To scan the ECU for trouble codes or read live data parameters, you must hook up these lines to your OBD2 port or Mercedes 38-pin diagnostic connector. Pin Number / Signal Destination OBD2 Pin 7 / 38-Pin Connector Diagnostic Data Communication CAN-High Vehicle Network Bus High-Speed Powertrain CAN CAN-Low Vehicle Network Bus High-Speed Powertrain CAN 3. Essential Sensor Inputs (Engine Vital Signals)
I can provide the exact wiring color codes or chip modification steps for your specific goal. Share public link bosch me20 pinout verified
Before pinning the module, verify your hardware number on the ECU casing (e.g., Bosch part numbers starting with 0 261 20X XXX or Mercedes numbers like A 02X 545 XX XX ). The layout typically separates heavy-duty power and ground feeds from sensitive sensor inputs and data communication lines. Verified Pinout Data To scan the ECU for trouble codes or
Complete Bosch ME20 Pinout Guide (Verified ECU Wiring Diagram) Share public link Before pinning the module, verify
Fuel Injector Outputs (Ground-triggered for cylinders 1 through 6/8) Pin 9: Electronic Throttle Body Motor (+) Drive Pin 10: Electronic Throttle Body Motor (-) Drive Pin 14: Idle Air Control / Secondary Purge Valve Control
Plug A handles the heavy electrical current required to power up the internal microprocessor and driver circuits. Chassis Ground (Main) Pin 2: Chassis Ground (Secondary) Pin 7: Fuel Pump Relay Control (Ground-switched output) Pin 8: Engine Control Module Relay Control Pin 9: Constant +12V Battery Input (Fused) Plug B: Oxygen Sensors and CAN Bus Network
Attach your tool's K-Line communication lead to Plug 1, Pin 9 .