故障现象一辆2011款雷诺纬度车采用M4R发动机和无级变速器,累计行驶里程约为5.7万km。据客户反映,该车在交车3个月后就出现空调不出风的故障,来店维修过两次,但故障依旧。故障诊断笔者接到该车后,首先验证故障的现象,确实如客户所述。用雷诺专用检测仪CLIP对该车进行检查,在空调ECU中调得的故障代码为912909(图1),其含义为乘 Symptoms A 2011 Renault latitude car with M4R engine and continuously variable transmission, the cumulative mileage of about 57000 km. According to the customer, the car appeared in the car after 3 months the air conditioning is not the wind failure to shop maintenance twice, but the fault still. Troubleshooting I received the car, the first to verify the phenomenon of failure, indeed, as the customer said. CLIP with the Reno dedicated tester for the car to check the air conditioning ECU tune in the fault code 912909 (Figure 1), the meaning of multiplication