故障现象一辆2009款长安福特蒙迪欧致胜车,搭载2.3 L发动机和6速自动变速器,行驶里程约为10万km,因事故在某汽车修理厂维修后出现转向沉重并伴有异响的现象。故障诊断试车验证故障,故障现象确实存在,初步判断故障点在转向系统。据驾驶人反映,该车已先后更换了转向助力泵、转向器、转向助力油管及转向助力油储油罐,但始终无法排除故障。于是首先对车辆进行常规检查,发现转向助力油油面位于标准刻度线以下。蘸取转向助力油查看,未见明显异常。随 Symptom A 2009 Changan Ford Mondeo winning car with a 2.3 L engine and a 6-speed automatic transmission had a mileage of about 100,000 km. After a car repair shop was repaired, it turned heavy and accompanied by abnormal sound. Fault diagnosis test to verify the fault, the fault phenomenon does exist, the initial fault point in the steering system. According to the driver, the car has successively replaced the steering booster pump, the steering gear, the steering booster pipe and the steering booster oil tank, but it failed to eliminate the fault. So the first routine inspection of the vehicle and found that steering power oil surface is located below the standard tick mark. Dipped steering power oil to see, no obvious abnormalities. With