Catalytic Converter Has High Differential Temperature
按照此步骤对催化转化器上的高温差进行故障诊断和排除。 此外,如果以下任一诊断代码为激活状态的话,应使用本步骤。 请参阅故障诊断与排除, "诊断故障代码"以了解有关诊断故障代码的信息。 进入 Caterpillar 电子技师(ET)上的发动机监控系统以查看这些发动机代码的当前触发点。 关于发动机监控系统的信息,请参阅故障诊断与排除, "发动机监控参数"。
Show/hide table
发动机事件     | ||
J1939 代码和说明     | 产生代码的状况     | 系统响应     |
4779-0 后处理 #1 三向催化气体温差:高 - 最严重(3)     | 催化转化器上的温差已超过编程设定的延迟时间触发点。     | 记录该代码。 红色停机灯点亮。 发动机停机。     |
4779-15 后处理 #1 三向催化气体温差:高 - 最轻微(1)     | 记录该代码。 黄色报警指示灯会点亮。 |
可能原因
- 发动机正时不正确
- 发动机缺火
建议的措施
发动机正时不正确
发动机正时过度延迟会影响排气温度和冷却液温度。
发动机起动期间,将会自动标定此发动机的点火正时。 如果怀疑正时标定有故障,请参阅故障诊断与排除, "转速/正时 - 测试"了解更多信息。
核实正时编程设定正确。 请参阅系统操作, "系统配置参数",了解有关设定正时参数的信息。
发动机缺火
发动机缺火会让未燃烧气体进入排气系统。 过量气体可能在催化转化器的进口处燃烧。 这将导致催化转化器的进口处排气温度过高。
检查发动机有无缺火状况。 详情请参阅故障诊断与排除, "发动机缺火、运转粗暴或不稳定"。
Caterpillar Information System:
824K Wheel Dozer, 825K Soil Compactor and 826K Landfill Compactor Machine Systems Modulating Valve (Torque Converter Lockup Clutch)
Maintaining the Protective Structure (ROPS/FOPS) Certification when Making Modifications To (ROPS/FOPS) {7323, 7325, 7715} Maintaining the Protective Structure (ROPS/FOPS) Certification when Making Modifications To (ROPS/FOPS) {7323, 7325, 7715}
C7.1-XQ230 Rental Generator Set Turbocharger - Inspect
3600 Distillate Fuel Engines Fluid Recommendations
CG137-08 and CG137-12 Industrial Engines Catalytic Converter Pressure - Test
3516C Locomotive Engines Aftercooler - Remove and Install
C9.3 Industrial Engine and CX31-P600-C9I Petroleum Power Train Package Diesel Particulate Filter - Clean/Replace
826K Landfill Compactor Diesel Particulate Filter - Clean - Emission Related Component
C6.6 Industrial Engine Maintenance Interval Schedule
2011/02/02 New Software is Now Used on Current Production C9, C11, C13, C15, C18, and Certain C27 Industrial Engines {1901, 1920}
Reconditioning Dimensions for Carrier Rollers {4154, 4180} Reconditioning Dimensions for Carrier Rollers {4154, 4180}
3600 Distillate Fuel Engines Metal Particle Detector - Inspect/Clean
CG137-08 and CG137-12 Industrial Engines Catalytic Converter Has High Inlet Temperature
CG137-08 and CG137-12 Industrial Engines Exhaust Bypass Valve
Cat® Grade Control Depth & Slope for E-Series and F-Series Excavators Operator Controls
UPSB505 Uninterruptible Power Supply UPS Personalization
3516C and C175-16 Engines Selective Catalytic Reduction Diagnostic Trouble Codes
3516C Locomotive Engines Auxiliary Water Pump - Remove
Basic Principles of Kidney Loop Filtering Hydraulic Fluid Systems {0680, 0768, 5050, 5056} Basic Principles of Kidney Loop Filtering Hydraulic Fluid Systems {0680, 0768, 5050, 5056}
Filtration Procedure for Kidney Looping Off-Highway Truck Steering Oil {0680, 4300, 4332, 5050, 7542} Filtration Procedure for Kidney Looping Off-Highway Truck Steering Oil {0680, 4300, 4332, 5050, 7542}
3612 and 3616 Fast Vessel Engines Maintenance Interval Schedule
3516C Locomotive Engines Auxiliary Water Pump - Install
3612 and 3616 Fast Vessel Engines Maintenance Interval Schedule
2011/08/10 New Line Relief Valves are Now Used for Certain Excavators and Mobile Hydraulic Power Units {5069, 5117}