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Thread: difference in DME's ?

  1. #1
    Join Date
    Sep 2018
    Location
    Belgium
    Posts
    307
    My Cars
    1990 850i and 1970 2800C

    difference in DME's ?

    i came across this link here on the forum , which indicates that the x....x352 DME's 1 and 2 should be different ? Can someone explain what it could be ?
    https://www.bimmerforums.com/forum/a...0&d=1322067057

    is it the DME itself ? because when we compare chip mapping , they seem to be exactly the same… or they must have been changed by PO.
    Last edited by Belgiumbarry; 10-12-2018 at 01:47 PM.

  2. #2
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    54,654
    My Cars
    11/88 E32 750iL+98 E36M3
    The DMEs are identical, so are the chips, and it does not matter what you swap, harnesses, boxes, or chips. If I remember right, the only difference between DME #1 and #2 is that pin 85 is grounded on the #2 box so the diagnostic software or the stomp test can tell the two apart. The xxx156 DMEs were used on early E32/E31 M70 with Bosch M1.2 Motronic systems. Later E32 750 used the same 352 DMEs as the e31 850 with M70 with M1.7 systems.
    See the ETM pinout.
    Shogun tricks and tips for the E32 series are HERE!

  3. #3
    Join Date
    Sep 2018
    Location
    Belgium
    Posts
    307
    My Cars
    1990 850i and 1970 2800C
    thanks alot shogun for info !

  4. #4
    Join Date
    Nov 2015
    Location
    Ger
    Posts
    29
    My Cars
    E31 850iA 1992
    I have read out my original M70 850i automatic DMEs. The EPROMs are different. (i dont remember how many bytes)

    Ich have a second pair of DME: 750i 09/90-11/91.
    These EPROMs are also differnt. 6 Bytes.
    See the pricture. (there are 12 Bytes different -> file ist doubled/stacked, because the EPROM ist double size to the bin data)
    HEX - DEC
    7F - 127
    80 - 128
    81 - 129

    Car runs also fine with equal EPROMs.
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    Last edited by E31 850i; 10-13-2018 at 07:13 AM.

  5. #5
    Join Date
    Dec 2006
    Location
    Sunny Cali,
    Posts
    8,730
    My Cars
    6.5 second 69 Camaro
    If they are placed in either slot, They work the same.

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