Fuel Rail Temperature Is High
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图 1 | g02794262 |
高压燃油温度传感器的位置(高压燃油泵视图) |
采用此步骤对燃油温度高进行故障排除。 此外,如果以下任一事件代码为激活状态,应使用本步骤。 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"。
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事件代码     | ||
---|---|---|
CDL 代码和描述     | 产生此代码的状况     | 系统响应     |
E770(1) 燃油轨温度高     | 高压系统的燃油温度高于已编程延长时间的触发值。     | 记录该代码。     |
E770(2) 燃油轨温度高     | 记录该代码。 发动机功率将会降额。 |
|
E770(3) 燃油轨温度高     | 记录该代码。 发动机停机。 |
如果因燃油温度高关闭发动机,循环至发动机电控模块(ECM)的电源,以便重启。
可能原因
- 诊断代码和事件代码
- 燃油温度传感器
建议的措施
诊断代码和事件代码
将 Cat(ET)连接到维修工具接头上。 检查有无激活的诊断代码和事件代码。
查找有无关于高压燃油系统和低压燃油系统的现行和记录的诊断代码和事件。 继续之前,使用适当的电路测试方法诊断和排除激活的代码。
使用记录事件的时间标记来确定事件激活的时间。 采取以下措施:
如果 E363 随 E770 一起激活,则低压燃油系统正在向高压泵输送高温燃油。 高供油温度可提高高压燃油温度,使其足以触发 E770 代码。 对低压燃油系统的现行 E363 代码进行故障排除。 当低压燃油系统的故障被排除时,重新检查发动机有无 E770 事件。
如果 E770 激活但 E363 没有激活,则表明高压燃油泵有故障。 更换高压燃油泵和边缘滤清器。
燃油温度传感器
使用 Cat ET 监控"燃油温度"和"燃油轨温度"参数。 确保所有这些状态参数的值都是合理的。
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