Page organisation in this revision
- Page type
- Technical article
- Subject
- Reference
- Parent
- Siemens MSS
- Applies to
- Siemens MSS52, Siemens MSS54, Siemens MSS54HP
- Tool groups
- None
- Manufacturers
- BMW
Changes from revision 1 to revision 1
Removed text is struck through; added text is highlighted.
Scope and identity
This shared guide covers the MSS52, MSS54 and MSS54HP definitions examined for this library. Keep ECU type, full software ID, binary provenance and XDF commit together. The MSS52 project lists two software contexts; the MSS54 collection has version-specific files. Use the MSS52 coverage record or MSS54/HP matching record for the precise source coverage.
Read the name with the definition
The MSS54 project explains K as a constant, KL as a curve and KF as a map. Its examples use suffixes such as N for engine speed and RF for relative filling. MSS54/MSS54HP project guide.
Treat the name as a route into the definition. Record the stored width and signedness, byte order, conversion equation, axis source, row/column count and active-state description. A familiar name does not supply an address, unit or range for another software version.
Keep confidence fields with a map
The MSS54 descriptions report Matched Length, MatchRatio, NearbyBlockMatch, BlockFound and HasDuplicate?. They describe how an item was found and compared. MSS54/MSS54HP project guide.
A numerical match ratio is not a measured probability that the interpretation is correct. Preserve the comments beside any copied observation, especially when an address was inferred from nearby blocks or has competing matches. Label a source description, a static check and an observed ECU result separately.
Alternate views can share storage
The MSS52 throttle example shows three views of one data range using different equations. The MSS52 VANOS example also shows transposed and percentage/angle views. Select one documented representation for a change and compare the underlying bytes afterwards.
For illustration, a raw value of 128 displayed with x/128 is 1.0; with x/10 it is 12.8. The equation changes the interpretation of stored data. It supplies no evidence that two tables with those equations control the same function.
Use Choosing ECU definition files for the general provenance record and MSS calibration validation for a reviewable comparison.
Sources and evidence
Original Tuning Wiki reference notes. Definition data and source-code observations are identified as such; they do not establish runtime behaviour or a tested calibration. Validation suggestions and worked arithmetic are editorial guidance. Sources checked 10 November 2026.
MSS52: Ken Malinich (kdm) and the contributors credited by his project; copyright © 2019 Ken Malinich, MIT licence. MSS54/MSS54HP: saildot4k, the OpenSource MSS54 Project and credited contributors. Use the original files and retain their individual credits.
MSS52 project and software coverage — commit a04c0d24fe63.MSS54/MSS54HP project guide — commit dd845dd34225.
Rendered revisions
Open each version to inspect formatting, tables and photographs.
Revision 1: MSS definition files and map interpretation
Scope and identity
This shared guide covers the MSS52, MSS54 and MSS54HP definitions examined for this library. Keep ECU type, full software ID, binary provenance and XDF commit together. The MSS52 project lists two software contexts; the MSS54 collection has version-specific files. Use the MSS52 coverage record or MSS54/HP matching record for the precise source coverage.
Read the name with the definition
The MSS54 project explains K as a constant, KL as a curve and KF as a map. Its examples use suffixes such as N for engine speed and RF for relative filling. MSS54/MSS54HP project guide.
Treat the name as a route into the definition. Record the stored width and signedness, byte order, conversion equation, axis source, row/column count and active-state description. A familiar name does not supply an address, unit or range for another software version.
Keep confidence fields with a map
The MSS54 descriptions report Matched Length, MatchRatio, NearbyBlockMatch, BlockFound and HasDuplicate?. They describe how an item was found and compared. MSS54/MSS54HP project guide.
A numerical match ratio is not a measured probability that the interpretation is correct. Preserve the comments beside any copied observation, especially when an address was inferred from nearby blocks or has competing matches. Label a source description, a static check and an observed ECU result separately.
Alternate views can share storage
The MSS52 throttle example shows three views of one data range using different equations. The MSS52 VANOS example also shows transposed and percentage/angle views. Select one documented representation for a change and compare the underlying bytes afterwards.
For illustration, a raw value of 128 displayed with x/128 is 1.0; with x/10 it is 12.8. The equation changes the interpretation of stored data. It supplies no evidence that two tables with those equations control the same function.
Use Choosing ECU definition files for the general provenance record and MSS calibration validation for a reviewable comparison.
Sources and evidence
Original Tuning Wiki reference notes. Definition data and source-code observations are identified as such; they do not establish runtime behaviour or a tested calibration. Validation suggestions and worked arithmetic are editorial guidance. Sources checked 10 November 2026.
MSS52: Ken Malinich (kdm) and the contributors credited by his project; copyright © 2019 Ken Malinich, MIT licence. MSS54/MSS54HP: saildot4k, the OpenSource MSS54 Project and credited contributors. Use the original files and retain their individual credits.
Revision 1: MSS definition files and map interpretation
Scope and identity
This shared guide covers the MSS52, MSS54 and MSS54HP definitions examined for this library. Keep ECU type, full software ID, binary provenance and XDF commit together. The MSS52 project lists two software contexts; the MSS54 collection has version-specific files. Use the MSS52 coverage record or MSS54/HP matching record for the precise source coverage.
Read the name with the definition
The MSS54 project explains K as a constant, KL as a curve and KF as a map. Its examples use suffixes such as N for engine speed and RF for relative filling. MSS54/MSS54HP project guide.
Treat the name as a route into the definition. Record the stored width and signedness, byte order, conversion equation, axis source, row/column count and active-state description. A familiar name does not supply an address, unit or range for another software version.
Keep confidence fields with a map
The MSS54 descriptions report Matched Length, MatchRatio, NearbyBlockMatch, BlockFound and HasDuplicate?. They describe how an item was found and compared. MSS54/MSS54HP project guide.
A numerical match ratio is not a measured probability that the interpretation is correct. Preserve the comments beside any copied observation, especially when an address was inferred from nearby blocks or has competing matches. Label a source description, a static check and an observed ECU result separately.
Alternate views can share storage
The MSS52 throttle example shows three views of one data range using different equations. The MSS52 VANOS example also shows transposed and percentage/angle views. Select one documented representation for a change and compare the underlying bytes afterwards.
For illustration, a raw value of 128 displayed with x/128 is 1.0; with x/10 it is 12.8. The equation changes the interpretation of stored data. It supplies no evidence that two tables with those equations control the same function.
Use Choosing ECU definition files for the general provenance record and MSS calibration validation for a reviewable comparison.
Sources and evidence
Original Tuning Wiki reference notes. Definition data and source-code observations are identified as such; they do not establish runtime behaviour or a tested calibration. Validation suggestions and worked arithmetic are editorial guidance. Sources checked 10 November 2026.
MSS52: Ken Malinich (kdm) and the contributors credited by his project; copyright © 2019 Ken Malinich, MIT licence. MSS54/MSS54HP: saildot4k, the OpenSource MSS54 Project and credited contributors. Use the original files and retain their individual credits.