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A lot of people get stuck here when verifying pinouts.
Bosch ME20 Pinout Verified: The Ultimate Wiring Guide for Engine Control Units
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 pinout verified
= Necessary for full flash access on these older Bosch units. Bosch Me20 Pinout Verified Apr 2026
Pin 55 must route through the immobilizer box (if retaining factory security) before reaching the OBD2 port.
If the ECU was pulled from a vehicle in a locked state, certain flashing tools cannot read the EEPROM over K-Line without putting the flash chip into boot mode physically. ECU Draws Excessive Amperage This public link is valid for 7 days
use a fused 12V DC power supply rated for at least 3A to 5A.
If you need to power up the ECU on a bench for testing or programming, connect:
To wake up the Bosch ME2.0 ECU on a workbench for data reading, writing, or diagnostic scanning, you only need to connect a few critical pins. Always use a stabilized 12V DC power supply capable of delivering at least 3 to 5 Amperes. Connection Type Pin Assignment Wire Color Notes (Typical Mercedes) Plug 1, Pin 2 Red / Green Ignition Switched (+12V) Plug 1, Pin 1 Black / Yellow Main Ground (GND) Plug 1, Pin 4 & Pin 9 K-Line Diagnostics Plug 5, Pin 3 Green / White CAN-High (Bus) Plug 5, Pin 11 Brown / Red CAN-Low (Bus) Plug 5, Pin 12 Critical Bench Connection Steps Can’t copy the link right now
: While the hardware is often similar across V6 (M112) and V8 (M113) engines, the internal coding determines compatibility with manual or automatic transmissions.
Connect and Pin 2 to the negative (-) terminal of a stable 12V power supply.