Page organisation in this revision
- Page type
- Technical article
- Subject
- Tuning
- Parent
- Siemens MS43
- Applies to
- Siemens MS43
- Tool groups
- Not recorded in this older revision
- Manufacturers
- Not recorded in this older revision
Changes from revision 1 to revision 1
Removed text is struck through; added text is highlighted.
Hardware changes matter
MS4X describes Index 04 coil-type detection for the transition from 300 g to pencil coils, and separate Motorola/Infineon ambient-pressure-sensor detection. The latter result is stored in the boot sector and is normally learned once. MS4X reference; MS4X reference.
Record hardware index, actual coil installation, wiring provenance and software before comparing calibrations from different controllers. For a substituted or repaired ECU, keep photographs and part identifiers with the investigation. A matching software label alone does not describe those physical differences.
Record what is being relearned
The source also documents CAN-based gearbox, A/C and steering-angle-sensor learning. MS4X reference.
Make a before/after record of the reported variants and the operation used to reset them. Distinguish an ordinary adaptation reset from a persistent hardware-detection record in the boot sector. Use the source’s hardware-specific explanation before attempting a relearn; do not assume one reset command refreshes every stored identification.
Useful comparison record
AreaRecordControllerLabel, hardware index, reported software and original read hash.Ignition hardwareCoil type, harness/repair history and relevant reported variant.Ambient sensingInstalled hardware identification and plausible ambient reading.Vehicle equipmentTransmission, accessory and network communication evidence.
When the evidence is incomplete, retain the uncertainty on this record. Use the logging guide to capture the actual behaviour and faults before proposing calibration changes.
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).
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Revision 1: MS43 hardware and learned variants
Hardware changes matter
MS4X describes Index 04 coil-type detection for the transition from 300 g to pencil coils, and separate Motorola/Infineon ambient-pressure-sensor detection. The latter result is stored in the boot sector and is normally learned once. MS4X reference; MS4X reference.
Record hardware index, actual coil installation, wiring provenance and software before comparing calibrations from different controllers. For a substituted or repaired ECU, keep photographs and part identifiers with the investigation. A matching software label alone does not describe those physical differences.
Record what is being relearned
The source also documents CAN-based gearbox, A/C and steering-angle-sensor learning. MS4X reference.
Make a before/after record of the reported variants and the operation used to reset them. Distinguish an ordinary adaptation reset from a persistent hardware-detection record in the boot sector. Use the source’s hardware-specific explanation before attempting a relearn; do not assume one reset command refreshes every stored identification.
Useful comparison record
| Area | Record |
|---|
| Controller | Label, hardware index, reported software and original read hash. |
| Ignition hardware | Coil type, harness/repair history and relevant reported variant. |
| Ambient sensing | Installed hardware identification and plausible ambient reading. |
| Vehicle equipment | Transmission, accessory and network communication evidence. |
When the evidence is incomplete, retain the uncertainty on this record. Use the logging guide to capture the actual behaviour and faults before proposing calibration changes.
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.
Revision 1: MS43 hardware and learned variants
Hardware changes matter
MS4X describes Index 04 coil-type detection for the transition from 300 g to pencil coils, and separate Motorola/Infineon ambient-pressure-sensor detection. The latter result is stored in the boot sector and is normally learned once. MS4X reference; MS4X reference.
Record hardware index, actual coil installation, wiring provenance and software before comparing calibrations from different controllers. For a substituted or repaired ECU, keep photographs and part identifiers with the investigation. A matching software label alone does not describe those physical differences.
Record what is being relearned
The source also documents CAN-based gearbox, A/C and steering-angle-sensor learning. MS4X reference.
Make a before/after record of the reported variants and the operation used to reset them. Distinguish an ordinary adaptation reset from a persistent hardware-detection record in the boot sector. Use the source’s hardware-specific explanation before attempting a relearn; do not assume one reset command refreshes every stored identification.
Useful comparison record
| Area | Record |
|---|
| Controller | Label, hardware index, reported software and original read hash. |
| Ignition hardware | Coil type, harness/repair history and relevant reported variant. |
| Ambient sensing | Installed hardware identification and plausible ambient reading. |
| Vehicle equipment | Transmission, accessory and network communication evidence. |
When the evidence is incomplete, retain the uncertainty on this record. Use the logging guide to capture the actual behaviour and faults before proposing calibration changes.
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.