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  1. #1
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    How hot does an ECU get?

    My car has a fault code 2F71, which Google says is: E-box-fan, input signal
    I'm not sure if I had this problem for long, because before I put in the JB4 I had no means of reading fault codes, and I'm just able to read fault codes since I uploaded the new HEXfile (that Terry send me) just 2 days ago. Before that the speedo readings were off.

    So I think it implies the fan that should cool the ECU is either not working or not sending rotation control signals to the ECU.
    Possible causes as far as I can think of:
    1. loose connector (I $#@!ed up putting the ECUbox back together) Anybody know which connectort I should look for?
    2. Blown fuse Again, does anybody know if this fan is protected by a fuse? and which one?
    3. broken fan. That's the least likely cause IMO...

    If it's more than a blown fuse I won't be able to repair it for at least 3 weeks...
    The agenda is all sceduled full with things to do Click here to enlarge
    Will this driving without cooling of the ECU put me on the side of the road with an overheated ECU?
    The weater here is -3C in the morning, and +7C in the afternoon...
    Thanks for your answers!
    There are two theories to arguing with women. Neither one works

  2. #2
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    bump to help him out

  3. #3
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    Gets pretty hot, I'd get the cooling fan fixed if its not working!

  4. #4
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    Thanks Terry.
    How can I check if the fan works at all?
    Preferrably without removing the ECU cover...
    There are two theories to arguing with women. Neither one works

  5. #5
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    Can't help you on that. Click here to enlarge Check realoem for a photo of the ECU box. The fan sits under the glove box area.

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    Ok, the car is parked until I get this resolved.
    I do NOT want to end up with a fried ECU.
    I make some time this friday to do this. This has priority over allmost anything.
    I hate to drive around in my wife's Jazz if I do not have to.
    There are two theories to arguing with women. Neither one works

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    In case anyone wants to know just how serious of an issue this is, a jazz is this:

    Click here to enlarge

  8. #8
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    O god, do they really exist in that color Click here to enlarge
    But yes the shape is the same..
    There are two theories to arguing with women. Neither one works

  9. #9
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    Grrr, this is not going as planned.
    I did not find anything wrong inside the ECU box.
    Starting the engine, then clearing the code does not produce the code again, until I completely power down the car. Only after power down restart does it produce the code...
    Next thing, clear code, remove JB4 and start engine. After that reinstall JB4 and check for codes...
    10 min almost over to start doing this...
    Can not find any fuse that would protect the fan...
    Suggestions are welcome.
    There are two theories to arguing with women. Neither one works

  10. #10
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    Update.
    After ruling out the JB4 as part of the problem I removed it from the car and drove it to the BMW quick service. There they concluded that the fan really has broken down, and that it needs replacing. There should have been a fuse for it in the DME box but they could not find it.
    Because the car is 3 months out of warranty they will repair this under coulance, so I will hear what this will cost later.
    Apparently this fan is so tucked away behind the fusebox that it will take 3 to 4 hours to repair this.

    So in retrospect I am really lucky I got the JB4 when I did!!!
    I would have never found out that this fan malfinctioned without this tune and its ability to read fault codes.
    Not until the DME would have overheated.
    Also lucky the car didn't fry the DME with the J4 still connected. It could have been an expensive one then...

    Driving to the BMW service center and back without the JB4 really was an eyeopener.
    I allways thought my car was a fast car, but driving without a JB4 when you're just used to one just makes the car feel really SLOW!
    I can hardly wait for the car to be fixed so I can reinstall the JB4.
    I Would never want to drive without it again!
    There are two theories to arguing with women. Neither one works

  11. #11
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    First time I've heard of this type off failure but glad you were able to find it before more damage was done! Click here to enlarge

  12. #12
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    So am I ! Even at the BMW dealer where I was they never had this failure... And that's a fairly big BMW dealer (and Alpine importer for all of Holland).
    Just my luck.
    O well, could be worse.
    There are two theories to arguing with women. Neither one works

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    Just bad luck, but glad you found out what it was and that the dealer is fixing it.

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    Shoot, I'm a bit late for this. Sorry. The e-box fan crapping out is very common. Most people never know because it does not set off the service engine soon light. The fan is inside the car and takes cold a/c from inside the vehicle and circulates it through the e-box. Very easy to change.

    Glad you fixed it though.
    BMW Master Certified Tech - ///M Specialist & Diesel Specialist
    - '02 BMW 530i/5 speed - 596WHP/558FT-LBS @ 22 PSI, E85 PTE6262
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    Thanks DLV. That makes me feel more like I'm not alone with this problem.
    Do you have any idea where the fuse of this fan is located in a 135i?
    The mechanics at the BMW shop couldn't find it in the DME-box, where it should have been according to their database. And god knows they plucked the DME box inside out. I was there...
    There are two theories to arguing with women. Neither one works

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    Click here to enlarge Originally Posted by DavidV Click here to enlarge
    Thanks DLV. That makes me feel more like I'm not alone with this problem.
    Do you have any idea where the fuse of this fan is located in a 135i?
    The mechanics at the BMW shop couldn't find it in the DME-box, where it should have been according to their database. And god knows they plucked the DME box inside out. I was there...
    I believe the fuse for that is kinda hidden persay, BMW unfortunatly has wiring diagram issues, somethings missing, some things added which it doesn't have etc. I haven't been able to find the fuse myself either, quite frankly, I don't think it even has one since no one could find it. Could be a mistake from BMW. Usually if I can't find a fuse(which is rare) I check to see if I have power at my control unit/part/light ETC and the correct amount, I know the fuse is ok or circuit is ok.
    BMW Master Certified Tech - ///M Specialist & Diesel Specialist
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  17. #17
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    Follow Up:
    The fan was replaced.
    For this to be done the entire rightside and center part of the dashboard had to be removed
    This was a one and 3/4 hour job.
    Click here to enlarge
    If you're real carefull with your car and faint hearted you better not watch anyone tearing the interior of your car apart like that Click here to enlarge
    Anyways, the part was replaced in the end.
    Click here to enlarge
    Last friday I reinstalled the JB4.
    Click here to enlarge
    And you know what, no more fault codes Click here to enlarge
    There are two theories to arguing with women. Neither one works

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