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


MID 079 - CID 0418 - FMI 05

Usage:

IT14G 1WN
产生此代码的情况:

当 ECM 检测到不完整的电路时,指示该故障。 从控制装置到继电器线圈的通路开路。 接头触点 34 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. 检查继电器。

  1. 将起动开关转到断开位置。

  1. 拆下继电器。

  1. 检查有无烧毁的继电器。

预期结果:

继电器正常。

结果:

  • 否 - 继电器烧毁。

    修复: 更换继电器。

    停止

  • 是 - 继电器正常。 测量继电器线圈的电阻。 转至测试步骤 2。

测试步骤 2. 检查线束电路

  1. 清理继电器端子。

  1. 清理插座。

  1. 更换继电器。

  1. 从 ECM 上断开线束接头。

  1. 测量触点 34 和触点 39 之间的电阻。

预期结果:

电阻应等于步骤 1 中的电阻。

结果:

  • 否 - 电阻大于 5000 欧姆。 线束中存在开路。

    修复: 修理或更换线束。

    停止

  • 是 - 电阻等于步骤 1 中的电阻。 转至步骤 3。

测试步骤 3. 检查是否仍存在故障

  1. 检查接头。 重新连接线束接头。

  1. 将起动开关转至接通。

  1. 进入维修模式。

  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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