keen 6 Report post Posted September 4, 2021 My racecar E30 has a M50B20 fitted. That part is all good. The car runs 99% good. But there an annoying problem that it has and I am into starting from scratch to try and locate it. At this point the problem is not my main focus right now. I could be barking up the wrong tree but please give me the chance to trouble shoot from the bottom up. The car was dyno'ed and the mechanic has suggested to keep costs down I go away and look for some suggested things myself. The main thing he found was he couldn't talk to the ECU through the diagnostic plug although it did power up. I have been tasked with tracing all the pins back to the ECU. That part I can do. the part I cant do is google find the pins in the plug that relate to the pin numbers on the plug that goes into the ECU. Can someone just tell me what pins in the diagnostic 20 pin plug go to the ECU plug numbers and maybe the colours of the relevant wires PLEASE. There are only 6 sockets with connections in the Diagnostic plug. Quote Share this post Link to post Share on other sites
M3AN 4015 Report post Posted September 5, 2021 I'm not sure if this will help but perhaps you can identify the 6 you need? https://www.e30zone.net/e30wiki/index.php/M5x_Looms Quote Share this post Link to post Share on other sites
keen 6 Report post Posted September 6, 2021 Thank you but Im still having trouble with the id at the plug. Quote Share this post Link to post Share on other sites
