Overview
ISO 14229-6:2013 - titled "Road vehicles - Unified diagnostic services (UDS) - Part 6: Unified diagnostic services on K‑Line implementation (UDSonK‑Line)" - specifies how a subset of the UDS diagnostic services (ISO 14229) are implemented over a K‑Line (UART‑based) diagnostic link (DoK‑Line). It defines implementation requirements for diagnostic communication, session/transport adaptations, and server non‑volatile memory programming for in‑vehicle ECUs accessed by external test equipment. ISO 14229‑6 focuses on K‑Line‑specific requirements and restrictions and intentionally references ISO 14229‑1, ISO 14229‑2, ISO 14230‑1 and ISO 14230‑2 rather than duplicating them. It does not mandate in‑vehicle K‑Line bus architecture.
Key topics and technical requirements
- Scope of UDS on K‑Line: Defines which UDS services (subset of ISO 14229‑1) apply to K‑Line and notes services that are not supported.
- OSI layer mapping: Adapts UDS application and session services to the DoK‑Line transport and data‑link layers (see clauses on application, presentation, session, transport/network interface and data link).
- Application layer rules: Service and subfunction parameter definitions, handling of the suppressPosRspMsgIndicationBit and P2/P2* timing considerations.
- Transport & data link adaptation: Interface requirements to ISO 14230‑2, rules for data segmentation/reassembly, session handling and error handling over K‑Line.
- Timing and protocol control: Application and session layer timing, protocol initialization/stop, and specific timing constraints for DoK‑Line.
- Server memory programming: Requirements for non‑volatile server memory programming (ECU programming) over K‑Line with external test equipment.
- Restrictions & implementation notes: Additional K‑Line specific constraints (e.g., message length limits due to data link) and guidance to avoid redundant content already covered by referenced standards.
Applications - who uses it
ISO 14229‑6 is intended for:
- Vehicle manufacturers (OEMs) and system architects implementing UDS on legacy K‑Line networks
- ECU and embedded software suppliers who need K‑Line UDS behavior and memory‑programming support
- Diagnostic tool, scan tool and test equipment vendors implementing DoK‑Line communication stacks
- Aftermarket diagnostic and service engineers who require compliance with UDSonK‑Line for ECU communication and reprogramming
Practical uses include ECU diagnostics, fault code read/clear, data read/write by identifier, and non‑volatile memory programming over K‑Line links.
Related standards
- ISO 14229‑1 (UDS specification and requirements)
- ISO 14229‑2 (UDS session layer services)
- ISO 14230‑1 / ISO 14230‑2 (Diagnostic communication over K‑Line - physical and data link layers)
- Other ISO 14229 parts: UDSonCAN (Part 3), UDSonFR (Part 4), UDSonIP (Part 5), and planned UDSonLIN (Part 7)
Keywords: ISO 14229‑6, UDSonK‑Line, Unified Diagnostic Services, K‑Line, DoK‑Line, vehicle diagnostics, ECU programming, diagnostic communication.