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故障现象一辆苏州金龙客车,搭载玉柴YC6J210N-40压缩天然气(CNG)单一燃料发动机,行驶里程约为4.6万km。在事故修复后,出现发动机无法起动着机的故障现象。故障诊断接车后试车验证故障,接通点火开关,尝试起动发动机,起动机工作正常,但发动机无法起动着机。此外,维修人员发现在整个试车过程中发动机故障灯均不亮(正常情况下,在系统自检时应常亮约3 s后熄灭)。断开点火开关,连接故障检测仪后接通点火开关至ON位,发现故障检测仪无法与系统进行通讯。
Fault phenomenon A Suzhou Jinlong bus carrying Yuchai YC6J210N-40 compressed natural gas (CNG) single-fuel engine, mileage of about 46,000 km. After the accident repaired, there was a problem that the engine could not start up. Troubleshooting After the test car to verify the fault, turn the ignition switch, try to start the engine, the starter is working properly, but the engine can not start the machine. In addition, the maintenance personnel found that the engine failure lights were not bright during the whole test (under normal circumstances, the system should be off for about 3 seconds after self-test). Turn off the ignition switch, connected to the fault detector after the ignition switch to the ON bit and found fault detector can not communicate with the system.