Power Sources
简介（电源）
C4.4发动机向 ECM
供电。
ECM 向以下部件供电：
- 发动机上的所有传感器
- 喷油泵的电磁阀
- 废气旁通阀的电磁阀（可选）
- 诊断接头
- 电子单体喷油器
电热塞直接从蓄电池提供动力。
ECM 电源
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| 图 1 | g01336367 |
ECM 示意图 | |
ECM 和系统的电源来自 24 伏或 12 伏蓄电池。 ECM 电源具有以下部件：
- 蓄电池
- 断路开关
- 钥匙起动开关
- 保险丝
- 接地螺栓
- ECM 接头
- 机器接口接头
ECM 示意图显示了典型电源电路的主要组件。 蓄电池电压通常连接到 ECM。 钥匙起动开关的输入打开 ECM。
可以旁通配线线束用于故障诊断与排除。
显示屏幕上的电子服务工具可用以检查电压电源。
压力传感器电源
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| 图 2 | g01336369 |
压力传感器示意图 | |
ECM 通过ECM 接头向各传感器提供5.0 ± 0.2 伏直流电。 电源是防短路保护装置。 在传感器或配线线束短路不损坏 ECM。
电热塞的电源
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| 图 3 | g01360925 |
电热塞示意图 | |
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