MID 027 - CID 3525 - FMI 03
产生此代码的情况:
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图 1 | g02021034 |
PTO 2 接合电磁阀的连接 |
该诊断代码与 PTO 2 接合电磁阀有关。 FMI 03 表示 ECU 已确定电磁阀电路的电压高于正常值。
可能由于下列原因产生该诊断代码:
- 电磁阀出现故障。
- 电磁阀电源电路对蓄电池正极电路短路。
- 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。 忽略生成的这些诊断代码,并在修复原有诊断代码后清除这些忽略的诊断代码。 执行本步骤之前,请确保诊断代码 CID 3525 FMI 03 处于激活状态。
注: 使用数字万用表执行此步骤中的测量。
测试步骤 1. 检查电磁阀电源电路是否对蓄电池正极电路短路。
- 将钥匙起动开关和断路开关转到断开位置。
- 从电磁阀和 ECU 上断开机器线束接头。
- 在 ECU 机器线束接头上,测量触点 J2-6(导线 R955-GY(灰))与 ECU 机器线束接头中使用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 2。
- 异常 - 各电阻测量值都不大于 5000 欧姆。 机器线束中存在短路。 J2-6 (R955-GY(灰)) 与电阻测量值低的电路之间短路。
修复: 修理或更换机器线束。
停止
测试步骤 2. 检查该诊断代码是否仍处于现行状态。
- 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。
- 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。 - 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。
- 将断路开关和钥匙起动开关转到接通位置。
- 操作机器。
- 确定 CID 3525 FMI 03 是否为激活状态。
预期结果:
CID 3525 FMI 03 为激活状态。
结果:
- 是 - CID 3525 FMI 03 为激活状态。 此故障没有得到排除。
修复: 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 3525 FMI 03 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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