+ Reply to Thread
Results 1 to 5 of 5

Hybrid View

  1. #1
    Registered Member
    Location
    , ,
    Member No: 56564 jimcob is an unknown quantity at this point jimcob's Avatar
    Join Date
    Nov 2002
    Posts
    5
    Rep Power
    0


    Yes | No

    Diagnostic not working on M3 E36

    Hi!

    I need your advice with the problem I'm facing with my M3 E36 Euro.

    The car has a loss of power specially in low revs, with a hesitation when trying to accelerate, and allot of exhaust fumes.
    I took it to a BMW workshop, and when the technician connected the diagnostic system (Modic) there was no communication with the ECU, so he could diagnose.
    Do you have any idea of what it may be wrong?

    Thank you in advance,

    Best Regards,
    Dimitri

  2. #2
    Registered Member
    Location
    Lexington, KY, United States
    Member No: 81720 adsingl is on a distinguished road adsingl's Avatar
    Join Date
    Jul 2003
    Posts
    449
    Rep Power
    13


    Yes | No

    Re: Diagnostic not working on M3 E36

    Sounds like it's probably one or more coils. they can be removed and Bench checked for resistance values.
    On the OBC port under the hood, sometimes pins get pushed down or the connector doesn't make a good connection. Get some q-tips, wrap some fine 400 or 600 grit sanding paper around it, and mildly clean the pins/holes, then get some rubbing alcohol and clean with that. Inspect the pins to make sure none are pushed out - but I'm not sure if any are recessed on purpose from the rest - best to look at another E36 to make sure.

    This forum is pretty dead, try M3forum dot net or b i mmer forums dot com (remove spaces and . replaces dot) for more user traffic and answers.

    ADS

  3. #3
    Registered Member
    Location
    , ,
    Member No: 56564 jimcob is an unknown quantity at this point jimcob's Avatar
    Join Date
    Nov 2002
    Posts
    5
    Rep Power
    0


    Yes | No

    Re: Diagnostic not working on M3 E36

    Thank you for your reply.
    I will follow your instructions and clean the pins/holes.
    After searching on the web I found also this explanation from a BMW expert:

    sometimes some module pulls down diagnosis bus and you cannot diagnose your car at all.
    to find out which module it is you have to disconnect all modules one by one and try to diagnose your car. when diagnosis bus starts to work you have found your problem.
    ecu
    central locking module
    airbag
    abs
    speedo
    automatic gearbox module
    ews
    and so on

    i do many diagnostics on engines ( 20-40 cars in week) and sometimes have this trouble. when i am in a hurry i just disconnect white yellow and white purple wires from connector that connects engine wiring harness to car main harness and i can work with ecu.in older cars its 1 car from 20 that has this problem.
    disconnecting these wires will not help you to diagnose your airbag problem so you have to go through this module disconnecting procedure.
    other way is to cut these wires just after diagnostic connector, cut them next to airbag module and connect diagnostic connector wires directly to airbag diagnostic module wires.

  4. #4
    Registered Member
    Location
    , ,
    Member No: 17062 JKRIT is on a distinguished road JKRIT's Avatar
    Join Date
    Oct 2001
    Posts
    2,203
    Rep Power
    17


    Yes | No

    How old R the oxygen sensors?

    Bad O2 sensors can also cause the symptoms U described, even without setting of the CE light or throwing a code. U really only need to change the pre-cat ones (if they are bad); The post-cat sensors are just monitors and will not make it run badly.

    Mass Air Flow sensor is another possibility.

    It is had to determine what is wrong without being able to read the codes. These are two that come to mind.
    '01 325it Steel Blu./Blk
    '98 323is Arctic Sil./Blk, SP
    '97 528i Montreal Blu./Grey
    '95 M3 Cosmos Blk./Blk

  5. #5
    Registered Member
    Location
    , ,
    Member No: 56564 jimcob is an unknown quantity at this point jimcob's Avatar
    Join Date
    Nov 2002
    Posts
    5
    Rep Power
    0


    Yes | No

    Re: How old R the oxygen sensors?

    Thanks for your post.
    Both sensors are new.. my problem is that I cannot find out what causes the error in communication between the ecu and the diagnosis..

+ Reply to Thread


Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

     

Bookmarks

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
1e2 Forum