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ECU or transmission problem??

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Shaqsdad, Nov 16, 2010.

  1. Shaqsdad

    Shaqsdad New Member

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    Nov 16, 2010
    Location:
    LETCHWORTH GARDEN CITY, HERTS, ENGLAND UK
    Your Mercedes:
    C200/ 1996/ 1998CC PETROL AUTOMATIC
    I had a problem with my Automatic 1996 C200 which was diagnosed as my ECU. The ECU got repaired (at 1st it was only firing on 2 cylinders, that got repaired and then only 2 injectors were working and that got repaired as the ECU repair is under 1yr warrantee).

    On repairing the ECU the rev counter stopped working, but now car seems to be under fuelling (and stutters as well as won't idle without juddering or cutting out if engine isn't warm) and overfuelling (high revs). In addition it drags itself from 0-20 as it acts as if there is no power then all of a sudden jerks into action. It doesn't seem to change gear at convenience (i have to take my foot off the accelerator pedal then step on it again to change gear!!

    Diagnosis says transmission is the problem. Is this related to the ECU? If so should i send it back to the repairers or is it transmission that is external to the ECU?? Any advice will be greatly appreciated.

    MB's are normally a joy to drive and this is my 3rd after having 2 190's, but this is getting to be quite tiring now
     
  2. dieselman

    dieselman Senior Member

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    Your Mercedes:
    A diesel
    I wonder if either the ECU repair is faulty or the wiring loom is breaking up so creating spurious signals and short circuits.
     
  3. television

    television Always remembered RIP

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    Daventry
    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    It does rather sound as the above is the problem,,do you have a good indie near you
     
  4. OP
    Shaqsdad

    Shaqsdad New Member

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    LETCHWORTH GARDEN CITY, HERTS, ENGLAND UK
    Your Mercedes:
    C200/ 1996/ 1998CC PETROL AUTOMATIC
    Dieselman and Television, thanks for the advice

    The indie I use did a diagnostic after getting the ECU back (as it didn't seem right) and it came up as a transmission fault but the rev counter also hasn't worked since they repaired the ECU (don't know if its related?). On slowing down to a stop while driving it judders and makes the exhaust system vibrate and rattle.
    The company that repair the ECU reckon they had run tests on the ECU for over a week and couldn't find a fault since repairing it but the fact that the rev counter still doesn't work since they repaired it makes me feel this could be a relating symptom/indicator?
     
  5. ELGRINGO

    ELGRINGO Active Senior Members

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    Location:
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    Your Mercedes:
    e230 c180 sl280 brabus a190 smar cart
    Hi what system is on the car pms or hfm, pms had problems you can get them repaired th.ough
     
  6. OP
    Shaqsdad

    Shaqsdad New Member

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    Location:
    LETCHWORTH GARDEN CITY, HERTS, ENGLAND UK
    Your Mercedes:
    C200/ 1996/ 1998CC PETROL AUTOMATIC
    Update on my C200 which I'm aptly labelling a "non-mover" now as it struggles to get up to 40mph.

    Diagnostics on plugging it in to the digital machine: it came up with 2 engine codes
    040 - ignition output 1, amperage not reached
    050- transmission speed signal output short to battery positive.

    Battery connections and wirings have been checked obviously, and all in fine working order. So it seems its the ECU that is still faulty as Dieselman initially said, if i'm correct?
     
  7. star

    star Forum Supporter Authorised Forum Supporter

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    Reading
    Your Mercedes:
    Smart + others :)
    Check your plug lead end but I would suspect ecu as above, we have seen many that have supposed to have been repaired but are still faulty, the problem is that they cannot test under load for a long period. we have test ecu's to prove a point.
     
  8. OP
    Shaqsdad

    Shaqsdad New Member

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    Your Mercedes:
    C200/ 1996/ 1998CC PETROL AUTOMATIC
    Before the ECU got repaired we went through the process of elimination by checking the leads and plugs and replacing them with new ones (as the original fault started as the car only firing on 2 cylinders), then the coil pack. So the leads, plugs, and coil pack are all new to a degree.
     
  9. star

    star Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    Smart + others :)
    Deff ecu then:(
     

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