C9.3B Aftertreatment Systems Caterpillar


SCR Catalyst Sulfation Is Excessive

Usage:

D6 B72

表 1
J1939 代码和描述  CDL 代码和描述  注释 
7504-16
后处理 #1 SCR 系统硫酸盐化程度:高 - 中等严重程度 (2) 
N/A  SCR 催化剂的硫酸盐化作用超过可接受程度。 
7504-0
后处理 #1 SCR 系统硫酸盐化程度:高 - 最高严重程度 (3) 
N/A  SCR 催化剂的硫酸盐化作用超过可接受程度。 

表 2
相关代码 
N/A 

经过一段时间后,柴油中的硫堆积在 SCR 催化器上。 当过度硫酸盐化时,催化器丧失转化 NOx 的能力,导致排放偏高。

可通过执行再生清除催化器上沉积的硫。

温度要求保持最短持续时间后,脱硫处理完成,激活的代码将清除。

表 3
故障诊断与排除测试步骤  数值  结果 

1. 检查有无相关的代码

A. 连接至 Cat® 电子技师 (ET)。

B。 在执行任何故障诊断与排除或清除任何诊断代码前,从发动机 ECM 下载"保修报告"。

C. 确定是否存在表 2 中的相关代码。
 

相关代码
 

结果:不存在相关代码。

转至步骤 2。

结果:存在相关代码。

参考相应步骤对相应代码进行故障诊断与排除。

如果故障未得到排除,则转至测试步骤 2。
 

2. 执行"手动 DPF 再生"

注:必须通过 Cat ET 执行该测试。 Cat 电子技师维修工具可增强维修测试中的诊断功能。

A. 开始 "Manual DPF Regeneration(手动 DPF 再生)"。

注:运行本测试的次数不得超过两次。 在记录 7504-16 或 7504-0 时执行此操作可导致机油稀释。 如果需要连续运行测试两次以上。 在机器恢复工作前更换发动机机油。
 

"手动 DPF 再生"
 

结果:"手动 DPF 再生"成功。

将发动机重新投入使用。

结果:"手动 DPF 再生"失败。

对存在的所有其他诊断代码进行故障诊断与排除。
 

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