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故障现象一辆2009年产的一汽大众速腾轿车,行驶里程约为3.8万km,出现加速无力的故障。故障诊断接车后先试车。起动发动机,发动机怠速运行时,能感觉到有节奏的抖动;急加速时,发动机加速无力,同时发出“突突”的声音。连接VAS5052,进入发动机控制单元,读得的故障代码有P0300、P0302、P0303和P0304(图1),其含义为检测到多缸失火,以及2缸、3缸、4缸存在间歇性失火;查看发动机数据流,冷却液温度传感器、进气温度传感器、节气门位置传感器、氧传感器等信号均正常;查看数据组
Symptom An FAW-Volkswagen Sagitar sedan produced in 2009 has a mileage of about 38,000 km, resulting in weak acceleration. Troubleshooting after the first test car. Start the engine, the engine idling, you can feel rhythmic jitter; rapid acceleration, the engine acceleration weakness, while issued “sudden ” sound. Connected to the VAS5052 into the engine control unit, read the fault code P0300, P0302, P0303 and P0304 (Figure 1), which means that the detection of multi-cylinder fire, and 2, 3, 4 cylinder there is intermittent misfire; Engine data flow, coolant temperature sensor, intake air temperature sensor, throttle position sensor, oxygen sensor and other signals are normal; view data set