: CAN-Bus (High/Low) and K-Line pins used for OBD-II diagnostics and ECU remapping. Bosch Repair Service Typical Wiring Categories Common Pin Labels Description +12V, GND, VCC Main power and reference voltages. MAP, MAF, CTS 0-5V signals from engine sensors. Digital In Crankshaft/Camshaft position frequency signals. CAN-H, CAN-L High-speed data exchange with other modules. Usage and Safety Verification
Before analyzing the pins, one must identify the ECU family. Bosch naming conventions dictate the architecture of the pinout. Bosch Ecu Pinout Datasheet
These are the most critical pins. If these are misidentified, the ECU will not power on, or worse, it may short-circuit. : CAN-Bus (High/Low) and K-Line pins used for