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.
IdentificationMS4X identifies MS42 with BMW M52TU, a 20 MHz C167CR_SR and 512 kB flash. MS4X reference.Documented flash layoutStartEnd inclusiveRegionSize0x000000x0FFFFBootloader / UIF64 KiB0x100000x3FFFFProgram, first part192 KiB0x400000x47FFFUnused in the source layout32 KiB0x480000x4FFFFCalibration32 KiB0x500000x7FFFFProgram, second part192 KiBFull-image offsets; the source describes three CRC16 checksums. MS4X reference; MS4X reference.Keep the original file and the read-tool log when comparing image sizes. For a raw calibration-only slice with origin 0x48000, full-image address 0x48020 corresponds arithmetically to slice offset 0x20. Verify that this is the format your definition expects before using that relationship.Definition coverage at the cited revisionMS4X lists TunerPro definitions for 01100AD and 01100C6, with 32 kB partial / 512 kB full formats; it flags incomplete translations/categories. MS4X reference.Read nextMS42/MS43 load reference — use the correct signal for each axis.Shared fuel and camshaft control — state-dependent map relationships.MS42 configuration and diagnostics — learned equipment and a fault record.Calibration files and programming — backup provenance and supported tool scope.Keep chassis, engine displacement, transmission and installed software with any added example. These identification fields support a precise comparison without creating undocumented ECU subvariants.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 MS42 (revision 23721).Definition Files (revision 23632).Identification and scopeMS4X associates MS42 with the M52TU engine and a C167 processor with 512 kB flash. It distinguishes injection, ignition and VANOS load representations.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.MS42 and MS43 load reference provides a shared introduction to their load terminology.SourcesCurated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.MS4X Wiki: Siemens MS42. MS4X Wiki contributors. Source revision oldid 23721; 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 MS42
Identification and scope
MS4X associates MS42 with the M52TU engine and a C167 processor with 512 kB flash. It distinguishes injection, ignition and VANOS load representations.
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.
MS42 and MS43 load reference provides a shared introduction to their load terminology.
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
Revision 2: Siemens MS42
Identification
MS4X identifies MS42 with BMW M52TU, a 20 MHz C167CR_SR and 512 kB flash. MS4X reference.
Documented flash layout
| Start | End inclusive | Region | Size |
|---|
| 0x00000 | 0x0FFFF | Bootloader / UIF | 64 KiB |
| 0x10000 | 0x3FFFF | Program, first part | 192 KiB |
| 0x40000 | 0x47FFF | Unused in the source layout | 32 KiB |
| 0x48000 | 0x4FFFF | Calibration | 32 KiB |
| 0x50000 | 0x7FFFF | Program, second part | 192 KiB |
Full-image offsets; the source describes three CRC16 checksums. MS4X reference; MS4X reference.
Keep the original file and the read-tool log when comparing image sizes. For a raw calibration-only slice with origin 0x48000, full-image address 0x48020 corresponds arithmetically to slice offset 0x20. Verify that this is the format your definition expects before using that relationship.
Definition coverage at the cited revision
MS4X lists TunerPro definitions for 01100AD and 01100C6, with 32 kB partial / 512 kB full formats; it flags incomplete translations/categories. MS4X reference.
Read next
Keep chassis, engine displacement, transmission and installed software with any added example. These identification fields support a precise comparison without creating undocumented ECU subvariants.
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.