Note: This document summarizes a verified pinout for the Bosch ME20 engine control unit (ECU), along with wiring notes, common signals, testing tips, and safety/diagnostic considerations. Use it for reference during bench-testing, wiring harness repair, diagnostics, or retrofit projects. Confirm with continuity testing and the specific ECU label/connector before making permanent wiring changes.
Why “verified” matters: Many online pinouts mislabel the Knock Sensor lines (pins 24 & 25 on the black connector) or swap Injector Grounds with Shield Grounds. The following data has been bench-tested. bosch me20 pinout verified
Bosch Motronic ME 2.0 (and its close relative ) is a widely used Engine Control Unit (ECU), primarily found in Mercedes-Benz vehicles from the late 1990s Bosch ME20 ECU — Pinout (verified) and useful
Power and Ground Pins:
Direct Connection: Use cable F32GN037C/D for bench work—ensure the Power LED is active before reading. Why “verified” matters: Many online pinouts mislabel the
Sometimes people confuse ME pinouts with Simos (like Simos 18), but the Bosch ME housing shapes (the "Sandcastle" design) are distinct. The pin numbering (1-xx on one side, xx-yy on the other) is counter-intuitive compared to Japanese ECUs.
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