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      08-10-2020, 08:50 AM   #1
wyshyvanuk
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ECU Wiring Hunt

While wading through the murky instructions to install a G-Power supercharger on my 2008 Z4M, I have found it necessary to add a relay to the ECU. The relay requires a 12V supply for the water pumps (I'm hoping that they are the heaviest gauge red wires), and the positive wire to the pumps (easy). But it also requires an ECU ground wire and a red-yellow wire from the ignition. I'm clueless about the location of the last two, and I'm a little reluctant to guess. Any insight would be very much appreciated. My ECU box appears below:
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Last edited by wyshyvanuk; 08-10-2020 at 09:19 AM.. Reason: Change wire description
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      08-10-2020, 08:56 AM   #2
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Double Post

I've also posted this to the Navigation, Audio, Bluetooth, Stereo, Electronics Talk forum. Seemed like it might be more appropriate. My apologies.
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      08-10-2020, 07:25 PM   #3
3002 tii
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You need a pinout diagram specific to the ECU. But when I had my 3.0si, I had to tap 12v and ground for my o2 sims. See here.

Edit - I think I found it (see attachment).
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File Type: pdf A6000 MSS70 Pinout.pdf (498.9 KB, 294 views)
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Last edited by 3002 tii; 08-10-2020 at 07:32 PM..
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      10-23-2020, 01:20 AM   #4
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I'm on a hunt as well actually, to install o2 sims. wyshyvanuk how did your hunt go?
did you use the pinout or some other method?
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      10-23-2020, 06:33 AM   #5
wyshyvanuk
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Hunt has been placed on back burner. It appears that I had an intercooler that's not the right size for my application. Hopefully a new part will arrive from Germany. Once the installation is locked up, I'll return to the wiring issue. Good luck with your search!!
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      10-24-2020, 09:55 AM   #6
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Good luck! I had the same heat exchanger issue with my install... they shipped an M6 heat exchanger instead of the Z4M part. The other delay was in the turnaround time on the ECU tune. I'm not sure how the shop performed the tune, whether through a professional tool, end user flash cable, or by mailing off the ECU. I just remember it took a couple weeks. Things have changed in the last decade, and fortunately this wouldn't be an issue for me now

If you have access to a TIS, you can see the wiring color there. You can also visually confirm its color on the #1 ignition coil.
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Last edited by pokeybritches; 10-24-2020 at 09:57 AM.. Reason: Added info
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