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


MID 079 - CID 0346 - 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 ECM 到继电器线圈的通路不完整。 如果存在该故障,行驶控制装置停用。

系统响应:

在出现该诊断代码时,监视器上显示警告。

测试步骤 1. 检查继电器。

  1. 把钥匙开关转到断开位置。

  1. 将行驶控制装置继电器从插座上拆下。

  1. 测量端子 85 与端子 86 之间的电阻。

  1. 电阻应约为 480 欧姆。

预期结果:

电阻约为 480 欧姆。

结果:

  • 是 - 继电器没有故障。 开始测试步骤2。

  • 否 - 继电器有故障。

    修复: 更换继电器。

    停止

测试步骤 2. 检查线束电路

  1. 清洁继电器端子和插座。

  1. 安装继电器。

  1. 从 ECM 上断开线束接头。

  1. 检查线束接头上触点 37 与触点 39 之间的电阻。

预期结果:

电阻应约为 480 欧姆。

结果:

  • 否 - 电阻大于 5000 欧姆。 机器线束在信号线中开路。

    修复: 修理或更换线束。

    停止

  • 是 - 电阻约为 480 欧姆。 转至测试步骤 3。

测试步骤 3. 检查是否仍存在故障

  1. 检查并重新连接接头。

  1. 将起动开关转到接通位置。

  1. 进入维修模式。

  1. 操作机器。

  1. 检查之前的故障是否激活。

结果:

  • 是 - 该故障仍然激活。 该故障没有排除。

    修复: 再次执行以上步骤。 如果没有找到故障原因,则更换控制装置。

    停止

  • 否 - 该故障未激活。

    修复: 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

Caterpillar Information System:

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