At the same time how to read the blooey code of common automobile styles are introduced before using OBD-II. Secondly author described the main function of OBD-II in detail. At last, the challenge and development of OBD-II are studied and discussed .

• 文中首先简要介绍OBD车载诊断系统的发展历程,并给出了在采用车载故障诊断系统(OBD-II)统一故障诊断系统之前常见车型利用短接诊断座端子读取故障码的方法,然后详细叙述了OBD-II的主要功能、统一的故障码及其意义、OBD-II冻结框架和失效记录诊断、OBD-II读取状态和氧测试,以及OBD-II的测试循环及其优点。