Source coverage
Med9Dump documents analysis of VAG Bosch MED9.1 firmware and PowerPC code. Its function-discovery and RAM-mapping features provide a starting point for software research.
Software boundaries
The multimap adaptation project uses 1Q0907115C_0040 as a documented example and discusses Bosch software-version compatibility. Track every derived address against its source binary.
Working reference
Use MED9.1 software and definition matching to record the evidence for a particular software version.
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
- Med9Dump. toxictuning and project contributors. Source revision 6541ae40a9dd; accessed 2026-11-10.
- MED9.1 Multimap: adaptation guide. EliasTuning and project contributors. Source revision 59c9b7306a05; accessed 2026-11-10.
Engine-management example: AXX 2.0 FSI Turbo
Volkswagen SSP 337: The 2.0l FSI engine with turbocharger, page 6, identifies Bosch Motronic MED9.1 on the AXX engine, first introduced in the Audi A3 Sportback and then the Volkswagen Golf GTI. This is a documented application example, not a complete MED9.1 fitment list.
Direct injection does not imply stratified lean operation. SSP 337 describes homogeneous mixture formation for this engine, page 17. It also distinguishes two injections during cold-start catalyst heating from the warmed-up main operating mode, page 19. Keep operating state with any lambda or injector-time log.
Separate fuel supply from rail-pressure control
The SSP 337 fuel diagram, page 18, separates the low-pressure supply and high-pressure circuits and describes demand-controlled electric-pump operation. VW SSP 840293, page 32, identifies G410 feedback for supply-pump control through J538/G6, and G247 feedback for high-pressure regulation through N276 in its MED9.1 installation. These component names describe control roles; they are not connector pin assignments.
When investigating fuelling, record which pressure is being requested or measured, its units and operating state, alongside lambda and injection timing. Use service information for the fitted engine. The presence, scaling and availability of diagnostic channels must be checked for the particular software; the existing software-research references above do not provide a universal engine calibration.
Additional OEM sources
- Volkswagen SSP 337: The 2.0l FSI engine with turbocharger, pages 6 and 17-19.
- Volkswagen SSP 840293: Engine Management Systems, February 2010, pages 29-32.
OEM training documents hosted on independent mirrors, accessed 2026-11-10. They describe design and function and direct repair work to the relevant current service literature.