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Old 03-24-2011, 05:22 PM   #1
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Speedometer Quit

I was driving down the road and my speedometer quit working. Is this a common problem ? Also, is it most likely the speedometer, a cable or something in the transmission. Thanks in advance for any help !

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Old 03-24-2011, 05:46 PM   #2
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Well without knowing what year you have its hard to say if its the speed sensor or the cable. But I'm betting its the speed sensor which is on the tcase I believe but I'm not sure as I've never pulled mine apart. I believe aftre 92 they went to an electronic sensor which sends a signal to the cluster.

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Old 03-24-2011, 06:46 PM   #3
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We have a 95,
Ours makes noise sometimes, like a cable needs to be lubed
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Old 03-25-2011, 11:13 AM   #4
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i know when i replaced my tcase on my 91 it was on the rear on it
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Old 03-25-2011, 11:37 AM   #5
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Look for an electrical connection near the rear output shaft on the t-case. I would assume that the sensor took a dump on you, but it could be the speedometer itself though, I guess. The sensor is held in by a 10mm bolt I think, and the it pulls out of the case pretty easily.
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Jeep Wrangler Speed Sensor at 1AAuto.com.
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Old 03-25-2011, 12:15 PM   #6
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did you try doing the OBD codes? it should tell you if it isnt recieveing a signal from the speed sensor.

try this site OBDI Error/Check Engine Codes - JeepForum.com Community Jeep Wiki
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Old 03-25-2011, 12:22 PM   #7
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Mine wiggles loose sometimes

Check the cable... just might be loose (like was said previously)
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Old 03-26-2011, 08:39 AM   #8
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Most of the threads I have read around here on this same issue have been fixed by replacing the cable. My speedo likes to bounce around when I'm going under 60mph, so I'll probably end up having to fix mine pretty soon.

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Old 03-26-2011, 12:58 PM   #9
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I had a 95 YJ, and water started leaking from the windshield frame joint, which shorted out the circuit board on the speedo. I was able to buy a tracer board pen and repair it.

I want to say my YJ had a vehicle speed sensor, it wasn't cable operated. Its been a while though. In that case you'll want to check for a "pulse" from the speed sensor, they do quit occasionally.
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Old 03-27-2011, 04:56 PM   #10
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im in the same boat, i replaced the sensor on the tcase and that didnt cut it..i just recently replaced the cluster and it still doesnt work. idk whats wrong
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Old 03-27-2011, 08:01 PM   #11
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im in the same boat as well, but my head is good, as is my cable, and also the gear in the tcase, so where so i go from there?
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Old 03-28-2011, 07:09 AM   #12
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Quote:
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im in the same boat as well, but my head is good, as is my cable, and also the gear in the tcase, so where so i go from there?
Beg, borrow or steal an oscilloscope, jack up your jeep's rear axle, block the front, let it run in first gear, and then probe the vehicle speed sensor. If you get a wave on the oscilloscope, then follow the wiring harness until you reach the cluster, testing for the same wave at each connection. If you have one still at the cluster, verify all the grounds, and make sure the cluster is getting power.

Happy hunting.

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Old 03-28-2011, 09:20 AM   #13
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Quote:
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Beg, borrow or steal an oscilloscope, jack up your jeep's rear axle, block the front, let it run in first gear, and then probe the vehicle speed sensor. If you get a wave on the oscilloscope, then follow the wiring harness until you reach the cluster, testing for the same wave at each connection. If you have one still at the cluster, verify all the grounds, and make sure the cluster is getting power.

Happy hunting.

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i have a 1987 wrangler with a 4.2l, and if i remember right i dont have a speed sensor, its a straight system of gears in tcase, cable, head, but il double check later
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Old 03-28-2011, 03:48 PM   #14
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what the hell is an oscilloscope..isnt that the gadget they used in ghost busters
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Old 03-28-2011, 03:54 PM   #15
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Quote:
Originally Posted by ClayL
i have a 1987 wrangler with a 4.2l, and if i remember right i dont have a speed sensor, its a straight system of gears in tcase, cable, head, but il double check later
Yes it is my 1990 is the same way
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Old 03-28-2011, 04:42 PM   #16
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I did a quick Google search and found that there are 2 different CABLES for 1988-1990 Jeeps, depending on if you have cruise control or not. There is another CABLE for 1991-1993, and it is a SENSOR from 1993-1995. Neither the cable nor the sensor should be difficult to diagnose just by crawling underneath or pulling the gauge cluster out. Good Luck
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Old 03-28-2011, 06:12 PM   #17
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what the hell is an oscilloscope..isnt that the gadget they used in ghost busters
^^^ awesome
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Old 03-28-2011, 06:14 PM   #18
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I did a quick Google search and found that there are 2 different CABLES for 1988-1990 Jeeps, depending on if you have cruise control or not. There is another CABLE for 1991-1993, and it is a SENSOR from 1993-1995. Neither the cable nor the sensor should be difficult to diagnose just by crawling underneath or pulling the gauge cluster out. Good Luck
im starting to think its the gear in my tcase, so i might pick up another when i feel like having a working speedo lol
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Old 03-29-2011, 07:59 PM   #19
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Glad to know I'm not the only one without a working speedometer...would this be an easy fix for a 1990 yj, no cruise, stock wheels?
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Old 05-08-2011, 11:15 AM   #20
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I recently purchased a 88 jeep wrangler and the speedometer did not work. I bought the gear put it the transfer case and still nothing? Is there a how to with pictures or video? Looks pretty straight forward, I have tried to or three angles. Any help would be great thanks!
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Old 05-08-2011, 01:39 PM   #21
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This was a little different than mine but it helped me out a lot. Hope I can help you out as well.


If you have just replaced your speedo gear and now your speedo isn't working, this very well may fix your problem. For those of you who have just installed a SYE, you will want to see the pix at the bottom of this write up.

Now for you guys who have the stock Transfercase (TC) and you just change your speedo gear because you either changed your gearing or put on larger tires, you may have reinstalled your speedometer off calibration.

On your TC, there will be a little nipple or hump





Now look on your sending unit (speedo) and you will find two sets of numbers. 26-31 and 32 -36. These are your calibration number that you will use to line up on the "nipple". Your new gear will be in the set of numbers on the unit. If you installed a 34 tooth gear, then you would line up the 32-36 set of numbers.





Now install the sending unit into the TC being sure to line up the numbers that apply to the gear you installed with the nipple. You may have to tweak the unit a little for the hold down clamp to line up. What is important is that the numbers are within proxemity of the nipple.



And thats it. really pretty simple. Fasten down the hold down clapm and you are good to go. If yout speedo still doesnt work, then very possibly you may have a bad unit or the electrical contacts are dirty.


Now for you SYE guys/gals...there is NO NIPPLE or hump on the tail houseing of the SYE. What you do is you line up the correct speedo numbers with the clamp.




Real simple..Hope this helps.

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