故障现象一辆2014款新蒙迪欧轿车,搭载2.0T发动机和自动变速器,行驶里程约为5 000 km,因倒车影像系统不能正常工作而进厂检修。故障诊断接车后试车发现,该车的倒车影像系统为原厂配置,在变速器挡位挂入R挡后,8寸多功能显示屏上显示“相机不可用请联系经销商”(图1)。经询问驾驶人得知,该故 Symptom A 2014 Mondeo sedan with 2.0T engine and automatic transmission with a mileage of about 5 000 km was repaired due to inoperative camera system. Fault diagnosis After the car to test the car found that the car’s reversing imaging system for the original configuration, the transmission gear into R block, the 8-inch multi-function display shows “camera is not available, please contact the dealer ” (Figure 1). After asking the driver that the accident