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


MID 079 - CID 0422 - FMI 02

Usage:

IT14G 1WN
产生此代码的情况:

传动轴转速由频率传感器检测。 转速信号位于控制装置接头触点 5 处。 没有信号输入到控制装置产生故障指示。

测试步骤 1. 检查传感器

  1. 将钥匙起动开关转到断开位置。

  1. 拆下传感器,并检查传感器端部有无异物。

  1. 安装并调整转速传感器。

  1. 运转发动机。

  1. 检查控制装置有无激活的故障。

结果:

  • 否 - 调整或清洁转速传感器后排除该故障。

    修复: 清除故障。

    停止

  • 是 - 转至测试步骤 2。

测试步骤 2. 检查传感器电阻

  1. 将钥匙起动开关转到断开位置。

  1. 从传感器上断开机器线束。

  1. 在传感器接头处,测量两个触点之间的电阻。

结果:

  • 否 - 该电阻不在 600 至 1600 欧姆之间。 传感器有故障。

    修复: 更换传感器。 安装后适当调整传感器。 清除故障。

    停止

  • 是 - 该电阻在 600 至 1600 欧姆之间。 转速传感器电阻正确。 转至步骤 3。

测试步骤 3. 检查线束

  1. 连接传感器和机器线束。

  1. 从机器线束上断开控制装置。

  1. 在机器线束上,测量触点 2(地面)与触点 5 之间的电阻。

预期结果:

电阻应在 600 至 1600 欧姆之间。

结果:

  • 是 - 线束电阻正常。

    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

  • 否 - 机器线束短路或开路。

    修复: 修理或更换线束。 清除故障。

    停止

Caterpillar Information System:

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