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故障现象一辆2008年产比亚迪F3轿车,仪表盘上的ABS灯(黄色)常亮。故障诊断用故障检测仪进行检查,发现ABS中存储有故障代码C0048——电子比例阀(DRP)失效和故障代码C0118——左后进油电磁阀相关故障。分析故障代码,推断故障代码C0048属于伴随性故障代码,故障代码C0118才是源故障代码,即只要排除故障代码C0018,故障代码C0048会同时消失。根据故障代码C0018含义并结合该车ABS控制原理(图1)进行分析,排除轮速传感器信号和制动开关信号存在故障的可能,将故障位置锁定在ABS控制单元和液压控制
Fault phenomenon A 2008 BYD F3 sedan, ABS lights on the dashboard (yellow) is always on. TROUBLE DIAGNOSIS TEST BY TROUBLESHOOTING TEST ABS found fault code C0048 - Electronic proportional valve (DRP) failure and fault code C0118 - Fault related to left rear oil solenoid valve. The fault code is analyzed to infer that the fault code C0048 belongs to the concomitant fault code. The fault code C0118 is the source fault code. That is, as long as the fault code C0018 is eliminated, the fault code C0048 will disappear at the same time. According to the meaning of fault code C0018 and the ABS control theory (Figure 1), the wheel speed sensor signal and brake switch signal are excluded from the analysis. The fault location is locked in the ABS control unit and the hydraulic control