ISO 15765 CAN Extended: Advanced OBD-II Communication

ISO 15765 CAN Extended is an enhanced version of the CAN (Controller Area Network) protocol, designed for OBD-II diagnostics and communication between electronic control units (ECUs) in vehicles. This standard enables data transmission using extended 29-bit identifiers, increasing flexibility and the number of available addresses for various modules.

How ISO 15765 CAN Extended Works

CAN Extended uses 29-bit identifiers to address messages between ECU modules. This extension allows:

  • A larger number of messages and modules in the vehicle
  • Precise addressing of critical systems
  • Real-time diagnostics and sensor monitoring

Data transfer speeds are typically 250 kb/s or 500 kb/s, ensuring efficient and reliable communication even in complex vehicles with multiple ECU units.

Launch OBD-II adapters that support the protocol:

DBScar I, DBScar II, DBScar III, DBScar IV, DBScar V, DBScar VII

ThinkDiag devices that support the protocol:

ThinkDiag, ThinkDiag 2

Ediag devices that support the protocol:

Ediag YA-101, Ediag YA-201, Ediag Plus, Ediag Elite

Vehicle types and brands supported by the protocol:

Passenger and light commercial vehicles from European, Japanese, and American manufacturers, including Volkswagen, Audi, BMW, Mercedes-Benz, Toyota, Honda, Nissan, Mazda, Ford, GM; models from around 2003 onward.

CAN Extended enables communication with ECU modules using a 29-bit identifier, often for advanced functions and complex vehicle systems.

Advantages of ISO 15765 CAN Extended

  • Provides higher capacity and flexibility in message addressing
  • Reliable real-time communication
  • Standardized for modern vehicles and OBD-II diagnostics
  • Supports reading and clearing DTC codes, sensor monitoring, and module testing
  • Ideal for vehicles with multiple electronic systems and complex networks

Disadvantages and Limitations

  • Requires diagnostic tools compatible with CAN Extended
  • More complex implementation compared to classic 11-bit CAN
  • Not compatible with older OBD-II serial protocols without adapters
  • Optimal operation requires correct ECU module configuration

Applications of ISO 15765 CAN Extended

This protocol is used for advanced diagnostics, ECU programming, sensor data monitoring, and module functionality testing. Its flexibility and reliability make it essential for diagnosing modern vehicles with complex electronic systems.

Conclusion

ISO 15765 CAN Extended represents an advanced standard for OBD-II communication, providing efficient, reliable, and precise diagnostics in vehicles with multiple ECU modules. Its extended addressing capability makes it indispensable for servicing and maintaining modern automobiles.