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故障现象一辆行驶里程约为7.4万km的2013款宝马525Li车(配备N20发动机),客户反映该车起动困难(与平时相比,起动时间偏长),并且有时还会自动熄火,同时发动机故障灯点亮。该车故障频率不是很高,且无规律性。故障诊断连接故障检测仪(IS TAD),读取故障代码,故障代码显示燃油高压压力过低故障。根据故障代码提示,需要检测燃油低压系统压力是否符合要求。连接燃油压力表,燃油低压系统油压为500 k Pa(查看
Problem A BMW 525Li (with N20 engine) driving about 74,000 km traveled, the customer reported that the car was difficult to start (longer start-up time than usual) and sometimes auto-off, while the engine Fault light is on. The car failure frequency is not high, and no regularity. Fault diagnosis Connect the fault detector (IS TAD), read the fault code, the fault code shows the fuel pressure is too low fault. According to the fault code prompts, the need to detect the pressure of the fuel low-pressure system meets the requirements. Connecting the fuel pressure gauge, the fuel low pressure system has a hydraulic pressure of 500 kPa (see