2003 E46 318TI Compact - Wont Start Can't Access DME

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  1. 2003 E46 318TI Compact - Wont Start Can't Access DME 
    #1
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    The summary is car wont start.
    E46 318ti Compact 2003 with N42 engine.

    When I turn on the ignition the temperature sensor goes to max and stays there. The car cranks but doesn't fire up.

    I've installed INPA with a modified VAG com lead and also run BMW scan demo v 1.4. Neither can detect the DME. I'm getting IFH-0009 from INPA when I try to run engine diagnostic. Other modules are accessible: DSC, radio etc.

    I'm going to install DIS v44 and see if that tells me anything more but expectations are low.

    The car has previously fried another DME so I suspect it may have done the same again.

    Any thoughts on how to proceed most welcome.
    Also looking for service manuals for E46 compact.
    Last edited by mark@vorny.co.uk; 19-08-2010 at 01:03.
    car: 318ti E46 compact 2003
     
     

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    Can anybody assist the OP?
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    So I've managed to get INPA and DIS up and running with a modified VAG COM cable.
    Unfortunately the car still wont start. The dreaded 2737 EWS3.3 anti-tampering protection incorrect random code. Any thoughts welcomed but possibly needs a new thread.
    car: 318ti E46 compact 2003
     
     

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    What was said to be the cause of the last DME frying?
     
     

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    you need to align the EWS with the ECU. Not too sure if you can do it on that ecu, look through you special options menus etc, as i think that code is just saying your ecu isn't the one the car came with.
     
     

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    Reason for demise of previous ECU unknown - couldn't get the diagnostic out of it for obvious reasons. The garage just returned the working car and I didn't think to ask about the cause.

    I have got an option in DIS: 6 ALIGNMENT EWS-DME

    This definitely sounds plausible but I'm worried about killing one or both of the DME/EWS. Then again I haven't exactly got a lot to lose.
    car: 318ti E46 compact 2003
     
     

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    Here's the latest info:

    The summary is car wont start.
    E46 318ti Compact 2003 with N42 engine.

    When I turn on the ignition the temperature sensor
    goes to max and stays there. The car cranks but doesn't fire up.

    I've installed DIS (separate thread now closed - thanks Davis Mc) and got the following:
    279A Throttle actuator - relearn abort - fault in repeat stop learning
    2792 Throttle actuator - position monitoring - throttle positional variation (light)
    2737 EWS3.3 anti-tampering protection incorrect random code (no light)
    2782 Camshaft sensor exhaust (phase flanks or installation position outside tolerance - no light)


    Some other symptoms:
    * when turrning on the ignition the engine temperature goes to max and the dsc light is on.
    * then some relay buzzing and the EML and engine light come on and the DSC goes off.
    * occasionally it flips between these two modes

    My thoughts on next steps:
    * inspect crank sensor(s) looking for any cracks, oil or any other obvious issues.


    So after a few more frustrating hours I'm no further forwards. The only persistent code is:
    2737 EWS3.3 anti-tampering protection incorrect random code

    There's also a IHKA:
    19 Auxiliary Water Pump short circuit to negative.

    But I doubt this has a lot to do with anything. In any case I have removed fuse 28 and un plugged the pump (which I noticed was getting very hot with the ignition turned on).

    Another strange symptom: the DME connectivity to the CAN bus seems to oscillate and more often than not it's not connected (no EML or engine shaped light they come on for a few seconds then go off). The only way to keep the DME "switched on" was to use jump leads hooked up to the mondeo. The DME is then reliably accessible but the thing still wont start. The EWS error keeps coming back with assorted cam/crank errors which then disappear once cleared but EWS persists consistently after cranking. My thoughts are that for some reason the immobiliser is not switching off and a drop in voltage is compounding the EWS problem. I've replaced the battery but the magic eye on the old one still shows green. I've also used a battery charger when diagnosing but it's not as effective as the mondeo+jump leads. I've heard the fuel pump running and used DIS to activate it in test mode. I haven't done a spark test (I would need a few pointers here).
    car: 318ti E46 compact 2003
     
     

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    First thing I would do if you have no comms and a non start is check the powers supply and earths to the ECU. You will have a constant positive and an ign positive to the ECU and various earth paths. If any of these are broken you would lose dignostic communication, and a non start...
    I would be looking for a poor earth somewhere with a fault like this. The jump leads are giving your ECU a path to earth.

    Also, as mentioned above. If the ECU is from a different vehicle, the EWS will not be matched....
     
     

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    The new ECU was re aligned and it worked fine for a few months.
    I'll check the power and earth connections to the DME and revert.
    Thanks for the pointers.
    car: 318ti E46 compact 2003
     
     

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    Ok more info.
    I tested the power to the DME. 1 red (always +12v), 1 red/white (think this is the ignition) no power even with ignition on (at the point of measurement the car was oscillating but more off than on). 2 brown - resistance to earth 0.6 ohm. So my next move is to try to confirm whether the voltage on the r/w is oscillating in time with the EML/engine light (it was raining hard so I spent time inside the car). I did manage to cleardown the EWS fault by resending the start code (although a flat laptop battery has prevented me from reconfirming this - agin rain stopped play). More updates when I get a chance...
    car: 318ti E46 compact 2003
     
     

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