914G Compact Wheel Loader and IT14G Integrated Toolcarrier Transmission Electronic Control System Caterpillar


MID 079 - CID 0347 - FMI 03

Usage:

IT14G 1WN
产生此代码的情况:

当 ECM 检测到对蓄电池正极端子短路时,指示该故障。 短路发生在 ECM 到螺旋管的通路中。 存在该故障时,机器处于低速范围。 速度开关的位置无关紧要。 接头触点 38 与该故障相关。

注: 以下步骤可能会产生其他指示故障。 排除原始故障后,清除这些故障。

测试步骤 1. 检查电磁阀

  1. 将起动开关转到断开位置。

  1. 断开排量电磁阀。

  1. 将起动开关转到接通位置。

  1. 测量线束接头处的电压。 测量触点 1 与触点 2 间的电压。

注: 该步骤导致控制装置记录开路。 完成故障排除后清除该代码。

预期结果:

电压等于蓄电池电压。

结果:

  • 否 -

    修复: 更换电磁阀。

    停止

  • 是 - 电压等于蓄电池电压。 转至测试步骤 2。

测试步骤 2. 检查线束

  1. 将起动开关转到断开位置。

  1. 从控制装置上断开线束。

  1. 把钥匙开关转到接通位置。

  1. 测量触点 2 与触点 38 间的电压。

预期结果:

电压等于蓄电池电压。

结果:

  • 是 - 电压约为蓄电池电压。 线束中存在对蓄电池正极导线短路。

    修复: 修理或更换线束。

    停止

  • 否 - 电压为 0 DCV。 未找到故障原因。 转至步骤 3。

测试步骤 3. 检查是否仍存在故障

  1. 将起动开关转到断开位置。

  1. 检查接头。 重新连接接头。

  1. 将起动开关转到接通位置。

  1. 进入维修模式。 操作机器。

  1. 检查原始故障是否为激活状态。

预期结果:

该故障未激活。

结果:

  • 否 - 该故障没有排除。

    修复: 执行之前的步骤。 如果没有找到故障原因,则更换控制装置。

    停止

  • 是 - 该故障已排除。 故障可能是电气连接不良的结果。 使机器恢复正常运转。停止

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