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故障现象一辆高尔夫A7车,搭载1.4TSI发动机,装配半自动空调系统,因空调系统不工作而进厂检修。故障诊断接车后试车验证故障现象,接通点火开关,发动机顺利起动;接通空调AC开关,空调控制面板上AC开关指示灯点亮(图1),但空调系统不工作(空调压缩机和鼓风机不工作)。根据试车结果进行分析,判断故障可能的故障原因有:制冷剂压力传感器(G805)故障;鼓风机控制单元(J126)故障;舒适系统CAN总线或空调系统LIN总线线路故障;空调控制单元(J301)本身
Symptoms A golf car golf, equipped with 1.4TSI engine, assembly semi-automatic air conditioning system, due to air conditioning system does not work into the factory overhaul. Fault diagnosis After the test car to verify the fault phenomenon, turn on the ignition switch, the engine started smoothly; connected AC switch air conditioning, air conditioning control panel AC switch indicator light (Figure 1), but the air conditioning system does not work (air conditioning compressor and Blower is not working). According to the test result analysis, determine the fault Possible causes of the malfunction are: refrigerant pressure sensor (G805) failure; blower control unit (J126) failure; comfort CAN bus or air conditioning system LIN bus line failure; air conditioning control unit (J301) itself