C3.4B Engines Caterpillar


Intake Manifold Air Pressure Is High

Usage:

CD-44B 398
此步骤涉及以下诊断代码:

表 1
进气歧管空气压力偏高的诊断故障代码    
J1939 代码     说明     备注    
1127-16     发动机涡轮增压器 1 增压压力:高 - 中等严重程度(2)     电子控制模块(ECM)检测到实际进气歧管空气压力比需要的进气歧管空气压力大
50 kPa (7.25 psi) 持续至少 10 秒钟。

如有配备,警告灯将闪烁。 发动机将减额。

如果实际进气歧管压力在需要的进气歧管空气压力的
25 kPa (3.6 psi) 范围内至少 11 分钟,则代码将复位。    

可能原因

  • 进气和排气阻塞

  • 涡轮增压器废气旁通阀

  • 废气旁通阀调节器

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 2
故障诊断与排除测试步骤     数值     结果    

1. 进气和排气阻塞

A. 检查空气滤清器有无损坏。

B. 检查进气和排气系统有无阻塞和/或漏气。 请参阅系统操作、测试和调整, "进气和排气系统 - 检查"。
   

进排气系统    

结果:进气或排气系统中发现有缺陷。

修理所有缺陷。 更换损坏的部件。

结果:进气和排气系统正常。

转至测试步骤 2。
   

2. 涡轮增压器废气旁通阀

A. 检查涡轮增压器废气旁通阀的操作。

B. 检查废气旁通阀执行器的操作情况。 请参阅系统操作、测试和调整, "涡轮增压器 - 检查"。
   

涡轮增压器废气旁通阀
   

结果:废气旁通阀或废气旁通阀执行器可能有故障。

更换涡轮增压器。 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操作正常。

转至测试步骤 3。
   

3. 废气旁通阀调节器

A. 使用电子维修工具检查废气旁通阀调节器相关故障诊断代码。
   

废气旁通阀调节器
   

结果:存在废气旁通阀调节器相关诊断代码。

排除任何相关代码的原因。 请参阅故障诊断与排除, "故障诊断代码"。

结果:没有废气旁通阀调节器相关诊断代码。

请联系代理商解决方案网络 (DSN)。
   

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