Speedometer not working...speed sendor? - JeepForum.com
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post #1 of 23 Old 10-05-2019, 04:22 PM Thread Starter
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Speedometer not working...speed sendor?

The speedometer on my '94 YJ suddenly stopped working yesterday during normal driving, never had any problems prior....only thing I have done is recently changed out the speedometer gear to account for the 33" tires and 4.10 gears.

I checked the harness/plug going into the sensor, it looks fine. I did get a code last night while driving, 15 No vehicle speed sensor signal detected during driving load conditions. Do the speed sensors just "fail", or should I be looking elsewhere?


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post #2 of 23 Old 10-05-2019, 05:26 PM
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Its it fully "clocked and engaged?

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post #3 of 23 Old 10-05-2019, 06:47 PM
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You might have made the same mistake I did and not realized the speedo gear housing needs to be 'clocked' to a certain position depending on the size gear you installed. I chewed up two gears before I got it right.
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post #4 of 23 Old 10-07-2019, 02:02 AM Thread Starter
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Should have added, the speedometer gear was changed over a month ago, and the speedometer had been working fine....sensor is correctly clocked (at least clocked the exact same way as before the swap), and plug is still connected. Speedometer simply stopped working all together while driving the other night, everything else on the dash is fine.

My immediate thought was the speed sensor, considering the sudden nature of the failure, but this is the first time I'm dealing with any sort of speedometer issue.

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post #5 of 23 Old 10-07-2019, 08:51 AM
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Quote:
Originally Posted by jason280 View Post
Should have added, the speedometer gear was changed over a month ago, and the speedometer had been working fine....sensor is correctly clocked (at least clocked the exact same way as before the swap), and plug is still connected. Speedometer simply stopped working all together while driving the other night, everything else on the dash is fine.

My immediate thought was the speed sensor, considering the sudden nature of the failure, but this is the first time I'm dealing with any sort of speedometer issue.
There are 3 different positions the speedo gear housing can be clocked to that is dependent on the number of teeth on the gear. The positions are 26-31 teeth, 32-38 teeth, and 39-41 teeth.

Going from one size to usually affects the clocking. How many teeth were on the old gear and how many on the new gear? If it not clocked correctly, the speedo may work for a while before the plastic teeth get chewed up.

Assuming you are going from your stock gear (27" tires and 3.07 gears) with 31 teeth, to a 35 tooth gear to go with 33's and 4.10 gears, you're going to have to re-clock it and need a new gear if it's chewed up.

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post #6 of 23 Old 10-07-2019, 09:58 AM
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Quote:
Originally Posted by letitloose06 View Post
There are 3 different positions the speedo gear housing can be clocked to that is dependent on the number of teeth on the gear. The positions are 26-31 teeth, 32-38 teeth, and 39-41 teeth.

Going from one size to usually affects the clocking. How many teeth were on the old gear and how many on the new gear? If it not clocked correctly, the speedo may work for a while before the plastic teeth get chewed up.

Assuming you are going from your stock gear (27" tires and 3.07 gears) with 31 teeth, to a 35 tooth gear to go with 33's and 4.10 gears, you're going to have to re-clock it and need a new gear if it's chewed up.
I was gonna say this but he beat me to it.

Pull it and check the gear you also need to look in and check the sleeve on the main shaft that drives that gear

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post #7 of 23 Old 10-08-2019, 11:22 AM Thread Starter
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I had no idea you had to clock the position based on the number of teeth...



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post #8 of 23 Old 10-08-2019, 03:46 PM Thread Starter
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Well, not quite fixed yet. I reinstalled my original speedometer gear, and left the sensor/sending unit in the same clocked position its always been in, but still no speedometer. I'm curious now if the sensor is bad, and the damaged gear was still able to spin (even with the stripped teeth).

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post #9 of 23 Old 10-08-2019, 04:29 PM
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using the damaged gear, put the end in a drill and spin it while the jeep is on and connected.... The speedo should move

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post #10 of 23 Old 10-08-2019, 10:03 PM
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Your profile says you have a SYE. The SYE speedo drive gear in the output shaft is also plastic. It may be stripped as well.
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post #11 of 23 Old 10-08-2019, 10:11 PM
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Yup, that's what happens when you clock it wrong. I have two gears in a box that look just like that.

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post #12 of 23 Old 10-09-2019, 07:58 AM
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I bet the gear that that one mates to on the mainshaft is toast.

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post #13 of 23 Old 10-10-2019, 01:47 AM Thread Starter
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Quote:
Your profile says you have a SYE. The SYE speedo drive gear in the output shaft is also plastic. It may be stripped as well.
Hmmm, this is certainly not what I wanted to hear. I'll try spinning the sensor/gear assembly with it removed, and see if it moves the speedometer. Probably go ahead and check the gear in the SYE while I'm therewith it removed. I honestly can't remember which SYE I'm using, maybe Rugged Ridge, but I assume the internal gear is generic and works with all brands? Is this something easily replaceable?

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post #14 of 23 Old 10-10-2019, 04:47 AM
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Quote:
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Hmmm, this is certainly not what I wanted to hear. I'll try spinning the sensor/gear assembly with it removed, and see if it moves the speedometer. Probably go ahead and check the gear in the SYE while I'm therewith it removed. I honestly can't remember which SYE I'm using, maybe Rugged Ridge, but I assume the internal gear is generic and works with all brands? Is this something easily replaceable?
Hopefully your SYE gear is ok, but if it needs to be replaced... Easy if you are mechanical and have some basic good tools, but time consuming, the SYE /T case needs to come apart...

https://www.jeepforum.com/forum/f12/...-still-695330/

Post #5 second pic shows the gear, its the light blue thing. Unfortunately his pics are ruined by photo bucket.

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post #15 of 23 Old 10-12-2019, 05:53 AM Thread Starter
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I finally had a chance to check the gear, looks like it has some damage st the beginning of the teeth toward the rear of the SYE.

Is it just a matter of puller the SYE housing to replace the gear, or does the entire TC have to be pulled?




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