Road vehicles - Tachograph systems - Part 6: Diagnostics

This document specifies requirements and test methods for diagnostic functions of vehicle speed recorders. It covers aspects such as data recording, storage, retrieval, and integrity checks. The scope includes the definition of diagnostic capabilities, communication interfaces, and error handling procedures. It also addresses the requirements for the identification and classification of faults related to speed recording systems. The document is applicable to speed recorders used in road vehicles for various purposes, including but not limited to law enforcement, fleet management, and vehicle monitoring. It provides guidelines for the implementation of diagnostic features to ensure the reliability and accuracy of speed data. The content is structured to facilitate the integration of diagnostic functions into existing vehicle systems and to support the development of compatible components. This standard contributes to the overall performance and safety of vehicle speed recording systems by defining consistent and interoperable diagnostic procedures.