CW34 Pneumatic Compactor Machine Electronic Control System Caterpillar


Switch Circuits - Test

Usage:

CW34 3G4

机器 ECM

下表列出了与机器开关电路有关的诊断代码 (SPN)。

表 1
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。


图 1g03864127
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。

表 2
"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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