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
- MS42/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 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.
- Siemens MS42 (revision 23721).
- Definition Files (revision 23632).