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Help please with intermittent starting problem CLK W209 220CDi

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by jrapple, Nov 11, 2012.

  1. jrapple

    jrapple New Member

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    Joined:
    Nov 11, 2012
    Location:
    United Kingdom
    Your Mercedes:
    CLK 2005 220
    Here’s hoping someone can point me in the right direction with this:

    Always starts if left for a few hours/overnight.

    When fault is present, No cold start, Run Flat Indicator unavailable!, Radiator fan runs at full speed and starter will not turn, also my basic code reader will not connect.

    Same fault with two keys, but will decide to start randomly, sometimes second turn other times two hours later.

    I have wiggled wires and swapped like for like relays in the front SAM and often it will start but cannot pinpoint the fault.

    An old invoice from the previous owner shows this fault was rectified with a tin of contact cleaner in 2009!

    I have also checked the earth point on the O/S strut top.

    I have yet to check voltage on fuse 53 and 54.

    How do I get the cover / Plug off the ECU in the SAM box?

    Any help will be greatly appreciated.
     
  2. television

    television Always remembered RIP

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    Joined:
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    Location:
    Daventry
    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    This is a known fault but I cannot remember what it is, hopefully some will come on that knows it
     
  3. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    Location:
    Bristol/Somerset
    Your Mercedes:
    C220CDI AMG Line Premium, SLR McLaren Roadster, SL55 & C32AMG
    Normally when the engine fan runs flat out for no reason it has lost communication with the engine control module and the drive authorisation procedure cannot be completed.

    It is possible you have a failing/failed front SAM unit.
     
  4. OP
    jrapple

    jrapple New Member

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    Your Mercedes:
    CLK 2005 220
    Update:

    Bought myself a Chinese Multiplexer and changed the front SAM, fault still present.

    I cleared all the fault codes.

    When the car won’t start:
    I get B1036 in SAM-F (5.5v at Connector 18, Terminal 61)

    also I cannot connect to CDI_UP (Warning Earlier programming was not performed completely and successfully)

    However when the car has cooled I can connect to CDI_UP and no faults or info is stored. I have completed an alternator test from here and that passed.

    Any more thoughts before I send the CDI unit for test possible repair?
     
  5. Mark@RMK

    Mark@RMK Senior Member Authorised Forum Supporter

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    Location:
    Birmingham
    Your Mercedes:
    115CDi Vito
    it will be the ECU

    Changed a load of them!

    If you send it off, expect to get it back with a " We've fixed it charge" and it still do the same thing! There is a mcu on the board which fails but NEVER seen one fixed affectively or at all for that matter!

    Find a Used unit, or buy a new unit from MB! (You will need to send the used ECU to a reputable company for unlocking, or coding :) )

    Mark
     
  6. Angeloj

    Angeloj Senior Member

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    Aug 29, 2011
    Location:
    Norwich
    Your Mercedes:
    W209 CLK270CDI Avantgarde
    That's not gonna be cheap!!
     
  7. OP
    jrapple

    jrapple New Member

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    United Kingdom
    Your Mercedes:
    CLK 2005 220
    Thanks for your help, hope it’s not against board rules but can anyone recommend a reliable company for reprogramming a second-hand unit, will they “copy” my unit so it’s good to go, looks like I can set injectors etc. with my multiplexer. Your help is much appreciated.
     
  8. Mark@RMK

    Mark@RMK Senior Member Authorised Forum Supporter

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    Location:
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    Your Mercedes:
    115CDi Vito
    You could check out my section of this forum maybe?

    Big banner below!

    I can set it up either way. Plug and play or you can code it in, using control unit adaptations and drive authorisation teach in!

    Very easy to do with STAR! No SCN coding or anything else as I leave it inside the data of the ecu!

    Mark
     
    Last edited: Dec 17, 2012
  9. OP
    jrapple

    jrapple New Member

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    Your Mercedes:
    CLK 2005 220
    Fixed!

    After speaking to Mark@RMK I bought a second hand ECU and visited him in Birmingham, He cloned the ECU with data from the failing unit, keeping the identity, mileage and cars history.

    The problem is now long gone and for half the price of a new ECU I have a repaired car and a Star Diagnostics Kit.

    Thanks to all on this forum, if you have electronic related problems I highly recommend mark@RMK.
     

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