3516C and C175-16 Engines Selective Catalytic Reduction Caterpillar


SCR Module Differential Pressure Is High

Usage:

3516C LY6
使用此步骤对清洁排放模块(CEM)两端的压差高进行故障诊断与排除。 此压力是在 CEM 的发动机排气进口和处理后离开 CEM 的排气之间测得的。

表 1
J1939 代码和说明     CDL 代码和描述     注释    
4358-15
后处理 #1 SCR 催化器排气压差:高 - 最低严重程度(1)    
E942(1)
后处理 #1 SCR 催化器压差高    
记录该代码。
达到正确压力之前喷射不启用。    

可能原因

  • 代码

  • 排气系统

  • SCR 催化器

建议的措施

表 2
故障诊断与排除测试步骤     数值     结果    

1. 检查代码

A. 将 DC 断路器转到接通位置。

B. 在 Cat® 电子技师 (ET) 和电子控制模块 (ECM) 之间建立通信。

C. 查找与事件代码系统相关的现行代码。
   

代码
   

结果:存在除 E942 或 4358-15 以外的代码。

修理:在继续进行此测试前,诊断并排除所有相关代码。

结果:存在 E942 或 4358-15 代码。

转至测试步骤 2。
   

2. 目视检查排气系统有无损坏

A. 将 DC 断路器转到断开位置。

B. 目视检查排气系统 SCR 催化器出口和排气管出口之间有无损坏。
   

损坏
   

结果:排气系统上发现有损坏的部件。

修理:修理或更换损坏的部件。

确认修理后故障得到排除。 返回工作。

结果:排气系统上没有发现损坏。

如果故障未得到排除,则转至测试步骤 3。
   

3. 检查 SCR 催化器

A. 将 DC 断路器转到断开位置。

B. 检查 SCR 催化器的表面。

C. 检查 SCR 催化器表面上有无机油、燃油、尿素沉积物或烟尘堆积。
   

沉积物/堆积
   

结果:SCR 催化器表面有机油、燃油、尿素沉积物或烟尘堆积。

修理:更换损坏的催化器。 参考专门说明书, REHS9690, "有关配备有选择性催化还原(SCR)滤清器的大型发动机 Tier 4 Interim 和最终产品的后处理滤清器保养"了解 SCR 复位步骤。

关于机油,参考故障诊断与排除,, "排气系统含有机油"。

关于燃油,参考故障诊断与排除,, "排气系统含有燃油"。

关于尿素沉积物,参考故障诊断与排除,, "NOx 转换效率低"。

关于烟尘堆积,参考故障诊断与排除,, "排气过度冒黑烟"。

确认修理后故障得到排除。
   

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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