View Full Version : N54 new/old information

05-02-2010, 11:52 AM
Since buying my car, I had been looking for information regarding the N54 description/principles of operation but information except for bits and pieces here and there including from the BMWNA site had been quite elusive. About 2 weeks ago I stumbled upon the following files from the E90 post site that appears to be part of a training CBT. These files were dated 2007 when the first iteration of the N54 came out but I find them very informative. Hopefully some of you guys will also find them helpful and present some solution to a lot of issues and wonderments...

The files had been separated for upload and the bookmarks do not work.

05-02-2010, 11:57 AM
I had to break up the files to upload due to the restriction. Here's the rest. Good reading.

05-02-2010, 12:18 PM

05-02-2010, 07:37 PM
Thank you for the link. I have a much better understanding of how it all works. The diagrams were great.

05-02-2010, 08:15 PM
There are actually 4 files to this set.. When set up correctly the table of contents links the 4 files together nicely. IM me and I'll be glad to email the set as a zip file. It is very informative.

Oops... I see you posted the other 2 files separately.

05-03-2010, 06:25 AM
This is not part of the set, but I ran across it and many will find it interesting as well... Details about the oil sensor on new engines with no dipstick.

05-06-2010, 06:12 PM
Attached is the new revised SIB 125506 which states HDP emissions warranty extension coverage to 10/120 including MY2010 of the N54 engine. No changes had been made to the N54 Engine Diagnostic Fault Tree since March 2010.

It now stipulates that if the electric pump's minimum output pressure threshold is reached within 20 sec, the DME will now need to be reprogrammed to the newest software load.