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do these Longitudal Accelation figures look suspect....

Discussion in 'A3/S3 Forum (8L Chassis)' started by thegoal007, Feb 28, 2011.

  1. thegoal007
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    thegoal007 Another S3 owner....

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    [Feb 28, 2011]
    Posted the below on another thread, but maybe people have not picked up on it.

    Just took some logs whilst just crawling out on full lock and noticed that group 4 logs, the lateral accelaration figures range between 0.1 to -0.27.
    The strange one is group 6 logs, Longitudal Accelation ranges between
    0.097 to 1.84 - BUT there are few times it jumps between 24.03 to 24.8.

    Does that sound abnormal and does anyone know what that means ?

    As both of those units feed signals into the Haldex unit for it to translate into an action, then by removing the Haldex fuse (no.31) does it mean the figures are ignored by the haldex. ?

    Although it may sound obvious, I'm not 100% sure by removing the haldex fuse you are preventing the haldex from working in every apsect of it's job.

    Anyone with detailed knowledge ?


    #1
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  3. finesse
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    finesse Active Member VCDS Map User

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    [Feb 28, 2011]
    Mine says 25m/s when stationary - it is faulty

    According to rosstech :


    Check field 1, the value has to be between -1.5 and +1.5 m/s².
    #2
  4. thegoal007
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    thegoal007 Another S3 owner....

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    [Mar 1, 2011]
    What problems do you experience , if any ?
    #3
  5. thegoal007
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    thegoal007 Another S3 owner....

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    [Mar 1, 2011]
    scouring the internet for more info I came across a forum post of another S3 owner who had a similar reading to you and I quote.......

    "i replaced the acceleration sensor with one from my tt and after clearing the DTCs
    it still makes the clicking sound but the reading in the basic settings is now 21.725
    instead of 24.520"


    So sounds like perhaps replacing it may not be the answer for you.
    #4
  6. superkarl
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    superkarl MAN OF STEEL

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    [Mar 1, 2011]
    i had readings of 20 something, and also esp light and abs light, after replacing the longitudinal sensor the abs dissapeared, however i dont recall what the readings were afterwards, doh.
    what i am led to believe by an audi tech is that they need to be calibrated after fitting, i didnt do this.
    #5
  7. thegoal007
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    thegoal007 Another S3 owner....

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    [Mar 1, 2011]
    Yep, I heard and read that too, but it seems a lot of people do not bother and it is still fine - just as you have ntoiced.
    Checking on rosstech web site this is what you do to calibrate....
    [Select]
    [03 - Brake Electronics]
    [Coding-II - 11]
    Enter 40168, to enable the basic setting.
    [Do it!]
    [Basic Settings - 04]
    Group 069
    [Go!]
    Activate the Basic Setting.
    [ON/OFF/Next]
    After a successful basic setting, field 2 should say "OK".
    [Done, Go Back]
    To make sure the basic setting was succesful, check the sensor again.
    [Measuring Blocks - 08]
    Group 006
    [Go!]
    Check field 1, the value has to be between -1.5 and +1.5 m/s².
    [Done, Go Back]
    [Close Controller, Go Back - 06]
    #6
  8. finesse
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    finesse Active Member VCDS Map User

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    [Mar 1, 2011]
    occasional ABS & TC light, can't be calibrated if its f$%*led. possible to remove and check & clean sensor
    #7

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