C3.4B Engines Caterpillar


Diesel Particulate Filter Temperature Is Low

Usage:

CD-44B 398
电子控制模块(ECM)监控柴油微粒滤清器(DPF)的进气温度。

可能原因

  • 诊断代码

  • 排气管上的绝缘层(如有配备)

  • 废气旁通阀

建议的措施

注: 下面以概率的先后顺序列出了这些步骤。 依次完成这些步骤。

表 1
故障诊断与排除测试步骤     数值     结果    

1. 诊断代码

A. 建立电子维修工具和电子控制模块 (ECM) 之间的通信。

B. 检查有无现行诊断代码。
   

代码
   

结果:激活或记录了故障诊断代码。

在继续进行此步骤之前,诊断并排除所有诊断代码。

结果:未激活或记录故障诊断代码。

转至测试步骤 2。
   

2. 排气管上的绝缘层(如有配备)

A. 检查发动机和清洁排放模块(CEM)之间排放管上的绝缘层。 确保绝缘层没有缺失或损坏。
   

隔垫
   

结果:绝缘层缺失或损坏。

修理或更换排气管上的绝缘层。

结果:绝缘层正常。

转至测试步骤 3。
   

3. 排气泄漏

A. 彻底检查发动机和 CEM 之间的排气管有无泄漏。 确保所有连接牢固且没有泄漏。
   

排气泄漏
   

结果:排气泄漏。

进行必要修理,并确认通过修理排除了故障。

结果:排气管正常。

继续测试步骤 4。
   

4. 废气旁通阀

A. 检查废气旁通阀是否正常工作。 请参阅系统操作、测试和调整, "涡轮增压器 - 检查"。
   

废气旁通阀
   

结果:废气旁通阀或废气旁通阀执行器故障。

安装替换用涡轮增压器。 请参考拆解和组装, "涡轮增压器 - 拆卸"和拆解和组装, "涡轮增压器 - 安装"。


结果:废气旁通阀和废气旁通阀执行器正常。

请联系代理商解决方案网络 (DSN)。
   

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