Exhaust Temperature Is High
使用本程序诊断和排除排气温度高故障，或者在以下事件代码为激活状态时使用本程序。 有关事件代码的信息，请参阅故障诊断与排除, "事件代码列表"。
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| 事件代码 | ||
|---|---|---|
| 代码和描述 | 产生此代码的状况 | 系统响应 |
| E194(2) 排气温度高 | ECM（Electronic Control Module，电子控制模块）计算出的排气温度高于触发点温度。 | 发动机减额。 将会记录该代码。 |
该事件激活表明 ECM 计算出高虚拟排气温度。 此温度以进气歧管温度、大气压力和发动机转速为系数，通过工况图计算而来。
高进气歧管空气温度、高海拔作业和高发动机负荷可造成排气温度升至过高，从而损坏排气阀和排气系统的其他部件。
该事件发生时，ECM 对发动机减额以降低排气温度。 这有助于避免排气系统部件损坏。
可能原因
- 发动机作业条件
- 后冷器
- 供至大气压力传感器的电源
建议的措施
发动机作业条件
对此诊断代码进行故障诊断与排除时，应考虑发动机进行高海拔作业。 高海拔作业导致生成此代码。 这是正常的。
可能的情况下与操作员交谈。 确定发动机是否在重负荷下运转。 确保发动机以正确的发动机转速运转。
后冷器
如果经过后冷器的流量受阻，可使进气歧管空气温度升高。 彻底检查后冷器是否堵塞。 确保有充足的空气或冷却液流量经过后冷器。
供至大气压力传感器的电源
如果大气压力传感器由 5 V 电源供电，则传感器输出可能在某一数值附近浮动，该数值作为高海拔条件由 ECM 解读。 ECM 接收错误的海拔数值并使发动机减额。 确保大气压力传感器线束接头存在 5 V 电源。
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