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故障现象一辆2009款海马福仕达车,车型为ZQ6380A62F,行驶里程为3万km。据驾驶人描述,该车发动机怠速过高,最高可达3 000 r/min,且不会下降。驾驶人还反映,该车曾经出现过蓄电池亏电而无法起动发动机的故障,于是用电动自行车的蓄电池(电动自行车蓄电池组电压为36V或48V)将发动机起动后,就出现上述故障现象。故障诊断试车发现,冷车起动后,发动机高怠速运转,但发动机电控单元在发动机起动后,一直控制发动机转速保持高怠速,导致转速过高(2000 r/min～3000 r/min)。同时发动机故障指示灯点亮。连接故障检测仪,读取故障
Symptoms A 2009 Hippocampus Fu Shida car, model ZQ6380A62F, mileage of 30,000 km. According to the driver description, the engine idle speed is too high, up to 3000 r / min, and will not decline. The driver also reflects the car had a battery power failure and can not start the engine failure, so with the electric bicycle battery (electric bicycle battery voltage of 36V or 48V) will be the engine start, the above symptoms. After the cold start, the engine runs at high idle speed. However, after the engine starts, the engine electronic control unit keeps controlling the engine speed to maintain high idle speed, resulting in high speed (2000 r / min ~ 3000 r / min). At the same time the engine fault indicator light. Connect the fault detector, read the fault