short in wire....speedometer problem
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Elder User
Joined: Aug 2003
Posts: 859
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From: philly pa
short in wire....speedometer problem
95 F150 I6 2wd M5OD
A few weeks ago I began having a problem w/my speedometer jumping around. Whenever the needle would jump around the truck would also buck. Another interesting observation is that, even in neutral, if the truck began to coast at low speeds the truck would stall, even moving from a dead stop on a hill. Because it was in neutral I knew the problem had to be electrical.
I originally posted this in the electrical forum, but through the course of the day it only received 6 views and no responses.
I unplugged the ABS sensor, where the truck gets the speedometer reading and that fixed the bucking and stalling, but now I have no speedometer and naturally my odometer reading doesn't move. After running diagnostics on it I narrowed it down to a short in a wire, I'm assuming one of the wires that runs from the ABS sensor to the ignition control modual. I now have three questions.
1. Has anybody ever experienced a problem like this?
2. How do you test the wire to find which one is bad?
3. Where can I located the correct color coded replacement wires so that I can use the manual for future repairs.
Other than this problem the truck runs perfectly.
A few weeks ago I began having a problem w/my speedometer jumping around. Whenever the needle would jump around the truck would also buck. Another interesting observation is that, even in neutral, if the truck began to coast at low speeds the truck would stall, even moving from a dead stop on a hill. Because it was in neutral I knew the problem had to be electrical.
I originally posted this in the electrical forum, but through the course of the day it only received 6 views and no responses.
I unplugged the ABS sensor, where the truck gets the speedometer reading and that fixed the bucking and stalling, but now I have no speedometer and naturally my odometer reading doesn't move. After running diagnostics on it I narrowed it down to a short in a wire, I'm assuming one of the wires that runs from the ABS sensor to the ignition control modual. I now have three questions.
1. Has anybody ever experienced a problem like this?
2. How do you test the wire to find which one is bad?
3. Where can I located the correct color coded replacement wires so that I can use the manual for future repairs.
Other than this problem the truck runs perfectly.
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
The truck doesn't get the speedometer reading from the ABS sensor, it gets it from the VSS (vehicle speed sensor). That's what you unplugged. It's basically a magnet that is so simplistic it never fails. Take it out and clean it off with a rag. If that doesn't fix the problem, it's most like the speedo unit in the gauge cluster.
Do a search on this, it's been covered a lot in this forum.
Do a search on this, it's been covered a lot in this forum.
Thread Starter
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Elder User
Joined: Aug 2003
Posts: 859
Likes: 0
From: philly pa
Originally Posted by andym
The truck doesn't get the speedometer reading from the ABS sensor, it gets it from the VSS (vehicle speed sensor). That's what you unplugged. It's basically a magnet that is so simplistic it never fails. Take it out and clean it off with a rag. If that doesn't fix the problem, it's most like the speedo unit in the gauge cluster.
Do a search on this, it's been covered a lot in this forum.
Do a search on this, it's been covered a lot in this forum.
As far as the speedometer unit in the guage cluster: Would that actually make the truck studder and stall? Also, Can I replace the speedo part and keep my current odometer? Thanks alot for the reply.
Last edited by jessfactor; Jul 26, 2005 at 10:00 PM.
