: CAN High/Low and K-Line for OBD-II diagnostics and ECU flashing.
When working with Bosch pinout datasheets, relying on a single source is professional malpractice. Datasheets are often transcribed incorrectly in aftermarket manuals. The "Triple-G" method ensures accuracy: Bosch Ecu Pinout Datasheet
What is the exact on the ECU sticker (usually a 10-digit number starting with 0 261 ... or 0 281 ... )? What make, model, and year of vehicle is this engine from? : CAN High/Low and K-Line for OBD-II diagnostics
: Typically starts with 0 281 (for diesel/EDC) or 0 261 (for gasoline/ME) and is 10 digits long. Bosch Ecu Pinout Datasheet
Looking directly at the exposed male pins inside the metal ECU header.