MID 027 - CID 0702 - FMI 08
产生此代码的情况:
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图 1 | g01941579 |
主换档杆和辅助换档杆的连接 |
此诊断代码与变速箱档位选择器的传感器有关。 FMI 08 表示 ECU 检测到传感器电路的信号无效。
产生此诊断代码的可能原因如下:
- 导线 K900-YL(黄) 与传感器回路 (J2-67) 之间短路。
- 传感器安装不正确。
- 传感器出故障。
- ECU 有故障。 这不太可能。
注: 如果机器关闭且该诊断代码为现行状态,机器将无法再次起动,直到该诊断代码清除。 为了使机器起动,传感器必须指示在空档位置。
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 0702 FMI 08 处于激活状态。
注: 使用数字万用表执行此步骤中的测量。
系统响应:
该诊断代码的结果如下:
- 机器将不会换档。
- 变速箱会保持在目前档位上。
- 锁止离合器电磁阀将分离。
测试步骤 1. 检查传感器。
- 将断路开关和钥匙起动开关转到接通位置。
- 确保该诊断代码处于激活状态。
- 观察诊断代码的状态。 从传感器上断开机器线束。
预期结果:
如果传感器不是引起该诊断代码的原因,该诊断代码将仍为现行状态。 如果该诊断代码不再处于现行状态,则传感器是引发该诊断代码的原因。
结果:
- 正常 - 该诊断代码仍处于现行状态。 传感器没有故障。 可能是机器线束出故障或 ECU 出故障。 转至测试步骤 2。
- 异常 - 该诊断代码应不再为激活状态。 机器线束和 ECU 工作正常。
修复: 传感器出故障。 更换传感器。
停止
测试步骤 2. 检查该诊断代码是否仍处于现行状态。
- 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以便确保接头完全座入。 此外,确保各个接头的夹子紧固。
- 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 0702 FMI 08 是否为激活状态。
预期结果:
CID 0702 FMI 08 为激活状态。
结果:
- 是 - CID 0702 FMI 08 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 0702 FMI 08 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某个断开以及重新连接的线束接头上存在接触不良或短路引起的。 使机器恢复正常运转。
停止
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