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Thread: S52 swapped e30 obd2 port?

  1. #1
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    S52 swapped e30 obd2 port?

    Is it possible to wire up an obd2 16 pin port in my s52 swapped e30? If so how do I wire it up so that I can check diagnostics and have the dme tuned? It’s a 1986 325e with an s52 that’s got an m50 intake. I got the car with the swap already done car runs but I want to have the tune checked and be able to hookup to check on live diagnostics. Sorry if this is a repost but I’m new to forums. Any help is greatly appreciated.

  2. #2
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    Quote Originally Posted by Leomochi3 View Post
    Is it possible to wire up an obd2 16 pin port in my s52 swapped e30? If so how do I wire it up so that I can check diagnostics and have the dme tuned? It’s a 1986 325e with an s52 that’s got an m50 intake. I got the car with the swap already done car runs but I want to have the tune checked and be able to hookup to check on live diagnostics. Sorry if this is a repost but I’m new to forums. Any help is greatly appreciated.
    Check this out hope this help I recently converted my US s50 to OBD2 and I was instructed that you can connect to the 16 pin DLC or Diag port on the engine harness using an adapter to a scan tool. I believe 16 pin is on vehicle body harness (e36)

    I'll be using this guide in order to read live data http://22rpd.com/img/obd2.pdf

  3. #3
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    The 16 pin is on the body harnes I found out. I think I’m gonna try and adaptor for the 20 pin under the hood. But I counted to number of actual pins and theres only 9. But there’s 20 holes

  4. #4
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    If your swap is running off an obd2 harness and dme the obd2 port is an easy add on. It's only 3 or 4 wires iirc. Power, ground, and 1 or 2 wires that go to the dme plug. Find an online electrical diagram for your dme or get a Bentley manual.

  5. #5
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    I saw that someone said it was 4 wires but I wasn’t sure if that was enough to be able to have it tuned. I’ve been looking at the obd2 ports and they have a lot of wires on the back so I wasnt sure if I needed all of them to be hooked up to be able to have the dme tuned or not. Is the 4 wires all it needs to be able to tune the dme?
    Last edited by Leomochi3; 01-01-2020 at 09:59 PM.

  6. #6
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    Quote Originally Posted by Leomochi3 View Post
    I saw that someone said it was 4 wires but I wasn’t sure if that was enough to be able to have it tuned. I’ve been looking at the obd2 ports and they have a lot of wires on the back so I wasnt sure if I needed all of them to be hooked up to be able to have the dme tuned or not. Is the 4 wires all it needs to be able to tune the dme?
    It's been awhile, but I'm pretty sure the e36 obd2 port only has 4 wires factory. My obd2 swapped e30s were all tuned with the dme out of the car.

    What dme is in your car?

  7. #7
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    6D3D6158-A278-4D1B-9AD4-1D5682A4E1F5.jpg
    im not sure honestly. Here’s a pic of it. I ran the vin it says it’s from a 95 m3. My motor is an s52. I looked at the code on the side of the block. Can’t see the vin on the back of the motor
    Attached Images Attached Images

  8. #8
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    That's an obd1 dme, which I suspected. There is no obd2 ports for them, tuning is done through chips.

    506, (I believe 413 are the same) is the dme number to look for the appropriate chip, it may have one already, you'd have to open it to check. The chip is attached to the board with unsoldered pins so it can pull out.
    Last edited by mentaleeill; 01-02-2020 at 05:41 PM.

  9. #9
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    Ok I’ll take a look at it. I’m curious how is it running the motor then? I’m 90% positive the motor is an s52 which is obd2 isn’t it? I looked at the block code and from what I’ve read the first two numbers tell you how many liters the engine is and when I looked the first two numbers where 32 so I was figuring it was an s52? Will an obd1 dme plug into an odb2 harness?
    Last edited by Leomochi3; 01-03-2020 at 12:14 AM.

  10. #10
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    You can run an S52 on obd1. It’s the wire harness, sensors and ECU that change from obd1 and obd2.

  11. #11
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    So my wiring harness is obd1? I’m wondering if the harness had to be converted or did the put obd1 sensors in how do you make the s52 run on the obd1 harness and ecu?

  12. #12
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    Quote Originally Posted by Leomochi3 View Post
    My motor is an s52. I looked at the code on the side of the block. Can’t see the vin on the back of the motor
    Can you post a picture of the code you see on the side of the block?
    Diving in at the shallow end!

  13. #13
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    E17C8512-50C7-4084-B3AD-DE6CC156341A.jpg

    it’s really hard to read and it’s raining here today. I tried to clean it up I’ll have to clean it better when the weather is better and for some reason the pic is upside down
    Last edited by Leomochi3; 01-03-2020 at 02:19 PM.

  14. #14
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    Well, thank you for trying! I just played around on enhancing the contrast, etc., on your photo and I thought the numbers were "3579..." I have no knowledge of BMW block codes, I must admit.
    Diving in at the shallow end!

  15. #15
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    The bottom number start with 3&2 and from what I’ve read those are the ones that say what the displacement is so I was assuming it was a 3.2. But I’m not 100%

  16. #16
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    Obd1 s52 swaps were the easy way, so most people did them that way. Using an obd2 dme, harness, etc. Requires running ews, pre and post cat o2s, tank pressure valves, etc....or having it coded out of the dme all together.

    You definitely have an obd1 dme and harness.
    Last edited by mentaleeill; 01-04-2020 at 05:01 PM.

  17. #17
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    I thought you said my dme was obd1? When I posted the pic of the dme you said it was an obd1. When I ran the vin on the dme it says it’s for a 95 m3. I’m confused now lol.

  18. #18
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    Typo?

  19. #19
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    Sorry, auto correct got me and I didn't proof read. Its obd1

  20. #20
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    Oh ok. I’m going to check for the chip tomorrow and get back to you

  21. #21
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    Can you take a look at the crank pulley and see if your running a front crank position sensor OBD2 blocks run a rear crank sensor while OBD1 run the sensor upfront. Sounds like you may have an S52 with an OBD1 set up,which is very common.
    Last edited by E30s50dude; 01-05-2020 at 06:26 PM.

  22. #22
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    Yeah ill check that out next chance I get. My biggest problem right now is that sometimes the engine won’t turn over. Shitty bc I didn’t do the swap so idk how they wired it. I know they repined the Body harnes plug for the s52 engine harness. But idk what they did to make the e30 ignition start the car. Today it wouldn’t do anything so I had to leave the key in the run position and then jump the starter wires with a screw driver. Lol After I got home it started normally with the key a couple times then didn’t then did again.

  23. #23
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    Starter circuit in an e30 is just a black/yellow stripe wire that runs through the x20 plug to the starter. Check connections on the starter, and engine to chassis ground. If the harness looks like it was hacked together, check splices. I always repinned my plugs, but I have seen some really crappy hack jobs.

  24. #24
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    Ok I’ll check it tomorrow. Also there’s a white relay that’s all messed up After doing so research I think it’s the dme relay gonna replace that as well.

  25. #25
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    I checked the wires. They seemed ok but idk much about wiring lol. But I’ve got a new thing happening now. It kinda seems like a maf problem but idk. I’ll be driving and randomly the car will start to fall on it’s face but it won’t die. Just looses power basically for like 5 sec. I’ve been looking at scanners for bmws and found this one https://www.ecstuning.com/b-schwaben...BoCQCwQAvD_BwE
    has anyone used this or know if it’s a good one? Says it’s for obd and obd2 bmws.
    FB3C7F4C-0DE9-4D9B-9858-1DDFED7C0200.jpg
    i just figured I’d ask before buying it.

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