Auto box reset

Discussion in 'Engine' started by MarkC250, Jul 19, 2011.

  1. MarkC250

    MarkC250 Active Member

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    Hi All
    I've not been on for a while as the cars been running well and I haven't needed any advice.

    I'm about to change the auto box oil (following the how to on here) and need to know how to reset it afterwards,
    I don't have a handbook so need your help on this.
    The car is a 1999 C250TD Sport with the later switcherble summer/winter box.
    Thanks in advance.
    Mark
     
  2. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    It can only be done on a Star but it is not essential.
     
  3. OP
    OP
    MarkC250

    MarkC250 Active Member

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    I beg to differ, this is something I've already done when I first got the car,
    but I can't find the right info anymore.
     
  4. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    Its it true. It can only be done on a Star.
     
  5. jefrs

    jefrs Active Member

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    To reset the auto box learning memory you switch to position-2 with the throttle on the floor for some time then release the throttle and turn to position-0 but leave the key in and use no electrics for >2minutes.

    But this is not the reset after oil change, in that Olly most probably right.
     
  6. OP
    OP
    MarkC250

    MarkC250 Active Member

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    That's the one I was thinking of, I thought it would be the same one.

    So as I don't have access to a star does it really need to be done?

    Will it do any harm if I just reset the learning memory ?

    Sorry Olly :eek:
     
  7. Stratman

    Stratman MB Enthusiast

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    The 'learning' function of the gearbox is an ongoing process. If you drive it like a nun it will change up early with nice soft changes. If you then drive it like you stole it it will assume there is a new owner who likes to put his foot down and will hold on to the gears longer and give harder shifts.
     
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  8. Bobby Dazzler

    Bobby Dazzler MB Club Veteran

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    The foot to floor in position 2 thing does not reset anything. It just fools the car into thinking you've stolen it and so the autobox adapts to that.

    The same affect can be achieved by a standing start foot to the floor for as long as you dare. More fun too.
     
  9. npuk

    npuk MB Enthusiast

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    But the engines not on, surprised it does anything, how does anyone know it actually does something is this an actual MB procedure listed in their WIS?

    To the OP plenty of independant garages in London with STAR you can have it reset at if you wanted it done.
     
    Last edited: Jul 19, 2011
  10. Bobby Dazzler

    Bobby Dazzler MB Club Veteran

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    The throttle is drive-by-wire. The ignition being "on" means that the signal is generated and recorded, but obviously doesn't result in forward motion.

    It doesn't work on cars which pre-date drive-by-wire.

    Try gunning it from standstill and you will get the same effect.
     
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  11. rascalmaster

    rascalmaster MB Enthusiast

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    Although I could swear that the 'push pedal down and hold with key at 2' works, guys who know have checked and confirmed that it doesn't actually do anything.
    You need a star if you want to reset the parameters.
     
  12. OP
    OP
    MarkC250

    MarkC250 Active Member

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    Well the peddle down rest worked when I did it,
    before it would be in 5th at 30 and wouldn't kick down untill you gave it a boot full,
    about after it changed as I would expect,
    so I think it works.

    I'm doing the oil change right now, just piped in to check the "how to" on how many L of oil to add before emptying the TC.
     
  13. jefrs

    jefrs Active Member

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    Yes it is more fun but not one for townies.

    You will easily achieve multiples of the local speed limit so perhaps not one to do at the school's zebra crossing.
     
  14. jefrs

    jefrs Active Member

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    Yes it does work but it is not the gearbox oil and service reset.

    There are two things happening with that overtake at 30, the adaptive gearbox and the lock-up top. It should try to stay in top. Plus I do not have a problem with an overtake at 30 in top, it depends on how fast you want to go. It should kick down before it gets to the floor but sometimes top is good enough. Flooring it is a bit OMG.
     
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