CX31-P600-C11I, CX31-P600-C13I, CX31-P600-C15I, CX31-P600-C18I and CX31-P600-C9I Petroleum Power Train Packages and CX31-P600 Petroleum Transmission Power Train Electronic Control System Caterpillar


MID 027 - CID 0826 - FMI 04

Usage:

CX31-P600 GFY
产生此代码的情况:


图 1g01991656
变矩器油温传感器的连接

该诊断代码与变矩器油温传感器有关。 FMI 04 表示 ECU 已确定传感器电路的电压低于正常值。

可能产生此诊断代码的原因如下:

  • 变矩器油温传感器的电源电路与接地间短路。

  • 传感器出故障。

  • ECU 有故障。 这不太可能。

注: 以下测试步骤可能会生成其他诊断代码。 请忽略所产生的诊断代码,在排除原有诊断代码后清除即可。 执行本步骤之前,请确保诊断代码 CID 0826 FMI 04 处于激活状态。

注: 使用数字式万用表进行本步骤中的测量。

测试步骤 1. 检查传感器

  1. 将断路开关和钥匙起动开关转到接通位置。

  2. 确保该诊断代码处于激活状态。

  3. 观察诊断代码的状态。 从机器线束上断开传感器。

预期结果:

CID 0826 FMI 04 保持激活状态。

结果:

  • 正常 - 该诊断代码仍处于现行状态。 传感器正常。 转至测试步骤 2。

  • 异常 - 该诊断代码不再为激活状态。 传感器出故障。

    修复: 更换传感器。

    停止

测试步骤 2. 检查传感器导线线束是否对接地短路

  1. 将钥匙起动开关和断路开关转到断开位置。

  2. 从传感器上断开机器线束。

  3. 从 ECU 上断开机器线束接头 J1 和 J2。

  4. 在 ECU 的机器线束接头上,测量机器线束的信号触点 J1-29(导线 407-PK(粉))与所有可能的接地源之间的电阻。 测量与 ECU 机器线束接头的所有触点之间的电阻。

预期结果:

各电阻测量值都大于 5000 欧姆。

结果:

  • 正常 - 各电阻测量值都大于 5000 欧姆。 机器线束正常。 转至测试步骤 3。

  • 异常 - 一个或多个电阻测量值不正确。 机器线束中存在短路。

    修复: 信号触点 J1-29(导线 407-PK(粉))与电阻测量值偏低的电路之间短路。 修理或更换机器线束。

    停止

测试步骤 3. 检查该诊断代码是否仍处于现行状态。

  1. 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。

  2. 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。

  3. 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。

  4. 将断路开关和钥匙起动开关转到接通位置。

  5. 操作机器。

  6. 确定 CID 0826 FMI 04 是否为激活状态。

预期结果:

CID 0826 FMI 04 为激活状态。

结果:

  • 是 - CID 0826 FMI 04 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 0826 FMI 04 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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