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5. Timing Parameters (Key for Implementation)
- Service IDs (SIDs): One-byte identifiers for each UDS service (e.g., DiagnosticSessionControl, ReadDataByIdentifier, RoutineControl).
- Positive and negative responses: Standard response formats with response codes and Negative Response Codes (NRCs).
- Diagnostic sessions: Different sessions (default, programming, extended) that enable/disable services and access levels.
- Security/access control: Seed–Key challenge–response mechanisms for unlocking protected services.
- Data identifiers (DIDs): IDs used to read/write ECU data.
- Routines: Predefined sequences for tasks like calibration or flashing (RoutineControl service).
- Timing and response timing: P2/P2* timing parameters and response timeouts.
- Transport mapping: How UDS messages are segmented and sent over lower-layer protocols (e.g., ISO-TP on CAN).
ISO 14229-3
In the fast-paced world of automotive engineering, (often referred to as UDSonCAN ) is the essential "playbook" that allows a diagnostic tool to speak the same language as a car’s brain.
ISO 14229-3:2022
The latest version, , replaced the original 2012 edition. Key updates include:
ISO 142293 PDF: A Complete Guide to Accessing, Understanding, and Implementing the Standard
: Clearly define what systems the document covers (e.g., specific vehicle ECUs) and the diagnostic objectives. Normative References
Network Management
: Covers how diagnostic sessions are managed over CAN, including timing constraints and error handling.