Crankcase Pressure Is Low
本步骤涉及以下诊断故障代码:
注: 以下代码可能不适用于特定的应用。
在执行以下步骤之前,使用 Cat 电子技师清除所有"现行"代码。 参考故障排除, "诊断能力 - 清除现行机载诊断(OBD)代码"以了解关于清除"现行"代码的更多信息。
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诊断故障代码     | |||
---|---|---|---|
CDL 代码     | J1939 代码     | 说明 (代码说明可能不同)     |
注释     |
E994(2)     |     | 曲轴箱压力低     | 当曲轴箱压力已低于最小值达到编程设定的时间长度时,发动机控制模块(ECM)激活此代码。 黄色警告灯会点亮。 记录该代码。 发动机功率减额。     |
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图 1 | g02211761 |
典型的曲轴箱通风系统 (1) 曲轴箱压力传感器 (2) 通气孔 (3) 滤清器壳体 (4) 烟气处理管 |
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图 2 | g02013955 |
发动机左侧 (5) 单向阀 |
可能原因
- 机油加注口盖关闭。
- 油位表(油尺)未完全座合。
- 未安装曲轴箱通气滤清器。
- 通气孔和通气孔滤罐之间的管未连接。
发动机配有开式曲轴箱通风系统。
建议的措施
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故障排除测试步骤     | 数值     | 结果     |
---|---|---|
1. 发动机通风 A. 建立 Caterpillar 电子技师(ET)和 ECM 之间的通信。 如有必要,参考故障排除, "电子维修工具"。 B. 在执行任何故障排除或清除诊断故障代码前,从发动机 ECM 下载"保固报告"。 C. 检查发动机。 查看有无以上列出的情况。     |
通风     |
结果:找到了可能的原因。 进行必要的修理。 复位所有现行代码并清除所有记录的代码。 利用 Cat 电子技师确认故障已排除。     |
按所列步骤顺序完成以上步骤。
如果以上步骤未解决问题,请联系当地 Cat 代理商的技术通信员(TC)。 如需进一步的帮助,您的 TC 可以通过代理商解决方案网络(DSN)与您交谈。
Caterpillar Information System:
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