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车型:F18,配置N20发动机。行驶里程:240000km。故障现象:客户进厂反映车子在怠速情况下抖动。维修人员试验故障时发现一个奇怪的现象,车子在启动后便开始抖动(不论冷车或热车),当原地急加速后,抖动现象便消失,试车行驶过程中一切正常且未出现抖动现象。故障诊断:连接宝马诊断仪读取故障码如图1所示。读取故障时数据流如图2所示。导致空气流量传感器数据流变大
Model: F18, equipped with N20 engine. Mileage: 240000km. Symptom: The customer into the factory to reflect the car jitter at idle. A strange phenomenon was observed in maintenance personnel’s test failure. The car began to shake after start-up (whether cold or hot). When the car accelerated rapidly, the jitter disappeared. During the test run, everything went normal and no jitter occurred . Fault diagnosis: connect BMW diagnostic device to read the fault code shown in Figure 1. When reading the fault data flow shown in Figure 2. As a result, the air flow sensor data flow becomes larger