quote
Old August 4th, 2014, 06:15 PM   #8
frdboy
Wishin' I waz fishin'
 
frdboy's Avatar
 
Join Date: 03-29-06
Location: Grand Haven, MI
Posts: 10,797
iTrader: (25)
Mentioned: 6 Post(s)
Default

Interesting....

I would like to have a scan tool on it and see what the other modules are seeing for speed. Kinda sounds like a bad cluster but could also be a module messing with the signal.
__________________
Cheap Thrills Off Road

2003 F-250 4X4 7.3 PSD Crew Cab

1971 Bronco
frdboy is offline   Reply With Quote
Old August 5th, 2014, 08:01 AM   #9
Bones
skillicous
 
Bones's Avatar
 
Join Date: 11-06-05
Location: Dearborn Heights, MI
Posts: 11,466
iTrader: (37)
Mentioned: 3 Post(s)
Send a message via AIM to Bones
Default

Quote:
Originally Posted by frdboy View Post
Interesting....
at this point, i find it far from interesting. How much to drive it over to you and drink beer while you fix it?
__________________
Inviscid Motorsports

Special Thanks and Recommendations to;
Motorcity Machines
Ironman Offroad
Branik Motorsports
Maxxis Tires

Raceline Wheels
PAC Racing Springs
Joint Clutch and Gear
Bones is offline   Reply With Quote
Old August 5th, 2014, 11:08 AM   #10
kickstand
sHaMoNe!
 
kickstand's Avatar
 
Join Date: 09-20-06
Location: fenton
Posts: 31,141
iTrader: (46)
Mentioned: 31 Post(s)
Default

does it beep or buzz under the dash?

Not that it matters what your answer is, because I can't help you.

But mine beeped and buzzed under the dash like mad when my speedo took a shit.
kickstand is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Ford Tech

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 01:51 AM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Page generated in 0.17666 seconds with 50 queries