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Thread: Actuator motor

  1. #11
    Join Date
    Mar 2012
    Location
    Burnley
    Posts
    1,092
    See attached picture. This shows the inside of your ECU. The four transistors in the bottom right quadrant make up the H bridge driver for the clutch. It is most likely that one of the two smaller transistors just above the left big transistor of the four is blown but it may be that a pair of the transistors in the H bridge are blown. That would probably be 1 and 3 or 2 and 4. I CBA to work out which, it is easier to just test them and replace what has gone. If you don't knwo what an H bridge is then this explains it quite well:

    http://www.talkingelectronics.com/pr...-Bridge-1.html

    I am only assuming the circuit is one of these from a quick glance at the PCB, I can't think of what else the Krauts may use so it is an educated guess and I am not about to trace the tracks to confirm. .

    Last edited by Mjolinor; 03-05-2017 at 01:08 PM.

  2. #12
    Join Date
    Apr 2017
    Location
    Brierley Hill
    Posts
    8
    Hi is it possible to fit a used ECU to sort out the problem or is it not as simple as that
    Thanks Paul

  3. #13
    Join Date
    Mar 2012
    Location
    Burnley
    Posts
    1,092
    It is possible but not easy.
    You have to remove the EEROM from your ECU and fit it in the replacement.

    It is easier to repair yours. If you are not confident to do it then local TV repair shop could do it if they had instruction about what to test as given in my post.You could post it to me and I will have a look if you want.

    There is always the chance that what I outlined will not fix it.
    Last edited by Mjolinor; 03-05-2017 at 05:32 PM.

  4. #14
    Join Date
    Apr 2017
    Location
    Brierley Hill
    Posts
    8
    Hi many thanks for your kind offer I may take you up on that I do have a friend with a snap on diagnostic tool he says that reads smart cars might get that plugged in to say what that says I'll keep you posted

  5. #15
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    2,983
    A Delphi DS150E can read all systems on your 450. Can be bought for under 30.
    You can clone an ECU.
    http://www.evilution.co.uk/index.php...rical&mod=1214
    Drives a Smart Cdi - 65 to 85 MPG

  6. #16
    Join Date
    Apr 2017
    Location
    Brierley Hill
    Posts
    8
    Sent you pm

  7. #17
    Join Date
    Apr 2013
    Location
    the Netherlands
    Posts
    206
    Get an used ECU with the same partsnummer and check its for the same fuel as your car has!
    When fitted , only thing to do is teach-in the carkeys

  8. #18
    Join Date
    Mar 2012
    Location
    Burnley
    Posts
    1,092
    Keys are not stored in the engine ECU

  9. #19
    Join Date
    Jan 2015
    Location
    Devon
    Posts
    24
    Quote Originally Posted by ossy View Post
    Get an used ECU with the same partsnummer and check its for the same fuel as your car has!
    When fitted , only thing to do is teach-in the carkeys
    ECU, SAM and clocks are all tied together, you can't replace just one of them with a second hand part without some relatively complex operations (swapping/cloning EEPROMs). This is why you regularly see all three modules plus keys being sold together.

  10. #20
    Join Date
    Apr 2013
    Location
    the Netherlands
    Posts
    206
    @Mjolinor and Mikerj.
    Do you have a MB Star diagnostic computer (clone)?
    If so , try fitting a used ECU !
    Only thing to do is teach the keys (F2 ,ect no need for Tancode calculator!

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