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Unread 01-04-2012, 10:29 PM   #1
ThunderGod
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1995 YJ Wrangler 
 
Join Date: Jan 2012
Location: La Porte, Indiana
Posts: 4
Speedometer not working

A few weeks ago my speedometer stopped working. I looked up what might be the problem and came across that the speed sensor might be bad. I replaced it and it still wasn't working. One day when I was driving it decides to start working again and hasn't worked since. I checked the speed gear which is fine. Today I took the speedometer out which is one cluster with the tachometer and saw that on the back of the speedometer it had some corrosion on the electrical strip. So I'm thinking it has a sort. My question is can I get a replacement part somewhere or can I install new gauges and how difficult would it be to do. Any help would be appreciated. Thanks

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Unread 01-04-2012, 10:47 PM   #2
Mark05059
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1989 YJ Wrangler 
 
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Location: quechee Vermont
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first thing I would do is remove the speedometer gear from the transfer..grab a drill (cordless or otherwise) and with the key in the on position spin the gear and all and see if your speedo works. If it does then the problem is not in the speedo head. Post your findings after you test it.
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1998 ZJ 5.2 Auto

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Unread 01-04-2012, 11:03 PM   #3
scubamc
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Try cleaning up the corrosion on the strip.
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Unread 01-05-2012, 01:34 AM   #4
ThunderGod
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I'll be sure to try that and I tried cleaning off the corrosion the best I could still didn't work
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Unread 01-05-2012, 07:10 AM   #5
Que89YJ
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1989 YJ Wrangler 
 
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Try what Mark said first with the drill. Are you sure the sensor is in correctly? Did you try clocking the sensor?
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Unread 01-05-2012, 07:27 AM   #6
Mark05059
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Q this is why I do the drill method first. If the upstream works its got to be clocked wrong. If it doesnt work then it could be other things but its easier to figure out with the jeep sitting still
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1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
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Unread 01-05-2012, 08:30 AM   #7
rpenczek
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Um, not sure, but don't think there is a mechnical speedo gear on a 95 (its electronic). I bet the PC board on the speedo is corroded. Search this forum on how to fix the PC board. The guage cluster is easy to remove (very easy) and if you are lucky, you just need to use a pencil eraser to "erase" the corrosion off the circuit lines on the board.

If you erase too hard or your corrosion is too much, you may need to repair the copper lines on the board. You can get a liquid (in waht looks like a big ball point pen) at Radio Shack that will do the trick (its a liquid that when dry repairs copper lines and conducts electricity).

If you are not successful in fixing the board, you can find new ("used") gaugue units on ebay, they run between $75 and $150. You can no longer purchase the cluster new and you can't purchase the pc board either.
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Unread 01-05-2012, 08:41 AM   #8
Que89YJ
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Opihi has a good pic of clocking it:
http://www.jeepforum.com/forum/f12/s...30/index2.html

Yep, you need to clock all them. Yes, the drill first. You test everything by doing the drill.
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Unread 01-05-2012, 05:47 PM   #9
ThunderGod
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Mark I tried what you said the speedometer didn't move you said turn the key on does my jeep need to be running? Now since I tried cleaning off the corrosion when I turn my headlights on the left turn signal stays lite up not blinking on the dash when I turn the headlights off it will blink on the dash but the turn signal bulbs aren't lighting up so like I said before I could have a short I might try what you suggested rpenczek trying to fix the copper lines on the board.
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Unread 01-05-2012, 06:25 PM   #10
Mark05059
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ThunderGod If the speedometer didnt move when you spun the drill (Im guessing you spun it in both directions) with the key on then you could have corrosion at the speedometer, broken wire between the ribbon connector or a bad VCC. You will have to check those out with a meter.


rpenczek, even though the speedometer is electronic it still has a speedometer gear just like a mechanical one would. The drill test is the best way to rule out a clocking problem and test while the jeep is stationary.
__________________
1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
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Unread 01-06-2012, 07:06 AM   #11
Que89YJ
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1989 YJ Wrangler 
 
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Next is to check power at the VSS with the key on you should see:

Blue ECU pin47 = Signal
Brn/Red ECU pin 4 = Ground
Wht/Blk ECU pin 7 = 8VDC power

The output/signal is a square wave and is difficult to check with a digital multimeter but not impossible. If you read the 8vdc on the sensor connector next back probe the signal pin in the connector and hook one meter lead to the pin and the other to a ground wire hooked up to chasis. Set your meter up to read Vdc. Very very slowly turn the gear and watch for the pulsing on the voltage readings on the meter.
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