故障现象一辆帕萨特1.8T轿车,累计行驶23万km,出现怠速抖动,行驶发冲,有时停放一夜后就无法起动着机的故障。在本市几家修理厂进行了多次修理.故障一直没能排除。故障分析与排除首先用VAS5051调取故障代码,调得了3个偶发性故障:17953——节气门控制单元有故障;17939——进气门轴控制电路断路;16500——冷却液温度传感 Fault phenomenon A Passat 1.8T sedan, total travel 230,000 km, there idling jitter, driving hair red, sometimes parked overnight failed to start the machine fault. Several repair shops in the city have done a lot of repairs. The failure has not been ruled out. Fault Analysis and Removal First of all, with the VAS5051 call fault code, transferred to three occasional fault: 17953 - throttle control unit fault; 17939 - intake valve shaft control circuit open; 16500 - coolant temperature sensing