G3500B Engines Caterpillar


Coolant Pressure Is High

Usage:

G3520B GLF
使用本步骤诊断和排除冷却液压力高故障,或者在以下事件代码为激活状态时使用本步骤。 关于事件代码的信息,请参阅故障诊断与排除, "事件代码"。 必须进入 Caterpillar 电子技师(ET)上的发动机监控系统才能查看这些代码的当前触发点。 关于发动机监控系统的信息,请参阅故障诊断与排除, "发动机监控系统"。

表 1
事件代码 
说明  激活代码的条件  系统响应 
E224(3) 水套水进口压力高关停  冷却系统压力升至编程延迟时间的触发点以上。  记录该代码。
停机输出启动。
发动机停机。 

可能原因

  • 冷却液压力开关的线束配线断路

  • 发动机冷却系统压力过大

建议的措施

冷却液压力开关线束配线断路(进口)

如果有 E224(3) 水套水进口压力高关停,电子控制模块(ECM)检测冷却液压力开关电路断路(进口)。 检查接线有无损坏或腐蚀。 请参阅故障诊断与排除, "电气接头 - 检查"。

如果发现电路接线有故障,根据需要,修理接线。

发动机冷却系统压力过大

水套水冷却液泵进口处的压力开关设计成在 462 ± 41 kPa (67 ± 6 psi) 压力时在端子 "B" 和 "C" 断路。 使用仪表检查缸体进口压力。

务必使用准确的仪表进行您的测量。 使用没有正确标定的仪表可能会导致错误的故障诊断。

如果压力低于 462 ± 41 kPa (67 ± 6 psi) 并出现 E224 事件代码,请更换压力开关。

如果在缸体进口处测量压力至少为 462 ± 41 kPa (67 ± 6 psi),可能由于水套水系统阻塞引起高压。 检查系统是否阻塞。 进行必要的修理。

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