This connector links the ECU to the exhaust sensors and allows it to talk to other control modules like the Transmission Control Module (TCM) and ABS system. O2 Sensor 1 (Upstream Bank 1) Signal Pin 2: O2 Sensor 1 Ground Pin 6: CAN High (Data Bus communication line) Pin 7: CAN Low (Data Bus communication line) Pin 11: O2 Sensor 2 (Downstream Bank 1) Signal Plug C: Core Engine Sensors
This line links directly to Pin 7 of a standard OBD2 OBDII diagnostic port or your specific bench tool interface.
Pin numbering and availability may vary slightly between ME20.0 and ME20.1 variants and vehicle applications. Always verify your specific ECU part number and vehicle wiring diagram before making any connections. bosch me20 pinout verified
There are two main hardware variants:
: CAN-Low Network — Differential low-speed communication bus line. Diagnostic Step-by-Step Bench Testing Protocol This connector links the ECU to the exhaust
Main power distribution and system grounds. Plug B (Plug 2): Oxygen sensors and powertrain networks.
Note: Pin numbers can vary by specific hardware revision (e.g., the Opel E39 vs. Toyota variants). Always cross-reference with your specific ECU part number. Always verify your specific ECU part number and
To perform a full read or write (EEPROM/Flash) in boot mode, a specific boot pin must be grounded or connected via a resistor:
For flashing the ME20.1 ECU, you must put the ECU into boot mode. This is typically done by bridging the 12V line to Pin 5 on the 38‑pin diagnostic port and connecting the flashing tool (e.g., Kess V2, Galletto 1260).