2001 750il M73tu Pinout/wiring diagram

**Dark Phoenix** · 11-20-2018, 04:43 AM

Hello all I need help finding an ecu pinout or powertrain wiring diagram for my e39 touring M73tu swap. I started off wiring this swap using (mitchel on demand) diagrams because they seemed the most complete and made the most sense versus the (Bentley manuals diagrams). I got far enough to get the swap running and driving which is great! But today I started going deeper and started to tether/splice the rest of the wiring to the e39 and started noticing that the diagrams I had were incomplete and were missing wires that existed on the M73tu side. which in this case is a problem because I need everything to work especially all emissions related components.

SO THE BACK STORY TO THE BUILD!
life for my e39 touring (now nicknamed Hiydra) started as a 2000 528iAT. that I drove happily till one day my “genius” self left the radiator cap off by accident and my mom overheated it because she doesn’t read gauges lol. so then coincidentally around the same time I had scooped up a 96 750il for $400 that I was going to flip. but with the situation I decided it would be a great opportunity to swap the M73 into my e39 as a solution. and so I did untill I got stuck due to immobilizer issues which set me back 2 frikin years! until I finally figured it out about 5 months ago. so then I got it running and made it movable even though trans was in failsafe. So I drove it around for about a month happy as hell while I tried to figure out my trans issue. until one Sunday leaving a cars and coffee I was peacefully driving down topanga canyon when I got stopped by California highway patrol for no front license plates. and as he was issuing my ticket noticed I had my laptop connected to the vehicle which was off and closed. he asked why I had it connected to the vehicle and I explained it was for diagnostic purposes only (inpa). but he didn’t buy it and proceeds to ask me to open my hood, so trying to cooperate and play it off as its all stock officer because the swap did look surprisingly stock “at least to me” haha I opened my hood. and he ended up saying that my aftermarket k&n cone filters were not CARB approved. and only for that reason issued me a dam state ref ticket! So that brings me to where I am now. instead of chucking the 528 M52tu back in I decided it would be better to actually make it a legal swap. and so I did my research and found the rules stated the engine has to be the same year or newer than the chassis and have all its emissions components in working order. so i ditched the M73 and went to the junk yard and plucked a 2001 M73tu with trans and wiring for around $700 and stuffed it in my e39. after a few hiccups sorted out its now running and driving!

SO NOW! this brings me to where I’m at right now. and the reason for this post I need the complete diagram to be able to completely and properly tether/splice in the M73tu into my e39 for it to all work in harmony and and correctly.

Any help is greatly appreciated!!

and thank you for taking the time to read this post

Sent from my iPhone using Tapatalk

**Timm** · 11-20-2018, 05:15 AM

The best way to own the diagrams is to buy the WDS wiring diagrams from Ebay - as the WDS only runs on ancient machines, the Ebay sellers usually sell it with virtual machine software as a bundle. The WDS diagram system is horrible, slow, and really hard to use but is the best you are going to get!

**clarkitect** · 11-20-2018, 05:43 AM

Try starting with this maybe?
https://www.bimmerforums.com/forum/s...90-WDS-working

**purplecty** · 11-20-2018, 08:03 AM

Try this if you have an android...

Check out "WDS for Android Free"
https://play.google.com/store/apps/d...wdsviewer.free

Sent from my SM-N960U using Tapatalk

**Dark Phoenix** · 11-21-2018, 11:50 AM

Originally Posted by Timm

The best way to own the diagrams is to buy the WDS wiring diagrams from Ebay - as the WDS only runs on ancient machines, the Ebay sellers usually sell it with virtual machine software as a bundle. The WDS diagram system is horrible, slow, and really hard to use but is the best you are going to get!

Originally Posted by clarkitect

Try starting with this maybe?
https://www.bimmerforums.com/forum/s...90-WDS-working

Originally Posted by purplecty

Try this if you have an android...

Check out "WDS for Android Free"
https://play.google.com/store/apps/d...wdsviewer.free

Sent from my SM-N960U using Tapatalk

This is awesome thank you!

I had never seen or heard of this program before looks like good stuff! and I’ve just purchased a cd off eBay so I’m exited to play around with it when it gets here! Thanks again

and yes I have an android tablet I will give the app a shot as well thanks!

Sent from my iPhone using Tapatalk