E34 530i V8 MAF issue.

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  1. E34 530i V8 MAF issue. 
    #1
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    Sam530iV8's Car Details
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    Hi guys!
    I'm new to BMW ownership and after driving my brothers E36 i thought i'd get one to replace my previous car, i tend to buy cheap cars and keep them going for a few years.

    I bought a 1993 E34 530i V8 touring manual, i got it for a bargain price of £500 and was aware of 2 functional faults whilst buying, namely rear shocks as the current ones don't really function at all and, bizzarely, the connector to the MAF had been chopped off by the fan, i'm guessing the only way this happened was someone leaving it unplugged as the cable would have been far too short to catch and they are usually very secure.

    Anyway, drove it home 100 miles in limp home mode, combined with the suspension made for an interesting journey i can tell you.....

    This is the mess i have to deal with: (cleaned up slightly)



    Now, before driving i of course seperated all bare wires and insulated them, however the previous owner had not and of course during the fan chop some wires touched.

    I noted some welding of the 2 shorter, fatter wires (no doubt including the 12v supply to the MAF) and melting of the surrounding plastic sheathing.
    Thankfully the 2 longer wires, which i presume are the more critical sensor wires do not seem to have made contact with the power wires (although they may have done briefly previously, or touched each other)

    My questions are,

    -Does anyone know the coresponding wiring between the MAF plug and the wires i have? ( i am currently trying to source a replacement plug from a scrapped BMW, bit of a wild goose chase so far)

    -I have no doubt the MAF is fine (the plug must have come off before the chop) but i am concerned that the ECU may have suffered damage from shorting, which wires are the critical ones here, i'm hoping the longer ones are the critical ones and they havn't had 12v down them at any point.
    I know that ECU's can survive some abuse, i guess i won't know until i fix the MAF.....i don't have any diagnostic equipment i'm afraid.


    Any help is greatly appreciated,

    Sam.
     
     

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    #2
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    Pin 1 - Brown wire - earth
    Pin 2 -Grey/yellow - ECU
    Pin 3 -Red/brown -12v Feed
    Pin 4 -Grey/Blue - ECU

    You might need to get a decent pic right down the barrel on the plug on the air flow meter to find out which pin is which.

    http://www.bmw-planet.com/diagrams/r...8old/index.htm
    If you follow this,
    Choose components>
    component information>
    X, Connectors, terminals>
    x5001-8000>

    and go to X6217

    That's a pic of the missing plug, try to spot the triangular posts round the outside, and Pin one will be next to this.

    REMEMBER - THIS IS THE PLUG VIEW, NOT THE MAF VIEW!!!!
     
     

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    Sam530iV8 (08-07-2010)

  5.  
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    Ta mate! good to see i was right with the cables, that was pretty miraculous the two ECU wires stayed long and free of the 12v.....

    Oh and i've just sorted the problem of not having a replacement connector....
    Earlier i went to the scrapper and came away with the wrong connector (it looked the same externally but had different internal shape) just fished it out the bin and modified it with a file, fits perfect! just needs to be secured somehow...
     
     

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    Right, for some reason that WDS isn't working depsite allowing/installing the activeX etc etc, i can't see the diagrams in the box on the left..

    And i think i'd have a problem getting the correct orientation of the plug anyway considering i have made my own.

    Would anybody here be able to work out which wire goes to which pin on the MAF, as you see it in the picture i posted.

    I may wait till i see my brothers E36 (which has the same MAF plug) but i'm not sure he'd be too keen on my peeling back the insulation on his lead to have a gander at the cable colours!
     
     

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    Check it matches, the WDS only covered the 740i, but it should be the same connector
     
     

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    Sam530iV8 (08-07-2010)

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    Hmm, that's tilted at 45 degrees to what i have, which pin on here would correspond to the top pin on the connector?

     
     

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    Sure is... Hold the phone..
    The pin assignments will most likely be the same, but it's still tracking down Pin 1...
     
     

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    Meh, i'll have to wait to see my brothers lay out, his is horizontal like mine.

    I'll let you know how i get on.
     
     

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    Yep, i've got another old manual for a '93 740 but i can't find the proper connector name.
     
     

  14.  
    #10
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    Brothers e36, same connector.......different airflow direction on the MAF! so i'm not gonna trust that to indicate pin numbers. (the MAF could simply be upside down same version of mine, hence inverting the pins)

    According to his pin 1 is bottom left on the MAF plug.
     
     

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