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Old 06-27-2012, 12:17 AM   #1
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Join Date: May 2008
Location: San Francisco, CA
Posts: 171
My Ride: 2000 323i
MS42 < MS43 Compatibility Thread...


The purpose of this thread is to discuss and document the possibility of retrofitting a 323/328 equipped with the Siemens MS42 DME with an MS43 DME.

Some background:

DME stands for Digital Motor Electronics. Its the European equivalent to ECU.

There were three versions of the Siemens DME offered with the e46 in North America, each with their own software packages which reflected the optional extras found in the car:
- MS42; used in the 323 and 328 M52TU engines
- MS43; used in the 325 and 330 M54 North American engines up to 03/2003; all 325xi
- MS45; used exclusively in North American for all M54 engines and SULEV engines produced after 03/2003; except all 325xi

The MS42 and MS43 have five harness connectors to handle the flow of data and power supply. They are referred to as "modules" and are numbered X60001 through X60005.

Pin Comparison Files (pdf format)
MS42(blue) vs MS43(red)

Module 1: X60001.pdf

Module 2: X60002.pdf

Module 3: X60003.pdf

Module 4: X60004.pdf

Module 5: X60005.pdf

Pin Location Reassignment: PIN_REASSIGNMENT.pdf

M52TU/M54 Part Comparison Spreadsheet: PART_NUMBER_COMPARISON.pdf

Its already known and documented that this DME swap can be done with the aid of an MS43 engine wiring harness. Our goal is to see if we can recycle the MS42 wiring harness, thus reducing cost and increasing accessibility.

This topic was initiated while discussing a viable solution to upgrade the M52TU to a larger throttle body located here:

Throttle Body Size (post b30 manifold swap)

More to follow...

Last edited by alexxander.foster; 07-01-2012 at 06:53 PM.
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