Thanks! It sounds like you've been diving into the Bosch ME7/MED9 (or similar ME-series) ecosystem. These ECUs are legendary in the tuning and reverse-engineering community because they were one of the first widespread "flashable" Siemens/Bosch units that moved away from simple socketed chips to complex obfuscated code.
Why is the Bosch ME20 Pinout Important?
Small Pins: Used for sensor inputs (MAF, CPS, TPS) and data communication. bosch me20 pinout verified
Have a different ME20 variant (ME 2.1 or ME 2.7)? Post the hardware number below and I’ll check my notes.
Important Notes:
Connector A (often primary; 40-pin typical)
by soldering specific jumpers (e.g., J3 and J4) to mimic a valid immobiliser signal. Installation and Swap Considerations Thanks
When the mechanic found the old BMW tucked behind a hedge, its ME20 ECU sat quiet like a sealed ship's log. She pried the cover and traced the pins — a map of sparks and breath. A1 still remembered the battery's hum, A2 anchored it to earth; the injectors D1–D4 were tiny valves waiting to sing. She fed the ignition coils a careful pulse on E2, whispered voltage into B1, and listened as the dormant cylinders dreamed of motion.
(If your ME20 has different connector sizes/numbering, map pins by function using continuity to known harness points.) Why is the Bosch ME20 Pinout Important