C4.4 and C7.1 Engines Caterpillar


Coolant Level Is Low

Usage:

525D 2L5
此步骤仅适用于带冷却液液位传感器的发动机。

此步骤涉及以下诊断代码:

表 1
冷却液液位低故障诊断代码 
J1939 代码  CDL 代码  代码说明
(代码说明可能不同) 
注释 
111-1  E2143-3  发动机冷却液液位:低 - 液位 3  发动机已运行 60 秒。 发动机冷却液液位降至冷却液液位传感器以下已达到规定的延迟时间。
发动机功率减额。 记录该代码。 
111-18  E2143-2  发动机冷却液液位:低 - 液位 2  发动机已运行 60 秒。 发动机冷却液液位降至冷却液液位传感器以下已达到规定的延迟时间。
发动机功率减额。 记录该代码。 

可能原因

  • 冷却液液位低和/或冷却液泄漏

  • 冷却液液位传感器

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. 冷却液液位低和/或冷却液泄漏

A. 检查冷却液液位。
 

冷却液液位
 

结果:发动机冷却液液位正常。

转至测试步骤 2。

结果:发动机冷却液液位不正常。

修理:对冷却液液位不当的原因进行故障诊断与排除。

检查防冻液和水的混合是否正确。 参考操作和保养手册。

检查冷却系统有无泄漏。 参考系统操作/测试和调整, "冷却系统 - 测试",以了解正确的步骤。 立即修理所有泄漏。

检查冷却系统中有无空气。 参考系统操作/测试和调整, "测试冷却系统",以了解正确的步骤。
 

2. 传感器有故障

A. 如果怀疑冷却液液位传感器存在电气故障,请参阅故障诊断与排除, "冷却液液位 - 测试",了解有关冷却液液位传感器的故障排除信息。
 

冷却液液位传感器
 

结果:冷却液液位传感器工作异常。

修理:更换冷却液液位传感器。

结果:冷却液液位传感器工作正常。

请联系代理商解决方案网络 (DSN)。
 

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