Designation and processor
The Chiptuner-Datenbank control-unit catalogue lists Bosch Motronic M4.06. Its processor is not independently established by that entry; this is a research candidate in the Motronic 4 index, not a confirmed 8051-based example.
Identification and scope
Record the Bosch and vehicle-manufacturer ECU part numbers, engine code, market, year, hardware and software identity. Identify the processor from the specific unit before relying on its architecture. No pinout, interchangeability or programming procedure is established by a family designation alone.