依维柯卡车共轨喷油器DLLA157P1425

诊断方法：检查怠速控制阀的作动声音，若无作动声即怠速控制阀出现故障。

故障排除：清洗或业换怠速控制阀，并用对怠速转速进行基本设定。

3、进气管路漏气

故障分析：由发动机的怠速稳定控制原理可知，AVL GK在正常情况下，怠速控制阀的开度与进气量严格遵循某种函数关系，即怠速控制阀开度增大，进气量相应增加。进气管路漏气，进气量与怠速控制阀的开度将不严格遵循原函数关系，即进飞量随怠速控制阀的变化有突变现象，空气流量计此无法测出真实的进气量，造成ECU对进气量控制不准确，导致发动机怠速不稳。

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