Diagnose for pre-95 E36's (OBD I) - DIY - Page 3

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    #21
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    I don't have a pin 16 on my white connector. I tried hooking up a LED to pin8 on the x20 assuming that the grey wire is (+), and nothing.....is it (-)? Saw a diagram awhile back of how to wire off the DME and it showed how to wire LED....but i can't find it. Please help!
     
     

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    #22
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    Absolutely correct, it's a switch -ve.

    Connect one end to 12v power, into your LED, and then earth it through pin 8
     
     

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    E36Coupe328 (10-10-2010)

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    #23
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    Quote Originally Posted by mistreku View Post
    since my car is a '93 reg car, i haven't really researched this OBD thing, this are just a few things that got into my head along time, so don't quote me on this, but i think both your cars are OBD II. the difference is the ECU programming, the OBD-II are more restrictive and emissions friendly. IIRC, there's no 328i OBD I. also, i think OBD I have no EWS, and for the 6 bangers, the intake is also a clue about the OBD. the free-flow ones are OBD I, the others (M52) are OBD II. basically, all M50 (320i and 328i) bangers are OBD I. also, pre' 95 316i, 318i/is and 3.0 M3 are OBD I as well.
    Above bits I've bolded appear to be contradictory plus I have a June '95 328 which should be an M52 and is OBD1.......... wish it was OBDII really as I coule use generic diagnostics on it then.

    I seem to remember a reference to something like if a certain pin in the 20 pin plug under the bonnet had a terminal in it is OBD-I but not going to put the number in as it's from memory.

    I was going to ask about the idea of using an LED under the bonnet but had been covered.

    Also wondering if cutting the connector mentioned (both sides) from a spare car and joining all the terminals number to number would be a cheap way of making a "break out box"?


    No warranty of any kind implied or given and no liability for any loss, damage or injury, no matter how incurred accepted.

    Free Gas Kit* now fitted to free 328*

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    #24
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    sorry, my bad.. i meant "all M50 (320 and 325) are obd 1". dunno about the 328, but i rekon it should be obd2. regarding the DIY, it's exactly what i've done to my car, and i works perfectly.
    There are only two products required to make the universe work properly: Duct tape and WD40. 


    If it moves (and it shouldn't): duct tape. 
If it doesn’t move (and it should): WD40.

    Everything else is just stuff.
     
     

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    #25
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    That makes sense now cheers.

    I'm thinking maybe add an LED under the bonnet and work the throttle body by hand.



    I seem to remember if pin 15 is populated you have OBD-I can someone confirm if this is correct?

    I would not swear to it, hence no warranty implied or given but if that is a fundamental easy to spot difference when looking at the connector it will be easy for anyone interested to make the choice after a visual?
    Last edited by E36Coupe328; 21-08-2010 at 19:23. Reason: edited pin reference


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    #26
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    I tried this and then realised I don't have pin 8 on the top half of my 20 pin connector, as in there is no wiring in position 8 in either top nor bottom of 20 pin connector.

    is it possible that my 1994 320I uses a different pin?
     
     

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    #27
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    I ran the wire directly to pin 8 on the ECU and still no check light. I found this pin configuration of the e36 ECU on the internet: http://forums.pelicanparts.com/uploa...1236098671.jpg which says the engine check is pin 21, so i wired to pin 21 on the ECU. now the check light comes on and doesn't go out??
    Last edited by Dollso; 23-08-2010 at 18:58. Reason: update
     
     

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    #28
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    You have a fault stored in the memory.
     
     

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    #29
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    OK after lots of messing about and goggling I have discovered that the pin 8 method only works on cars fitted with the Bosch DME M3 unit, not the Siemens Ms40 ECU, as fitted to my 1994 320I, pin 8 on the Siemens unit is the park/neutral switch for automatic cars!

    Also ignore the previous post about pin 21 as that was for a 55 pin ECU, the Bosch and Siemens units for 6 cylinder engines are 88 pin units.. me bad..

    anyway I found the pin out diagrams for both the Bosch and Siemens units but can't see any engine check on the Siemens unit, so either it doesn't have it or I'm missing it! here are the diagrams if anyone else wants to have a look:


    http://wedophones.com/Manuals/BMW/19...g%20Manual.pdf

    http://www.bimmerforums.co.uk/forum/...4&d=1194952002

    Any help would be much appreciated!
     
     

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    #30
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    That might well be correct, especially as the MS40 was a 320/520 Special that wasn't sold in the US.
     
     

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