故障现象一辆2008款进口大众辉腾车,行驶里程约为14.3万km,搭载型号为BTT的6.0 L发动机和01L 5速自动变速器。据驾驶人反映,车辆仪表盘上的挡位显示不正常。故障诊断接车后试车验证故障,接通点火开关,起动发动机,发动机能顺利起动,操作换挡杆,能正常切换挡位,车辆能够正常行驶,但仪表盘上的挡位显示区域内各挡位的背景均为黄色(图1),挡位显示确实不正常。经过反复试车,维修人员还发现,在点火开关接 Symptom A 2008 imported Phaeton cars, mileage of about 143,000 km, equipped with models for the BTL 6.0L engine and 01L 5-speed automatic transmission. According to the driver reflected, the gear on the vehicle dashboard display is not normal. Fault diagnosis After the test car to verify the fault, turn on the ignition switch, start the engine, the engine can start smoothly, the shift lever operation, the normal shift gear, the vehicle can travel normally, but the instrument on the gear display area of ​​each gear Bit background are yellow (Figure 1), gear display is not normal. After repeated testing, maintenance personnel also found that the ignition switch