Abstract: In contemporary automotive diagnostics, technicians and engineers predominantly rely on a two-pronged approach involving fault code retrieval via diagnostic tools and subsequent analysis of controller area network (CAN) bus signals to identify malfunction sources. However, this conventional methodology frequently results in operational inefficiencies. To address this challenge, this study presents an innovative rapid fault diagnosis framework for vehicle controler. First, an automotive open system architecture (AUTOSAR) compliant fault diagnosis application layer architecture is systematically designed for controllers. Second, a novel fault codes displayed in a loop is developed, enabling controller to autonomously broadcast detected fault identifiers through the vehicular CAN network at configurable intervals. Finally, the system's efficacy is rigorously validated using hardware-in-the-loop (HIL) simulation platforms. Experimental results demonstrate that this optimized diagnostic scheme eliminates the time-consuming process of manual signal correlation analysis based on control logic principles. The implementation significantly accelerating both R&D debugging cycles and maintenance operations. This research establishes a methodological foundation for next-generation intelligent fault diagnosis systems in automotive embedded controllers.

Key words: vehicle controller; diagnosis; fault codes displayed in a loop; HIL

摘要： 目前汽车研发及维修人员普遍采用读取诊断仪故障码与分析相关控制器局域网（CAN） 总线控制信号相结合的方案来分析汽车故障原因，但该方案会导致工作流程较繁琐且效率低 下问题。为解决此问题，文章新提出了一种车载控制器快速故障诊断方案。首先，对基于汽 车开放系统架构（AUTOSAR）开发的控制器设计了故障诊断应用层软件架构；其次，设计了 一种故障循环显示码算法，可让控制器往汽车 CAN 总线上发送检测出的故障显示代号；最后， 采用硬件在环（HIL）仿真系统对新方案及算法进行了验证。结果表明，此快速诊断方案节省 了研发人员根据控制原理或逻辑来逐条分析相关信号的时间，加快了研发调试或维修服务速 度，为控制器故障诊断功能开发提供了一种新方法。

关键词: 车载控制器；诊断；故障循环显示码；硬件在环