Guide to your OBD2 swap! Diagnostics and logging

[Northern]

Interesting because my Peake tool doesn't work on my M52 car either, but RRlogger and INPA work fine via the 20 pin connector/obd2 adapter/INPA cable.

[BlackSpeed66]

I'm interested in the connections on the 20 pin diag connector as well. I tried to plug my round Peake tool shortly after i got the engine running and it didn't seem to want to read it. I haven't really messed with it since as the OBDII connector seems to be working ok with my BT dongle. Would like to get the 20 pin connector functional in the near future though!

[Northern]

Just trying to fill in as much as I can while Dave is super busy getting set up his bitchin' new shop haha

Hopefully going to have my car setup soon running this logging setup, I'll try to do a decent explanation of how to get an Innovate LC-1 to work with RR logger for tuning/logging purposes.

[NC325iC]

You are my hero

But if as you say they aren't needed in a swap then there must be another reason I can't get diagnostics to work.

I'll have to check my grounds next.

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[Northern]

anyone know where txd and rxd come from?

For anyone reading who doesn't have these memorized:
X6000 ECU connector
X6002 ADS Diag port
X20 Underhood main engine/body connector
X6031 Small Underhood engine/body connector adjacent to X20
X19527 OBD2 port


TXD X6002-20 -> x20-17 -> abs/asc/ews/obc/other body crap
RXD X6002-15 -> X20-16 -> OBC/Cluster/ASC/other body crap
^These two bridged under X6002 cap.

TXD2 X6000-88 -> X6002-17 bridged via cap with X6002-2-> X6031-4 -> X19527-7

Hot in ACCY/RUN/START:
front power dist -> X6031-8 -> X6002-4

TXD and RXD don't seem to have any purpose on a swapped car, they seem to be exclusively for E36 chassis stuff. According to the ETM, they don't connect to the ECU (Further reinforced by the fact the X6000 pinout doesn't list them) so the lack of anything on those pins makes sense.

[NC325iC]

anyone know where txd and rxd come from?

[NC325iC]

trying to figure out why I cant get any info from my 20 pin. I am hunting through and it appears that I have no connection to pins 15 and 20 (RXD and TXD) I do have connections for pin 17 (TXD2) and pin 2 (TXD2). I cant seem to find a TXD signal in the DME other than the one that goes to pin 17 on the 20 pin. And I cant find any RXD signal, does that matter?

[NC325iC]

Sucks that I didn't know this before I finished up my wiring. Now I'm gonna have to hunt through.

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[NC325iC]

http://www.bimmerfest.com/forums/showthread.php?t=327491

This has a good pinout too

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[328ijunkie]

Not as helpful as https://boyanmilushev.wordpress.com/...obd-ii-pinout/ ;)

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True

lots of extra wires there vs what the E36 uses. 2 grounds, switched +12v, and the K-line.

IIRC you can pick up the switched +12v and k-line from X6031 pins 8 and 4, respectively.

And this :)

[Northern]

lots of extra wires there vs what the E36 uses. 2 grounds, switched +12v, and the K-line.

IIRC you can pick up the switched +12v and k-line from X6031 pins 8 and 4, respectively.

[NC325iC]

Not as helpful as https://boyanmilushev.wordpress.com/...obd-ii-pinout/ ;)

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[328ijunkie]

www.wedophones.com/BMWManualsLead.htm ;)

[NC325iC]

gn/white at diag port needs power.
red a diag port needs power.

Both get +12? Any pin numbers?

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[328ijunkie]

Any more on what pin needs power?

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Thanks Dave - let me try a few more things here before i get you guys on the horn. It appears winter has finally hit Cleveland here so the car's not going anywhere for a bit

gn/white at diag port needs power.
red a diag port needs power.