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ECU/ABS problems following gearbox replacement

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Humans First, Aug 26, 2012.

  1. Humans First

    Humans First Guest

    Guys

    Any help totally appreciated as I'm in a complete pickle!

    Few weeks ago my 2002 C Class W203 2.7 CDI avantgarde gearbox faield to engage. Engine ticked over fine but couldn't get the gearbox to engage whether manually or auto option.

    Took to local independent who had the box oil checked out for presence of coolant which came back negative. Opted to go for full gearbox and torque convertor replacement (recon with 12mth gtee)

    Took to S-Y motors in Birmingham Uk who fitted recon box but now they say there is an electrical problem with the ABS control unit/ECU. They sought help from Merc dealership who ran check and advised ABS/ECU was malfunctioning so they sent the ECU to ECU testing in Derby who advised there was actually no fault with the ECU.

    S-Y have now arranged for a specialist electrical engineer to help them diagnose and fix.

    I'm not exactly sure what the problem with the ABS/ECU is..S-Y haven't really explained that in detail. I think the ABS/ECU lights come on and in some way restrict the car speed but don't quote me on that.

    I'm worried that S-Y will try and claim the ECU/ABS problem was not of their making and was a problem prior to the refit - potentially even claim the ECU/ABS problem was the true cause of the transmission failure. Is this possible? Could an ECU/ABS problem be caused by transmission/gearbox failure?

    I'm obviously going to need to negotaite with S-Y at some point and don't want to get into discussions in complete ignorance of facts etc so any help would be appreciated.
     
  2. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    The ABS signal comes from the 4 wheel sensors, the front are also the speed signal and the gearbox needs a speed signal. It is impossible for a missing ABS or speed signal to damage the box, it would just lock up into second gear.

    A test on Star should show up what has been disturbed when they were doing the gearbox, I would imagine its just a wire off a sensor
     
  3. Mark@RMK

    Mark@RMK Senior Member Authorised Forum Supporter

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    Your Mercedes:
    115CDi Vito
    Tell them to take it to Mainly Merks


    Mark
     
  4. OP
    Humans First

    Humans First Guest

    Latest is they have re-installed another gear box/torque converter and checked all connections but still, when the car hits 50/60 MPH there is a fault registering on the computer they are using as part of thir testing. Apparently the fault only last for a couple of seconds and is hardly noticeable to the driver but SY don't want to let it go as they have to provide a warranty for the gearbox. They are convinced the problem is the ECU, despite ECU testing confirming the ECU is working fine. Next step is to install another ECU to see if that resolves the issue. If it does I need to fork out £700 for the replacement ECU. Chuffin expensive business this!!
     
  5. Alex Crow

    Alex Crow Senior Member

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    Location:
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    Your Mercedes:
    W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
    I bought a good secondhand trans ECU from Dronsfields for a tenth of that price!
    ESP modules also plug and play on this car, and cheap S/H
    Really no need to go for a brand new ECU on nothing more than a guess.
     
  6. Mickey76

    Mickey76 Senior Member

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    Your Mercedes:
    2003 E320 Cdi S210 145k
    can vouch for this, mine was dead and i lost speed signals, locked box in 2nd but a £20 second hand ecu fixed my problem. couldnt see anything visibly wrong with mine, but all it took to kill it was bridging an abs sensor!.
    let us know what 50/60 mph fault is as mine has always had an issue above 60.
     
  7. OP
    Humans First

    Humans First Guest

    Thanks again to all who have contributed to this thread. Have had an email from S-Y advising the car is fixed now and they have installed a new ABS pump. Not sure why that would have caused the issues so will need to question them and find out the link between the ABS pump and the gearbox. Once I have an explanation I'll post on here by way of reference. If anyone knows why the ABS pump would/could cause a gearbox failure please feel free to post.
     

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