Speed sensor location for 2004 TJ - JeepForum.com
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post #1 of 17 Old 07-02-2011, 03:27 PM Thread Starter
WJL
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Speed sensor location for 2004 TJ

My speedometer is going crazy. It flips all over the place even while in park. The RPM gauge is fine and the engine does not rev, it is only the speedometer needle that moves around randomly, and it doesn't do it all of the time.

I bought a speedometer sensor at Advance this afternoon, but when I went to look for the sensor on my TJ I noticed two on the transmission that look like they could be the one I need to replace. Which one is it? Can someone post a labelled diagram of the exact area where this sensor is?

Thanks!!!

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post #2 of 17 Old 07-02-2011, 03:29 PM
Jerry Bransford
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The speedometer sensor housing mounts onto the side of the transfer case, not the transmission.



Good information on how to work in that area is at http://www.4x4xplor.com/speedo.html

When you have a choice, buy American made.
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post #3 of 17 Old 07-02-2011, 07:32 PM Thread Starter
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Okay, stupid question. I found the speed sensor on the transfer case but how does the plastic wire connector detach from the sensor? I squeezed it as hard as I could but it would not disconnect. Is there some sort of trick to it? Once this piece is off I can easily change it out. Also do I need to oil the seal on the sensor before I put it into the old housing? Thanks!!!!
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post #4 of 17 Old 07-02-2011, 08:54 PM
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Slide the red clip. It locks the plugs together.
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post #5 of 17 Old 07-03-2011, 06:52 PM Thread Starter
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I got the clip off and changed the speedometer sensor but still no change! If not the speed sensor what could it be?
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post #6 of 17 Old 07-04-2011, 08:19 PM Thread Starter
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Anyone???
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post #7 of 17 Old 07-04-2011, 08:56 PM
Jerry Bransford
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Did you read all of the information inside the link I gave you in post #2 above? Odds are that you don't have the speedometer gear housing clocked far enough to the position that causes the speedometer gear to engage its pinion gear inside the transfer case.

When you have a choice, buy American made.
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post #8 of 17 Old 07-05-2011, 01:36 AM
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Run the gauge diagnostic. With the vehicle off. Hold the trip/reset button on the gauge cluster. While holding it in turn the key to run but do not start the vehicle. The gauges will go through their full sweep, the speedometer should stop at 4 positions on the way up and back.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #9 of 17 Old 07-05-2011, 02:22 AM
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Are you experiencing any other electrical anomalies? Loose grounds are notorious for causing gauges to intermittently go crazy.
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post #10 of 17 Old 07-05-2011, 04:25 AM
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Agree with Jerry - if the sensor is not clocked correctly it will give you random speed readings (happened to me)....

Has your check engine light come on? (4x4xplor.com image)
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speedo07.jpg  
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post #11 of 17 Old 07-05-2011, 05:33 AM Thread Starter
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Jerry -- I never removed the piece that the arrow above is pointing to. I only removed the speed sensor so the numbers are still aligned with the dot. I will try the diagnostic suggested above when I get home.
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post #12 of 17 Old 07-05-2011, 10:17 AM Thread Starter
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And as far as electrical problems that I have noticed that may be associated with this problem, when the speedometer is acting up and I have the emergency brake engaged (in park), the emergency brake gives me a dinging sound because it *thinks* I am in "drive." But other times when the speedometer is not acting up it does not give that signal.
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post #13 of 17 Old 07-05-2011, 11:58 AM
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If the speedo is jumping its probably a grounding issue and not an issue with the actual gear. In the pic Jerry posted you remove the 10mm holding the U shaped piece to remove the gear. If the Gear was bad or not clocked properly your speedo would be jumpy/intermittant but only while you were driving. It would be randomly grabbing and spinning causeing it to jump, but if its jumping while not moving this isnt the problem.

Lots of people have had problems with the cluster due to poor grounds, id look ino0t it.
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post #14 of 17 Old 01-31-2014, 07:32 PM
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I am having the same issue with my jeep, does anyone know what conclusions he came to and how it was fixed? Thanks.
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post #15 of 17 Old 04-30-2014, 08:22 PM
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Invalid

'02 TJ X Apex Edition
'00 XJ Sport
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