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W204 C220 cdi cranks won't start, cdi showing ignition off?

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Cossie7, May 20, 2017.

  1. Cossie7

    Cossie7 Member

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    Location:
    Lanark
    Your Mercedes:
    2010 c220 cdi
    Hi all,

    As a previous thread for this but it was started on the wrong path so starting a fresh.

    Basically car cranks won't start all rail pressures ok, tried full ecu kit in case was a DAS problem and fitted new front Sam aswell as checked all fuses and relays etc.

    The only thing I can see when reading the ecu with star it shows "cause of engine shutoff - ignition off/the combustion engine was not started" and desired reading should be "no engine stop"

    [​IMG][/URL]

    Anyone have Any idea where to start with this?

    DAS in eis and ecu all show green so something is missing from somewhere?

    Many thanks
     
  2. steveq

    steveq Senior Member

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    Joined:
    Jun 9, 2010
    Location:
    Dublin
    Your Mercedes:
    2011 Merc S212 E220CDI Estate; 2011 Merc W204 C220 CDI; 1965 W113 Merc 230SL Pagoda
    Your battery is showing just 9.9 volts.
    I doubt if that is enough to power the electrical systems and the starter motor.

    Is it the original Battery?
     
    television likes this.
  3. television

    television Always remembered RIP

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    Location:
    Daventry
    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded

    True that is far too low to test thing
     
  4. OP
    Cossie7

    Cossie7 Member

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    Your Mercedes:
    2010 c220 cdi
    Hi battery voltage was fine but that was after many tests that included cranking.
     
  5. L John

    L John Senior Member

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    Location:
    UK
    Your Mercedes:
    W204 C350 Petrol Elegance
    Diesels are not my thing.
    In a diesel engine how is the injection timed?
    My guess is the ecu for injection timing is either faulty or it's not receiving a time prompt to let it know when to power the injector.

    Could be as simple as a bad connection or broken wire with any luck.
    Like I said, diesels not my thing. Hope you get it sorted.
     
  6. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    You do have 12 volt fuses and 4 of then in the ECU4
     
  7. OP
    Cossie7

    Cossie7 Member

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    Your Mercedes:
    2010 c220 cdi
    All fuses in all sam's and front fuse box are fine, also tried swapping relays.

    I didn't know about the fuses in the ecu but I did try a full ecu kit with no change.

    I wonder if it's worth checking the switches earth for circuit 87?

    I just can't see why all DAS would show fine but ecu showing ignition off?

    Thanks
     
  8. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    Mercedes-Benz C32AMG, SL55AMG, C320CDI Sport Edition Estate and SLR McLaren Coupe Roadster.
    Check the fuel pressure on crank at the injector rail. Less than 160bar and it wont go.

    If you have good fuel pressure you need to check the injectors.
     
  9. OP
    Cossie7

    Cossie7 Member

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    Your Mercedes:
    2010 c220 cdi
    Hi all,

    Thanks, getting 300bar on crank so looks like it's injectors.

    Spoke to a diesel place in Glasgow and he wants the full car to check rather than just the injectors which sounds a little strange to me. He says not to remove the injectors yourself as some times they don't work when put back in. It I can't see them been any different to any other common rail?

    Cheers
     
  10. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    Mercedes-Benz C32AMG, SL55AMG, C320CDI Sport Edition Estate and SLR McLaren Coupe Roadster.
    Diesel place is talking bol...rubbish. The only thing you need to watch is the quantity correction programming, they are cylinder specific, so mark the injectors on removal.

    A proper diesel specialist will test your injectors on a bench and confirm their serviceability.

    DTM in Bristol are excellent. Take them out and send to them in the post, they will test and post back.
     

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