little help (Rubicon speedometer issue) - JeepForum.com
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post #1 of 17 Old 12-22-2017, 03:19 PM Thread Starter
kcdee00
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little help (Rubicon speedometer issue)

Looking for a little help and some suggestions....I bought a 04 Rubicon after having and building a couple JK's and YJ's TJ's lol...The speedometer on the TJ is not working correctly..It is reading WAAAY fast-like when I take off jumping up to 40-50...basically reading 50-60mph over......It is a Rubicon, and has a different speed sensor (factory part)which I replaced to no avail...The end of the transfer case has a lot of oil on it with the underside of the Jeep. Not real sure where to look after that..Maybe open up the back of the tcase to see if whatever the sensor reads is messed up? Of course at about real-time 55 or so with speedo over 100, the jeep will govern itself out...


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post #2 of 17 Old 12-22-2017, 05:06 PM
biffgnar
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Make sure the yoke nut is fully torqued. It is all that holds things together inside the tail housing and so if it is loose the tone ring inside will not read on the sensor correct.
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post #3 of 17 Old 12-22-2017, 05:22 PM Thread Starter
kcdee00
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I just got the jeep and I knew the speedo didn't work right..thought it was probably the sensor....I didn't have any vibes, but after I greased the joints on the driveshaft, I got some...replaced the ujoints and all is good there..I will pull the driveshaft off and check the yoke is tight..I will probably go ahead and pull that back part off...I think it should be pretty easy to tell what/if something is wrong! When I put the speed sensor in, I felt in the hole and felt only smooth..I am still checking to see if the tone ring should be smooth or have teeth.
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post #4 of 17 Old 12-24-2017, 06:02 AM
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Quote:
Originally Posted by kcdee00 View Post
I am still checking to see if the tone ring should be smooth or have teeth.
The tone wheel has 3 equally spaced "teeth".

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post #5 of 17 Old 12-24-2017, 07:53 AM
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The rear output flange/dampener is keyed on the shaft (with a tiny pin). See if the flange is installed in the correct position.
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post #6 of 17 Old 12-24-2017, 04:46 PM Thread Starter
kcdee00
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I read another post where people where just resetting the PCM so I tried that to no avail. Iím going to leave it unhooked from the battery all night and see if that helps. If not, hopefully I can get into the back of the tcase soon.

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post #7 of 17 Old 12-24-2017, 06:03 PM
Jerry Bransford
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Be wary after removing the nut that holds the tcase output shaft yoke on. The tone wheel inside can side down out of position when you do and when it does, it can rotate out of position so its slot that keys it to a pin in the shaft will be out of position so it won't seat properly when the nut is reinstalled and tightened. It happened to me, here are the pics of what the pin did when I tried tightening the nut to spec, I had to replace the pin.

That second smaller slot in the tone wheel is what happened when I tightened the nut with the tone wheel out of position.
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241 Tone Ring 2.jpg  
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post #8 of 17 Old 12-25-2017, 07:59 PM
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Itís a pcm reset problem. Every time I unhook the battery on my 04 Rubicon I have to take it to the dealer. They hook it up to their computer and reset it. So I donít unhook the battery anymore. It hits the speed limiter at about 35mph. But the speedometer reads 100.
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post #9 of 17 Old 12-26-2017, 08:58 AM Thread Starter
kcdee00
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Quote:
Originally Posted by Joedert View Post
Itís a pcm reset problem. Every time I unhook the battery on my 04 Rubicon I have to take it to the dealer. They hook it up to their computer and reset it. So I donít unhook the battery anymore. It hits the speed limiter at about 35mph. But the speedometer reads 100.
Iíve tried the unhook the battery cable and touch together headlight on off PCM reset and it hasnít worked. I also left the battery unhooked all night and that didnít help. Did the dealer charge you to hook it up and reset?

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post #10 of 17 Old 12-26-2017, 11:19 AM
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You mention there being quite a bit of oil on the transfer case, is any of that oil getting into the speed sensor connector?

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post #11 of 17 Old 12-26-2017, 12:39 PM Thread Starter
kcdee00
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Not really... itís mostly around the yoke he ds is hooked to. I already tried to change out the sensor and it looked pretty clean and dry in the connector. I donít have time to dig in the back of the tcase right now to get any farther


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Originally Posted by mukluk View Post
You mention there being quite a bit of oil on the transfer case, is any of that oil getting into the speed sensor connector?

04 Rubicon
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post #12 of 17 Old 12-26-2017, 02:35 PM
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Does the speedometer still act erratically if you leave the VSS disconnected?

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post #13 of 17 Old 12-26-2017, 07:19 PM Thread Starter
kcdee00
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No it doesnít register anything unplugged


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Originally Posted by mukluk View Post
Does the speedometer still act erratically if you leave the VSS disconnected?

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post #14 of 17 Old 12-26-2017, 07:26 PM
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Can you verify you're getting a steady 5V at the VSS connector pin 1 (VT/WT), and that you have a good low resistance ground at pin 2 (BK/LB)?

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post #15 of 17 Old 12-26-2017, 07:55 PM Thread Starter
kcdee00
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Iíll check and get back

Quote:
Originally Posted by mukluk View Post
Can you verify you're getting a steady 5V at the VSS connector pin 1 (VT/WT), and that you have a good low resistance ground at pin 2 (BK/LB)?

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