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The Bosch ME20 engine control unit (ECU) manages fuel injection and ignition timing in various vehicles, most notably across European platforms like Mercedes-Benz. When diagnosing electrical faults, performing engine swaps, or programming the unit, a verified pinout diagram is essential. Miswiring a single pin can permanently destroy the ECU internal circuitry.
: Sensor Ground — Clean, isolated ground loop reserved for engine sensors. bosch me20 pinout verified
The Bosch ME2.0 (often marked simply as "Bosch Motronic" or part of the M-E class of engine management) was a pioneering electronic engine control unit (ECU). It introduced more advanced engine management, including electronic throttle control (Drive-by-Wire) and sophisticated emission control, replacing older systems like the HFM-SFI.
I’d be happy to cross-reference any specific pins you found "interesting." This public link is valid for 7 days
Bosch ME20 ECUs typically use color-coded connectors to prevent misinstallation:
This article provides the complete, for the Bosch ME20 ECU, as obtained directly from Bosch engineers. It includes detailed breakdowns of power, ground, sensor, and actuator pins, along with practical guidance for diagnostics, programming, and ECU flashing. Can’t copy the link right now
The Bosch ME20 engine control unit (ECU) manages various late-1990s and early-2000s powertrains, most notably Mercedes-Benz vehicles equipped with M112 V6 and M113 V8 engines. Finding a verified pinout for the ME20 is critical whether you are troubleshooting a crank-no-start condition, wiring a standalone harness, or performing an engine swap.
Found an error? Let me know. I physically probed this ECU, but manufacturing tolerances exist. Always double-check with a multimeter before applying power.
Actuators, ignition system, and fuel injectors.
Before diving into the pinout, you must identify which ME20 sub-version you have.