Power Sources
发动机向 ECM 供电。 ECM 会向以下部件供电：
- 发动机上的所有传感器和清洁排放模块
- 氧化氮（NOx）传感器
- 喷油泵吸油控制阀
- 废气旁通阀电磁阀
- 诊断接头
- 电子单体喷油器
预热塞由蓄电池直接供电。
发动机 ECM 还控制 DEF 系统的电源。 发动机 ECM 不向系统供电。
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| 图 1 | g02423278 |
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典型示例 | |
ECM 和系统的供电来自 24 伏或 12 伏蓄电池。 ECM 的电源含有以下部件：
- 蓄电池
- 断路开关
- 点火开关
- 保险丝
- 接地螺栓
- ECM 接头
ECM 示意图显示了典型电源电路的主要部件。 蓄电池电压通常连接至 ECM。 来自点火开关的输入将会接通 ECM。
可以旁通导线线束来进行故障诊断与排除。
可以使用电子维修工具上的显示屏幕来检查电源电压。
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| 图 2 | g03710923 |
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压力传感器示意图 | |
ECM 通过 ECM 接头向各传感器提供 5 伏 VDC 电源。 电源具备短路保护功能。 在传感器或配线线束短路不损坏 ECM。
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| 图 3 | g02149319 |
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典型示例 | |
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| 图 4 | g03698495 |
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DEF 喷射控制系统示意图的典型示例 | |
Caterpillar Information System:
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