Identification and memory
MS4X identifies MS43 with BMW M54, a 24 MHz C167CR_SR and 512 kB flash. MS4X reference.
| Start | End inclusive | Region | Size |
|---|---|---|---|
| 0x00000 | 0x0FFFF | Bootloader / UIF | 64 KiB |
| 0x10000 | 0x6FFFF | Program | 384 KiB |
| 0x70000 | 0x7FFFF | Calibration | 64 KiB |
Full-image offsets. MS4X documents CRC16 checks plus two additive monitoring checks; monitoring checks are corrected before the enclosing CRCs. MS4X reference.
Software-definition coverage
The cited TunerPro catalogue lists MS430037, MS430055, MS430056, MS430064, MS430066 and MS430069, with 64 kB partial / 512 kB full definitions. Visibility settings can hide less-described items. MS4X reference.
These are software identities within the MS43 branch. Keep the binary and definition revision together; a map address recorded for one release needs fresh evidence before use on another.
Shared and MS43-specific topics
- Shared load reference and fuel/camshaft control.
- MS43 driver demand and torque — pedal processing, actuators and intervention evidence.
- MS43 hardware and learned variants — coil and ambient-sensor context.
- MS430069 extended-load package — exact engine/chassis/software scope and matching files.
For the 64 kB calibration range above, full-image address 0x70020 is offset 0x20 in an unwrapped slice beginning at 0x70000. Use this as a file-format check, then verify the actual definition basis and any patch-specific layout.
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 MS43 (revision 23749).
- Definition Files (revision 23632).