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Speedometer is reading 4x fast

Discussion in 'Wrangler TJ (1996-2006)' started by LEEDAWG, Sep 13, 2016.

  1. Sep 13, 2016 at 10:36 AM
    #1
    LEEDAWG

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    LEEDAWG [OP] Member

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    I have a 04 jeep rubicon my speedometer is reading 4x fast, cluster is reading the same as pcm.

    The sensor has been replaced 2 times and pcm has been replaced 2 times and i've ran new wires from pcm to sensor. Also have disconnected battery and touched cables together at least 50 times and have did pcm reset with DRB111 about 50 times. Also have a perfect 5 volt square wave with scope, and i have removed cluster and test drove pcm. It still reads 4 times fast and my relucter ring in transfer case has 3 cogs.

    Thanks in advance for any help.
     
    Last edited by a moderator: Sep 13, 2016
    LEEDAWG, Sep 13, 2016
    #1
  2. Sep 13, 2016 at 12:31 PM
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    C2T

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    C2T Well-Known Member

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    Earl;

    Is this jeep new to you? Did you just make any major changes? Did it just happen one day out of the blue?

    :)
     
    C2T, Sep 13, 2016
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  3. Sep 13, 2016 at 12:55 PM
    #3
    LEEDAWG

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    LEEDAWG [OP] Member

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    i bought it like this, only thing that has been done to it before i got it was a new starter and radiator, and it has 285 75 16 in tires which would not make but a slight difference. I'm at wits end.
     
    LEEDAWG, Sep 13, 2016
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  4. Sep 13, 2016 at 1:17 PM
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    C2T

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    C2T Well-Known Member

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    ...that would only make about 5mph diff at 65mph. Why I asked is...if the last owner set it up for larger tires then it could simply be it has not been re-calibrated back to the smaller, stockish tires. ??? Just tossing around ideas......

    I know you say it has not been changed but have you verified you have the correct gear for the sensor? You have checked all the things you think it can be...humor me :) and check one you think can't be the issue.
     
    C2T, Sep 13, 2016
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    JKBob 25 likes this.
  5. Sep 13, 2016 at 2:03 PM
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    LEEDAWG

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    LEEDAWG [OP] Member

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    no gear, has speed sensor.
     
    LEEDAWG, Sep 13, 2016
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  6. Sep 13, 2016 at 2:32 PM
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    C2T

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    C2T Well-Known Member

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    I deleted my comments here to make myself look better. (a little less dense) For someone who hates being wrong so very much...I sure do manage it so very often. haha
     
    Last edited: Sep 13, 2016
    C2T, Sep 13, 2016
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    JKBob 25 and chris4x4 like this.
  7. Sep 13, 2016 at 2:35 PM
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    C2T

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    C2T Well-Known Member

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    I am assuming you have just replaced that top piece (the sensor) and have not verified the speedometer gear housing (the sensor attaches to this) and the gear (under the housing).

    Am I getting warmer??? or do I have to come back looking like: :anonymous:
     
    C2T, Sep 13, 2016
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    JKBob 25 likes this.
  8. Sep 13, 2016 at 2:37 PM
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    LEEDAWG

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    LEEDAWG [OP] Member

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    I've already replaced it 2 times with sensor from dealer it has no gear, from my understanding wrangler's have gear's and Rubicon's have sensor's.
     
    LEEDAWG, Sep 13, 2016
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  9. Sep 13, 2016 at 2:52 PM
    #9
    C2T

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    C2T Well-Known Member

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    Stranger things have happened. A different transfer case....(241 vs 231) Makes sense. Damn....well ok :anonymous:

    lol ...and since you have replaced the PCM... That was all I had.

    I am going to go suck my thumb in a corner for a while.....

    I will be back if I have any "enlightened" ideas. :sorry:
     
    C2T, Sep 13, 2016
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    JKBob 25, chris4x4 and Bob like this.
  10. Sep 13, 2016 at 4:07 PM
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    LEEDAWG

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    LEEDAWG [OP] Member

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    thank you, all help is appreciated.
     
    LEEDAWG, Sep 13, 2016
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  11. May 11, 2017 at 7:18 PM
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    JKBob 25

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    JKBob 25 Well-Known Member

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    I know this is a some what old thread. But after reading it. I was curious if leedawg ever figured out the issue. I enjoy learning issues and their fixes.
    It's like a bad murder mystery. You still want to know who killed the butler. Lol.
    And C2T. Hope you have taken that bag off your head by now. Lol.
     
    JKBob 25, May 11, 2017
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  12. May 11, 2017 at 8:08 PM
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    OFFGRID

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    OFFGRID Well-Known Member

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    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    OFFGRID, May 11, 2017
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  13. May 12, 2017 at 6:53 PM
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    JKBob 25

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    JKBob 25 Well-Known Member

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    Thanks Peter. Once again....you come through. Thank you.
     
    JKBob 25, May 12, 2017
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