C175-16 Locomotive Engine Caterpillar


ECM Does Not Communicate with Other Modules

Usage:

C175-16 3A9

可能原因

  • 电子控制模块(ECM)

  • 数据链路通信

  • 电气接头和导线

建议的措施

表 1
故障诊断与排除测试步骤  数值  结果 

1. 检查 Caterpillar 电子技师 (ET) 和 ECM 之间的通信

A. 将 Cat 电子技师连接到维修工具接头上。

B. 恢复 ECM 的电源。

C. 在 Cat 电子技师和 ECM 之间建立通信。
 

ECM 

结果 Cat ET 和 ECM 之间建立通信。

ECM 工作正常。

转至下一步。

结果 Cat ET 不与 ECM 通信。

有关对此故障进行故障排除的相关信息,转至故障诊断与排除, "电子维修工具无法进行通信"。
 

2. 检查数据链路通信

A. 确认通信通过 Cat 数据链路和 CAN 数据链路进行,如适用。
 

数据链路 

结果:数据链路发现故障。

修理:执行任何必要的修理。 如果怀疑通过数据链路进行的通信有故障,请参考故障诊断与排除, "数据链路 - 测试"。

如果故障未得到排除,转至下一步骤。
 

3. 检查电气接头和配线

A. 断开 ECM 的电源。

B. 有关检查线束和接头故障的信息,转至故障诊断与排除, "电气接头 - 检查"。
 

接头 

结果:线束和接头正常

结果:接头和/或配线有故障。

修理:对接头和/或导线执行必要的修理。
 

4. 钥匙开关电源

A. 确保应用上的所有模块都接收到了钥匙开关电源。

B. 有关对发动机钥匙开关电路进行故障诊断与排除的信息,转至故障诊断与排除, "供电电源 - 测试"。
 

功率
 

结果:向所有模块提供钥匙开关电源。

结果:钥匙开关电源有故障。

修理:对钥匙开关和/或模块执行必要的修理。

如果故障未排除,请咨询您的技术通信员 (TC) 获取进一步说明。
 

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