Switch Circuits - Test
下表列出了与机器开关电路有关的诊断代码 (SPN)。
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机器 ECM (MID 39) | ||
---|---|---|
SPN-FMI | 代码说明 | 系统响应 |
70-2 | 停车制动器开关:数据不稳定、间歇或不正确 | 停用推进 |
导致 FMI 2 诊断代码的可能原因有:
- 机器运转时,导线间歇性对接地电路短路。
- 导线间歇性对蓄电池正极短路。
- 存在间歇性开路。
- ECM 出现故障。 ECM 故障不太可能。
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图 1 | g03864127 |
开关电路示意图 |
上图为机器 ECM 连接的简化示意图。 该示意图的电气部分都是正确的。 但是不能显示所有可能的线束接头。
有关本手册中的气动压路机的完整电气示意图,请参阅下文所列的相应媒体。
- 对于机器型号 (序列号: B7L),请参阅电气示意图, UCNR2688。
- 对于机器型号 (序列号: AL3),请参阅电气示意图, UCNR2417。
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"停车制动器开关"的触点闭合状态 | ||
开关位置 | 制动器功能 | LED 指示灯 |
接通 | 2 和 3 | 5 和 6 |
断开 | 2 和 1 | 5 和 4 |
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