Page organisation in this revision
- Page type
- ECU hub
- Subject
- ECUs
- Parent
- Siemens MS
- Applies to
- No ECU-specific applicability
- Tool groups
- Not recorded in this older revision
- Manufacturers
- Not recorded in this older revision
Changes from revision 1 to revision 2
Removed text is struck through; added text is highlighted.
Identification and variantsMS4X describes C166-based MS41 hardware and a common 256 kB flashable version. Its hardware list is incomplete; verify the installed unit rather than assuming every MS41 is flashable. MS4X reference.Choose MS41.0, MS41.1 or MS41.2 for the documented engine/emissions context.Documented 256 kB layoutStartEnd inclusiveRegionSize0x000000x07FFFBootloader / UIF32 KiB0x080000x0FFFFUndocumented32 KiB0x100000x15FFFCalibration24 KiB0x160000x1FFFFUndocumented40 KiB0x200000x3FFFFProgram128 KiBThese are full-image offsets. MS4X reference.For a raw calibration slice starting at 0x10000, a full-image address of 0x10020 would be offset 0x20 within that slice. This is address arithmetic, not an instruction to change the definition’s configured offset. Check the actual file format and XDF address basis first.Calibration routeUse the MS41 map guide for fueling, ignition and idle entry points. Start with file identification and injector-data checks before modifying a working file.Keep boot/identity information distinct from calibration work. Preserve undocumented regions in backups and comparisons; an undocumented label does not establish unused memory.Sources and scopeOriginal reference notes by Tuning Wiki, informed by the linked MS4X Wiki pages. MS4X Wiki contributors and the authors credited by each linked project remain the source authors. Sources checked 10 November 2026. Suggested validation steps and worked arithmetic are editorial guidance; they are not a tested calibration or a claim of hardware verification.Siemens MS41 (revision 23746).Definition Files (revision 23632).Identification and scopeMS4X describes MS41.0 for M52, MS41.1 for M52 OBDII and MS41.2 for US S52. The memory reference separates bootloader, calibration and program regions.Reference topicsFollow the cited family reference for the full memory layout and map descriptions. Record the software identifier with each definition; include units, axes and operating conditions when expanding a map entry.SourcesCurated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.MS4X Wiki: Siemens MS41. MS4X Wiki contributors. Source revision oldid 23746; accessed 2026-11-10.MS4X Wiki: Definition Files. MS4X Wiki contributors; individual definition authors retain their credits. Source revision oldid 23632; accessed 2026-11-10.
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Revision 1: Siemens MS41
Identification and scope
MS4X describes MS41.0 for M52, MS41.1 for M52 OBDII and MS41.2 for US S52. The memory reference separates bootloader, calibration and program regions.
Reference topics
Follow the cited family reference for the full memory layout and map descriptions. Record the software identifier with each definition; include units, axes and operating conditions when expanding a map entry.
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
Revision 2: Siemens MS41
Identification and variants
MS4X describes C166-based MS41 hardware and a common 256 kB flashable version. Its hardware list is incomplete; verify the installed unit rather than assuming every MS41 is flashable. MS4X reference.
Choose MS41.0, MS41.1 or MS41.2 for the documented engine/emissions context.
Documented 256 kB layout
| Start | End inclusive | Region | Size |
|---|
| 0x00000 | 0x07FFF | Bootloader / UIF | 32 KiB |
| 0x08000 | 0x0FFFF | Undocumented | 32 KiB |
| 0x10000 | 0x15FFF | Calibration | 24 KiB |
| 0x16000 | 0x1FFFF | Undocumented | 40 KiB |
| 0x20000 | 0x3FFFF | Program | 128 KiB |
These are full-image offsets. MS4X reference.
For a raw calibration slice starting at 0x10000, a full-image address of 0x10020 would be offset 0x20 within that slice. This is address arithmetic, not an instruction to change the definition’s configured offset. Check the actual file format and XDF address basis first.
Calibration route
Use the MS41 map guide for fueling, ignition and idle entry points. Start with file identification and injector-data checks before modifying a working file.
Keep boot/identity information distinct from calibration work. Preserve undocumented regions in backups and comparisons; an undocumented label does not establish unused memory.
Sources and scope
Original reference notes by Tuning Wiki, informed by the linked MS4X Wiki pages. MS4X Wiki contributors and the authors credited by each linked project remain the source authors. Sources checked 10 November 2026. Suggested validation steps and worked arithmetic are editorial guidance; they are not a tested calibration or a claim of hardware verification.