C15 and C18 Engines for China On-Highway Phase IV Caterpillar


Crankcase Pressure Is Low

Usage:

C18 BE2
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。

表 1
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。    



图 1g02211761

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




图 2g02013955

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

表 2
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。

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