MID 027 - CID 1292 - FMI 04
产生此代码的情况:
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图 1 | g01944263 |
档位保持开关的连接 |
此诊断代码与档位保持开关有关。 当 ECU 确定电路的电压低于正常值时,记录 FMI 04。 该开关为瞬时开关。
产生此诊断代码的可能原因如下:
- 信号电路(导线 T921-PK(粉))始终对接地短路。
- 开关出现故障。
- ECU 有故障。 这不太可能。
执行该步骤前,检查电路中的线束接头。 不良连接经常是引起电路故障的原因。 确认电路中的所有连接都清洁紧固。 如果发现连接存在故障,则修复故障并在执行此步骤前核实该诊断代码为激活状态。下面的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 1292 FMI 04 处于激活状态。
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开关的状态 | ||
---|---|---|
模式 | 开关位置 | J1-35
T921-PK(粉) 电路 |
松开 | 向上 | 开路 |
按下 | 向下 | 闭合 |
测试步骤 1. 检查开关。
- 从机器线束上断开开关。
- 检查开关的触点 1 和触点 2 之间的导通性。
- 按下开关。 释放开关并检查是否导通。
预期结果:
导通性检查的结果与表 1 中的规定一致。
结果:
- 正常 - 导通性检查的结果一致。 转至测试步骤 2。
- 异常 - 导通性检查的结果不一致。 开关出现故障。
修复: 更换开关。 确认使用新开关后诊断代码得到排除。
停止
测试步骤 2. 检查线束中的信号电路有无短路。
- 将开关重新连接到机器线束上。
- 从 ECU 上断开机器线束接头 J1 和 J2。
- 在 ECU 的机器线束接头上,检查触点 J1-35(导线 T921-PK(粉))和触点 J2-22(导线 993-BR(褐))之间的导通性。
- 按下开关。 释放开关并检查是否导通。
预期结果:
导通性检查的结果与表 1 中的规定一致。
结果:
- 正常 - 导通性检查的结果一致。
修复: 重新连接机器线束接头。 确认已排除诊断代码。 如果没有找到故障的起因,请咨询当地代理商征求 Caterpillar 可能的意见。 此咨询可以大大降低维修时间。 如果需要更换 ECU,请参阅测试和调整, KENR8291, "电子控制单元 - 更换"。
停止
- 异常 - 导通性检查的结果不一致。
修复: 机器线束中存在短路。 修理或更换机器线束。
停止
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