YJ speed/tach gauge cluster

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Dent Cordell
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YJ speed/tach gauge cluster

Post by Dent Cordell » Fri Aug 09, 2019 12:34 pm

Anyone have a spare electronic gauge cluster that I could borrow or buy to troubleshoot a faulty speedometer? It’s in a 95 YJ with electronic gauges. Replaced the sensor at the trans but still no spedo/odometer though the tach works fine.
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Re: YJ speed/tach gauge cluster

Post by Matt Brown » Fri Aug 09, 2019 5:00 pm

You should be able to put the rear up on jackstands and watch the speedo pulse in the gauge cluster wire with an o scope to make sure you are getting a signal from the t-case speed sensor. can also use a pulse generator set to 5v square wave out and as you crank up the pulse speed, the speedo should climb. 50 hz should see about 45 on the speedo. does the jukebox repair shop have the needed test equipment?
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Re: YJ speed/tach gauge cluster

Post by TSEJEEPERS » Sat Aug 10, 2019 8:25 am

There are a number of different ways to clock the sensor.
You may need to play with it some to find the sweet spot.
To know for sure whether it is the sensor or the cluster, you can attach a drill to the sensor. Where the gear is, and spin it to see if the speedometer works or not.
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Dent Cordell
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Re: YJ speed/tach gauge cluster

Post by Dent Cordell » Sat Aug 10, 2019 9:02 am

Did the drill test (in both directions) and got nothing. We’ll have to try the electrical test approach.
Also noticed that the pin out of the sensor matches the pin that enters the back of a mechanical YJ gauge that I happen to have. What do you think would happen if I attached a mechanical cable?
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Re: YJ speed/tach gauge cluster

Post by wdln » Sun Aug 11, 2019 3:47 pm

Matt Brown wrote:
Fri Aug 09, 2019 5:00 pm
Does the jukebox repair shop have the needed test equipment?
The jukebox shop has an oscilloscope but not a pulse generator. Daren, maybe we should take a look in the Haynes manual about clocking the sensor as Tom said. Perhaps it's clocked in such a way that it has no output.
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Re: YJ speed/tach gauge cluster

Post by wdln » Sun Aug 11, 2019 4:09 pm

As a reminder, this is what Daren looks like when he accidentally goes too fast in a Jeep.

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Re: YJ speed/tach gauge cluster

Post by Matt Brown » Mon Aug 12, 2019 3:24 pm

wdln wrote:
Sun Aug 11, 2019 3:47 pm
Matt Brown wrote:
Fri Aug 09, 2019 5:00 pm
Does the jukebox repair shop have the needed test equipment?
The jukebox shop has an oscilloscope but not a pulse generator. Daren, maybe we should take a look in the Haynes manual about clocking the sensor as Tom said. Perhaps it's clocked in such a way that it has no output.
I may have a pulse generator that could be brought up to the hog eat if it hasn't been resolved by then. Need to look into deep deep storage.
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