故障现象一辆2003年生产的波罗1.4 L轿车,搭载BCC发动机,在某维修厂进行发动机大修后,出现怠速抖动的故障,由于该维修厂的维修人员一直找不到故障原因,因此向笔者求助。故障诊断接车后试车发现,EPC故障灯异常点亮,发动机怠速抖动,且转速偏高(1 200 r/min左右)。用故障检测仪进行检测,发现发动机控制单元内存储有故障代码 Fault phenomenon A 2003 Rolls-Royce 1.4L sedan, equipped with BCC engine, engine overhaul in a repair shop, the occurrence of idle jitter, the maintenance of the maintenance staff has been unable to find the cause of the malfunction, so to the author Help. Troubleshooting After the car was taken to the test, it was found that the EPC fault light was abnormally on, the engine idling jittered, and the speed was high (about 1 200 r / min). Detected with a fault detector and found that the engine control unit has stored a fault code