Question about BMW 545

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1999 540 BMW no communication between ecu and alarm computer starter will kick in but no spark fuel or injector pulse will get to the engine any ideas? thanks

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How did you verify this lost communication, do u have a code i can troubleshoot? if not please test the system for fault codes with a scanner, otherwise we are flying blind here.

Posted on Jul 06, 2010

  • Fausto Artiaga
    Fausto Artiaga Jul 07, 2010

    s that was not signs of water inside the car the engine was done and put back in the car.
    at first that was no start no cranking nothing there were a few codes in the computer but I guess old codes
    I could not get in the emissions part of the computer,no communication on emissions air bag and body, communication on abs air conditioning and trans.
    after some research I found out the power distribution box under the passenger seat was bad ,replace it and now I can get cranking but no fuel no spark no injector pulse.
    the no communication comes from a trying to reprogram the key to the car and "align" computers.
    the next step will be cheking all grunds and power to the ecu before replacing it?
    or not?
    help




    thanks

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