CX31-P600-C11I, CX31-P600-C13I, CX31-P600-C15I, CX31-P600-C18I and CX31-P600-C9I Petroleum Power Train Packages and CX31-P600 Petroleum Transmission Power Train Electronic Control System Caterpillar


MID 027 - CID 1292 - FMI 04

Usage:

CX31-P600 GFY
产生此代码的情况:


图 1g01944263
档位保持开关的连接

此诊断代码与档位保持开关有关。 当 ECU 确定电路的电压低于正常值时,记录 FMI 04。 该开关为瞬时开关。

产生此诊断代码的可能原因如下:

  • 信号电路(导线 T921-PK(粉))始终对接地短路。

  • 开关出现故障。

  • ECU 有故障。 这不太可能。

执行该步骤前,检查电路中的线束接头。 不良连接经常是引起电路故障的原因。 确认电路中的所有连接都清洁紧固。 如果发现连接存在故障,则修复故障并在执行此步骤前核实该诊断代码为激活状态。下面的测试步骤可能会生成其他诊断代码。 忽略生成的这些诊断代码,并在修复原有诊断代码后清除这些忽略的诊断代码。 执行本步骤之前,请确保诊断代码 CID 1292 FMI 04 处于激活状态。

表 1
开关的状态 
模式  开关位置  J1-35
T921-PK(粉) 电路 
松开  向上  开路 
按下  向下  闭合 

测试步骤 1. 检查开关。

  1. 从机器线束上断开开关。

  2. 检查开关的触点 1 和触点 2 之间的导通性。

  3. 按下开关。 释放开关并检查是否导通。

预期结果:

导通性检查的结果与表 1 中的规定一致。

结果:

  • 正常 - 导通性检查的结果一致。 转至测试步骤 2。

  • 异常 - 导通性检查的结果不一致。 开关出现故障。

    修复: 更换开关。 确认使用新开关后诊断代码得到排除。

    停止

测试步骤 2. 检查线束中的信号电路有无短路。

  1. 将开关重新连接到机器线束上。

  2. 从 ECU 上断开机器线束接头 J1 和 J2。

  3. 在 ECU 的机器线束接头上,检查触点 J1-35(导线 T921-PK(粉))和触点 J2-22(导线 993-BR(褐))之间的导通性。

  4. 按下开关。 释放开关并检查是否导通。

预期结果:

导通性检查的结果与表 1 中的规定一致。

结果:

  • 正常 - 导通性检查的结果一致。

    修复: 重新连接机器线束接头。 确认已排除诊断代码。 如果没有找到故障的起因,请咨询当地代理商征求 Caterpillar 可能的意见。 此咨询可以大大降低维修时间。 如果需要更换 ECU,请参阅测试和调整, KENR8291, "电子控制单元 - 更换"。

    停止

  • 异常 - 导通性检查的结果不一致。

    修复: 机器线束中存在短路。 修理或更换机器线束。

    停止

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