MID 027 - CID 2990 - FMI 12
产生此代码的情况:
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图 1 | g01941579 |
主换档杆的连接 |
此诊断代码与主换档杆有关。 当 ECU 读取到换档杆内部故障时,记录此诊断代码。
Cat 数据链路是所有电子控制模块的输入和输出。 数据链路的设计用于承载所有电子控制模块之间的通信传输。 数据链路是不可见的部件。 数据链路由内部控制电路和连接导线束组成。
该诊断代码可能的原因如下:
- ECU 无法识别换档杆。
- 换档杆有故障。
- ECU 软件的零件号不正确。
- ECU 有故障。
注: 以下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 2990 FMI 12 处于激活状态。
测试步骤 1. 确认软件版本。
注: 从 SIS 检查并记录机器电子模块的最新软件版本。
- 确认已将最新版本软件载入到 ECU 中。
预期结果:
所有软件为最新版本。
结果:
- 正常 - 所有软件为最新版本。 转至测试步骤 2。
- 异常 - 有可用的较新软件版本。
修复: 用最新的软件版本闪存所有控制装置。 请参阅测试和调整, KENR8291, "电子控制单元 - 闪存编程"。
停止
测试步骤 2. 确认换档杆是否存在。
- 确认 ECU 是否识别出换档杆。
预期结果:
ECU 识别换档杆的安装状态。
结果:
- 正常 - ECU 识别换档杆的安装状态。
修复: 换档杆可能有故障。 更换换档杆。
转至测试步骤 3。
- 异常 - ECU 无法识别换档杆的安装状态。 拆下换档杆,然后重新安装换档杆。 转至测试步骤 3。
测试步骤 3. 确认诊断代码是否存在。
- 检查线束接头。 清理线束接头的触点,并检查导线绝缘层是否由于过热、蓄电池酸液或擦伤而损坏。
- 对与电路有关的每一根导线进行拉力为
45 N (10 lb) 的拉拔测试。 - 重新连接所有线束接头。 确保接头完全座入且每个接头的夹子完全紧固。
- 将断路开关和钥匙起动开关转到接通位置。
- 操作机器。
- 确定 CID 2990 FMI 12 是否为激活状态。
预期结果:
CID 2990 FMI 12 为激活状态。
结果:
- 是 - CID 2990 FMI 12 为激活状态。 此故障没有得到排除。
修复: 再次检查电路。 ECU 不太可能会出现故障。 先退出此步骤,然后重新执行此步骤。 如果没有找到该诊断代码的原因,则应更换 ECU。 更换 ECU 之前,务必先咨询当地代理商的技术通信员征求 Caterpillar 可能的意见。 此咨询可以大大降低维修时间。 请参阅测试和调整, KENR8291, "电子控制单元 - 更换"。
停止
- 否 - CID 2990 FMI 12 为未激活状态。 此时不存在该故障。
修复: 原有诊断代码可能是由于某个断开后又重新连接的线束接头存在电气连接不良而引起的。 使机器恢复正常运转。
停止
Caterpillar Information System:
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