故障现象一辆车型为UCF30的雷克萨斯LS430轿车,客户反映该车有时会出现发动机警告灯点亮故障,且同时还伴有发动机怠速运转发抖和行驶中加速无力的现象。故障诊断根据客户对故障现象的描述,笔者用故障检测仪进行检测,检测到的故障代码为P0353的历史故障代码,提示产生故障的原因是第3缸点火线圈一次侧或二次侧电路断路或短路,并显示详尽的定格数据(图1)。根据读得的故障代码分析,可能的故障原因有点火系统或第3缸点火线圈零部件损坏,点火系统的线束出现断路或短路,发动机电控单元(ECU)损坏。为此,笔者按以下步骤 Fault phenomenon A model for the Lexus LS430 sedan UCF30, the customer reflects the car may sometimes appear engine warning lights lit fault, and also accompanied by the engine idling tremor and driving acceleration weakness phenomenon. Fault diagnosis According to the customer description of the fault phenomenon, the author detected with a fault detector, the fault code detected as a fault code P0353, suggesting that the cause of the malfunction is the first 3-cylinder ignition coil primary or secondary circuit open circuit or Short-circuit, and display detailed freeze-frame data (Figure 1). According to the read fault code analysis, the possible causes of failure are ignition system or ignition coil components damaged cylinder 3, the ignition system wiring break or short circuit, the engine ECU damage. To this end, the author according to the following steps