E46 330 New MAF and new fault codes!
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  1. #1
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    New MAF and new fault codes!

    Had Motor symbol (yellow) appear, reset with INPA with Bank1, Bank2 amd MAF, a few times. Cause it is unlikely that both O2 sensors would fail at the same time I went for a new MAF (after cleaning did not help). Now with new MAF (From QH not a cheap chinese alibaba .com Piece of rubbish!) I hope? Now the engine light is out but after about 20 mins of driving the yellow brake light combined with the DSC yellow light followed closely by the EML yellow light. Have reset twice and hoped that the MAF would Need to communicate with the ECU and it would settle. But after reading the codes the Idle Control Valve (ICV) is showing as mechanicaly stuck open plus Bank1 and Bank2 codes.

    After googling :-

    1. Idle valve stuck open?
    2. Wheel sensors not communicating with module correctly?
    3. MAF not compatible with ECU (I bought the Thing from a reputable ar parts place using the cars "schlussel Number" which here in Germany is very specific to your cars type and manufacture date.

    Anyone got an idea? (will start with ICV cleaning tomorrow but I find it unlikely that it is stuck as the other warnings are sort of not consistent)
    Last edited by Bratty; 06-12-2017 at 18:20.

  2. #2
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    The fault codes that were displayed were Yellow "ASC", "DSC" and "EML", they would reset themselves when the ignition was turned Off then back On, for about Three times then they would Display again closely followed by the Yellow "Motor Management Light" which stays on and requires to be extinguished with INPA.

    So I stripped out the airbox, MAF, DISA and air ducting to the throttle Body to get Access to the Idle Control Valve (ICV), relatively easy except for the clamps on the lower rubber duct going to the throttle Body and the small one to the IDV itself. They must of been assembled at the factory before the Motor went in as the heads on the clamps are seriously not easy to Access, ended up removing the ICV and having to Twist the small rubber duct to get to the head which enevitably after 14 years meant it split! New one was cheap (under a tenner from BMW) and to be honest if you are going to do this Job it might be prudent to pre-order one.

    Once the ICV is removed you can test it by rotating in your Hand rapidly and the valve inside should be free to rattle back and fore , mine was sticking so just freed it up using brake cleaner and a cotton-bud. After rebuilding (locating the clamps on the lower ducting so that they can be installed/removed in the future without having to damage the duct) reset all the codes using INPA and did a Long test-drive. Happy to Report "No More Codes".

    Still find it strange what the ICV sticking has to do with "DSC" and "ASC"
    Last edited by Bratty; 06-12-2017 at 17:39.

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    PAYNO (14-12-2017)

  4. #3
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    So just an up-date!

    Fault was not resolved, ended up changing the CCV without removing the intake manifold (which everyone who has done it will agree that it is a bit of a pain in the ass!) also cleaned the throttle Body as it has to be removed to do the Job. On inspection the throttle Body has a hair line crack on the housing around the shaft of the Butterfly valve. The Butterfly valve did seem to be a bit sticky when pushed to the closed Position so freed it up with brake cleaner (not a good idea to move the valve too much as it can mess-up the calibration Alledgedly!).

    Car now runs without Warning lights and no faults on INPA .

    So Conclusion (in Hindsight)!!, If your car starts throwing up EML and/or Motor Control Light and you have no record of the CCV being changed (and the CCV pipe to the rocker cover is brittle through Age) then just bite the bullet and Change the assembly! While you are doing it you can clean the Idle Control Valve, the Throttle Housing and the MAF and hopefully you will have an e46 that will run happily!

    P.S: If you run the engine without the ICV plug attatched then you will get the ASC, DSC and EML light come on, so it must be the reason for the indications I had with the new MAF!?! as the signals from the throttle Inputs on the throttle Body electrics and the ICV were being affected by the CCV valve being blocked and the New MAF was not as good as the original one??

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  6. #4
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    Having replaced my CCV too Dunk I can definitely confirm it isn't a job you'd like to do a second time is it

    Great advice for those with similar symptoms, I suspect most workshops would just keep replacing the faulty parts that flag up in the error code descriptions , finally replacing the ccv once every other linked component has been exhausted!


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    Bratty (11-01-2018)

  8. #5
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    At the end of the day INPA is a "tool" and the info it gives is fairly accurate BUT! A tool is only as good as the Person using it!

    When a Non-Electro/mechanical monitered System is defective then you have to apply good old fashioned "Common Sense!" or "Good advice from a good Internet Forum like WWW.BMWFORUMS". Shame the peeps that use the advice are not more appreciative

    Still Hurts when you Learn the Hard Way and systimatically pay for new parts (which aint cheap) but hopefully my experience on this matter will help others in the future.
    Last edited by Bratty; 15-01-2018 at 17:59.

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