论文部分内容阅读
案例1卡罗拉轿车发动机无法起动故障现象一辆卡罗拉轿车,行驶里程为6.7万km,出现发动机无法起动的故障。故障诊断接车后首先检查蓄电池电压,为12.8 V,正常。检查主继电器,正常;拆下喷油器的连接器,用专用测试二极管检查喷油器的喷油信号,无喷油信号;检查点火系统,火花塞不跳火;检查防盗系统,正常;连接故障检测仪,无法进入该车自诊断系统。对上述检测结果进行分析,推断故障的原因为发动机ECU工作异常。
Case 1 Corolla car engine can not start Symptom A Corolla sedan, mileage of 67,000 km, the engine fails to start the fault. Troubleshooting After the car first check the battery voltage, 12.8 V, normal. Check the main relay, normal; remove the injector connector, with a dedicated test diode injector fuel injection signal check, no fuel injection signal; check the ignition system, the spark plug does not jump over; check the anti-theft system, normal; connection failure Detector, unable to enter the car self-diagnosis system. The above test results were analyzed to infer the cause of the malfunction of the engine ECU is abnormal.