Auto Mechanic in the Forum?
Comments
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If the sensor is functioning but returning an incorrect reading, that will not show an error code. The operational voltage of teh speed sensor and any other sensor has to drop below or go above an allowable range to trigger a light. It is very possible that the sensor could be faulty but not returning a code.
However, if the vehicle does not have ABS braking, it is unlikely that faulty speed sensor would return a code in a 1995 vintage vehicle. OBD2 was not mandated on cars until 1997-98 model years. A 1995 Explorer is very likely OBD1 and does not necessarily have the accommodations to monitor vehicle speed in that way.
Jstas - I'm not familiar with Fords as I am a former GM service engineer so what you are saying may be true. However the diagnostics in 1995 across manufacturers were fairly sophisticated. I just don't see the speedo being that far off without tripping a code. I own a transmission shop as one of my side businesses. Maybe I'll have my guys look at Alldata and see what it really takes to trip a code with this scenario. Chris -
here is an interesting link....(trying to learn as this is applicable to my 4x4 TJ wrangler and oversize from stock and on ford 8.8 axle swaps)
http://www.explorer4x4.com/speedo.html
it would be interesting to know what your gearing is set up as
and what speedo gear is installed
Ford part # C1DZ-17271-A 20-tooth gear. A black gear.
The 19 tooth gear is a pinkish color.
$7.75 -
I have trouble believing this issue is electrical over being mechanical.
Read not a sensor issue. IMHO
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Conrad Johnson PV-5 pre-amp
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If you can peek up under the dash or look at the trans/transfer case, see if there's a speedo drive cable used. (cable in this sense means a round housing w/ rotating flex shaft inside) If no drive cable is used-it's all electronic and needs to be hooked to an analyzer. Note: I think ABS systems are usually disengaged when 4WD is in used.
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Before the sensor can "Sense" the speed of the vehicle the sensor as a gear thing
And I be looking at the transmission.
Speakers
Carver Amazing Fronts
CS400i Center
RT800i's Rears
Sub Paradigm Servo 15
Electronics
Conrad Johnson PV-5 pre-amp
Parasound Halo A23
Pioneer 84TXSi AVR
Pioneer 79Avi DVD
Sony CX400 CD changer
Panasonic 42-PX60U Plasma
WMC Win7 32bit HD DVR -
I sure hope you consulted with your trusted professional because when I took the question to my "Chief Mechanic"
he did not want to guess and needs to physically diagnose the symptoms and determine the true root cause.
...MY BAD for sticking my opinion...
GOOD LUCK !... and let us know what the final outcome is ! -
I'm just gonna throw this one out there. I don't know how sophisticated the computer is, but.... If the truck had a chip or was programmed, some of the diagnostics can be disabled, and corrections can be made for different tire sizes/gearing etc. If the previous owner had a chip or programmer, they may not have removed the chip or flashed it back to factory. I know it's definitely possible with newer vehicles, but not sure about yours. If that's the case, then pull the computer and make sure there isn't a chip piggybacked on it, or if it can be flashed, have it flashed back to factory. I'm not saying that's your problem, but it's possible. Other than that I say speed sensor.Sony 40" LCD
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When rapture comes, can I have your car? -
Anyone know the specs for the diff gears on the speedo sensor?
One is Pink and one is a dark Purplish color.
The one in my 2dr sport is the Purplish color with the 235/75/15 tires
My neighbors He is junking is a 4dr with 225/75/15 tires is Pink.
Are these correct?
I haven't found any repair manual that tells the specs for the diff color gears.
Yamaha RX-A710 90Watt 7.1
Mains: RTi A1's Center: CS150 Sats: RT15i's Sub: Velodyne DPS-10
Music CD: Sony CDP-CE375 5 Disk
HD TV: Vizio 42" LCD 1080p E420VO
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AV Rack: Sanus Euro EFAB-II Audio Base x2 EFAS-II Audio Expansion Shelf x4
Cables Used: Monster Cable HPD Sony HDMI DLCHE18W
Phones: Sennheiser HD280 Pro -
If you can peek up under the dash or look at the trans/transfer case, see if there's a speedo drive cable used. (cable in this sense means a round housing w/ rotating flex shaft inside) If no drive cable is used-it's all electronic and needs to be hooked to an analyzer. Note: I think ABS systems are usually disengaged when 4WD is in used.
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MusicHall MMF 2.1 TT -
I found a place that has all the diff gears!
For Ford Ranger/Bronco II/Mazda B series and Explorer.
http://www.therangerstation.com/tech_library/Speedogear.html
Yamaha RX-A710 90Watt 7.1
Mains: RTi A1's Center: CS150 Sats: RT15i's Sub: Velodyne DPS-10
Music CD: Sony CDP-CE375 5 Disk
HD TV: Vizio 42" LCD 1080p E420VO
Blu-Ray: Sony BDP-S350
DVD: Sony DVP-NC665P 5 Disk
AV Rack: Sanus Euro EFAB-II Audio Base x2 EFAS-II Audio Expansion Shelf x4
Cables Used: Monster Cable HPD Sony HDMI DLCHE18W
Phones: Sennheiser HD280 Pro -
So did that website help you any?
Speakers
Carver Amazing Fronts
CS400i Center
RT800i's Rears
Sub Paradigm Servo 15
Electronics
Conrad Johnson PV-5 pre-amp
Parasound Halo A23
Pioneer 84TXSi AVR
Pioneer 79Avi DVD
Sony CX400 CD changer
Panasonic 42-PX60U Plasma
WMC Win7 32bit HD DVR -
disneyjoe7 wrote: »So did that website help you any?
Some....I switched the gear from a purple to a tan but haven't tried it yet.
Before with the purple gear I figure when I was doing 70mph the final OD would kick in. That happens around 55mph.
Just a guess but I think someone toasted the original transmission and possibly swapped one from a 4dr that uses 215 or 225 tires.
My neighbors that is being junked.....the speed sensor electric plug-in had the locking ears broke off like someone switched it.
Someone put 235 tires on his and "I think" swapped in the tan gear to compensate?
I'll know more once I test it....was just to tired and sore last nite after climbing around on the hard floor.
Uggggggg :rolleyes:
Yamaha RX-A710 90Watt 7.1
Mains: RTi A1's Center: CS150 Sats: RT15i's Sub: Velodyne DPS-10
Music CD: Sony CDP-CE375 5 Disk
HD TV: Vizio 42" LCD 1080p E420VO
Blu-Ray: Sony BDP-S350
DVD: Sony DVP-NC665P 5 Disk
AV Rack: Sanus Euro EFAB-II Audio Base x2 EFAS-II Audio Expansion Shelf x4
Cables Used: Monster Cable HPD Sony HDMI DLCHE18W
Phones: Sennheiser HD280 Pro