C27 and C32 Generator Set Engines Caterpillar


Intermittent Low Power or Power Cutout

Usage:

C27 2A3
注: 只能在发动机没有彻底停机时使用本步骤。

可能原因

  • 诊断代码

  • 事件代码

  • 油门信号

  • 电子控制模块(ECM)的电源

  • 燃油供给

建议措施

注: 如果故障只在某些情况下才出现的话,应在这些情况下测试发动机。 这些情况的例子有高发动机转速、满负载和发动机工作温度。 在其它情况下对故障现象进行故障诊断和排除会给出容易误导的结果。

诊断代码和事件代码

某些诊断代码和 / 或事件代码可能会造成发动机性能不良。 连接 Caterpillar 电子技师(ET),检查有无激活的代码和 / 或记录的代码。 继续进行本步骤之前,应对出现的任何代码进行故障诊断与排除。

油门信号

监测 Cat ET 上"油门位置"的状态。 确认"油门位置"状态保持稳定,发动机能达到高怠速转速。 请参阅故障诊断与排除, "转速控制 - 测试"以了解与油门信号电路的故障诊断与排除有关的信息。

ECM 电源

  1. 确保 ECM 接收到正确电压。 检查 ECM 与蓄电池之间的电路。 请参阅电气系统原理图。 检查电路中的电线、接头和部件。 请参阅故障诊断与排除, "电源电路 - 测试",以了解更多信息。

燃油供给

  1. 检查燃油管路有无以下故障:阻塞, 管路弯折 和 管路挤压 。 如果发现燃油管路有问题,应修理和 / 或更换管路。

  1. 检查燃油箱有无可能会堵塞供油的异物。

  1. 如果近期维修过以下任何部件,则应充注燃油系统:

    • 燃油滤清器

    • 低压供油回路

    • 单体喷油器

    注: 燃油低压供油管路上安装的观察孔有助于诊断燃油中的空气。 请参阅系统操作 / 测试和调整, "燃油混入空气 - 测试",以了解更多信息。

  1. 低温天气会对燃油特性带来不利影响。 请参阅操作和保养手册,以了解有关改善低温运作中燃油特性的信息。

  1. 检查发动机起动盘车过程中的燃油压力。 请参阅系统操作 / 测试和调整, "燃油系统",以了解正确的测试步骤。 如果燃油压力低于技术规格,更换燃油滤清器。 如果燃油压力仍低于技术规格,检查下列各项:燃油输油泵, 燃油卸压阀 和 燃油压力调节阀 。 请参阅系统操作 / 测试和调整,以了解更多信息。

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