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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 09-11-2009, 11:08 AM
jimandjimmer jimandjimmer is offline
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OD light blinking

Hey guys I have a 95 150 Supercab 4x4 5.0. It had been sitting for about 8 months with brake problems and I recently had it taken in and had about 850 worth of brake and other work done to it. I had 4 new tires put on, all fluids changed and something called a transtech done to the transmission (it apparently drains all the fluid and then they replace it). I also had a rear ABS sensor put on as my ABS light was showing up on the dashboard. Anyways, after I got my truck back, it runs fine, however I have noticed that my speedometer stopped working and the cruise control wont work either. The overdrive off light that is on my gear shift lever also blinks on and off, there is no apparent code it just blinks on and off and the transmission shifts and works fine. If I am in park or below about ten mph, the OD light does not blink and the speedo needle jumps up and down erratically, but as I pick up speed the needle goes down to 0 and the OD light starts blinking. On another note Ive noticed the last couple of times Ive started my truck up, the engine turns over and idles rough for about 5 minutes and then after it warms up it idles fine and runs strong, there does seem to be a slight miss but im thinking its in one of the spark plugs. Do you guys have any idea about what might be causing the light as well as the rough startup idle?
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Old 09-11-2009, 11:49 AM
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You have a bad or miss installed VSS sensor on the top of the rear end.
They may have also messed up the tone ring when they changed it.
Some other years called this sensor the DSS or ABS sensor.

Why did you have it replaced if it was working fine?
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Old 09-11-2009, 12:01 PM
jimandjimmer jimandjimmer is offline
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it was showing an ABS light before i took it in, thats why i had the sensor replaced.
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Old 09-11-2009, 12:02 PM
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btw what is a tone ring?
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Old 09-11-2009, 12:08 PM
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The tone ring is a ring mounted on the drivers side of the carrier in your rear differential. It has evenly spaced humps on it (very closely together) and then your abs sensor, which doubles as your vss picks up the magnetic pulse off of each hump and that is how it achieves a speed signal or a lock up for the abs
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Old 09-11-2009, 12:32 PM
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Quote:
Originally Posted by jimandjimmer View Post
it was showing an ABS light before i took it in, thats why i had the sensor replaced.
Is the ABS light still on?
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Old 09-12-2009, 06:49 AM
jimandjimmer jimandjimmer is offline
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now it only comes on about once every other day for about 20 minutes or so, i got under the truck yesterday and wiggled the abs connector on my rear end as i was leaving work...the speedo acted like it wanted to work and the light didnt blink, but then it quit and started doing the same thing over again..blinking, erratic jumping of speedo needle etc.
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Old 09-12-2009, 07:01 AM
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They messed something up back there. Either the plug, the sensor or the tone ring.
Was the speedometer was working OK when you took it in?
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Old 09-12-2009, 07:07 AM
jimandjimmer jimandjimmer is offline
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yeah the last time i drove the truck before taking it in, it worked. The ABS light was coming on then, thats why i had them replace the sensor. I dont know what all they done when they installed the new one, i just know that there is a new one on my rear end housing now. The only thing that I think they did inside the rear differential was to pop the bottom of the cover and drain the fluid and replace it with new.
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Old 09-12-2009, 07:16 AM
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You could try unplugging the ABS module under the dash and see if the speedometer starts working again.
If not try checking the voltage from the rear end with a meter.
Put the rear end up on stands and run it slowly up to about 30 MPH.
Does the voltage increase smoothly and continuously from 0 to approximately 3.5 volts (at connector C143) as vehicle speed increases from 0 to 30 mph?

C143 is located at the drivers side hood hinge.
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Old 09-12-2009, 07:23 AM
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Here is a wiring diagram of the 1995 system:
Click the image to open in full size.

C143:
Click the image to open in full size.

/
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95 F150 302 4R70W EB EX-CAB
94 F53 460 E4OD COACHMEN SANTARA RV
83 F150 Flare Side 351W AOD
77 F250 351M-2V NP 435/4 Speed 4X4
subford@gmail.com
Bill K, Kansas Chapter
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Old 09-12-2009, 07:23 AM
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