DEF Tank Temperature Is Low
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| DEF 罐温度低故障诊断代码 | ||
|---|---|---|
| J1939 代码和描述 | 代码的前提条件 | 意见 |
| 3031-2
后处理 #1 DEF 罐温度：不稳定、间歇或不正确 |
- 蓄电池电压正常
- 钥匙开关信号（ECM：V13 和 V33，DCU：18 端子）持续激活超过 2 秒 - 除起动马达停止后 2 秒外，起动马达开关信号（ECM：V12 端子）未处于激活状态 - DCU 和发动机 ECM 之间的 CAN 通信正常 - DCU 和罐传感器之间的 CAN 通信正常 - DTC：DEF 罐温度传感器错误：未检测到超出范围低 (SPN 3031, FMI 4) - DTC：DEF 罐温度传感器错误：未检测到超出范围高 (SPN 3031, FMI 3) |
DEF 罐温度传感器数据超出范围，或者数据消息超时持续 12 秒或更长时间 |
| 3031-3
后处理 #1 DEF 罐温度：电压高于正常值 |
- 蓄电池电压正常
- 钥匙开关信号（ECM：V13 和 V33，DCU：18 端子）持续激活超过 2 秒 - 除起动马达停止后 2 秒外，起动马达开关信号（ECM：V12 端子）未处于激活状态 - DCU 和发动机 ECM 之间的 CAN 通信正常 - DCU 和罐传感器之间的 CAN 通信正常 |
通过 CAN 接收自 DEF 罐的温度传感器 FMI 指示 FMI 4（传感器元件开路）持续 2 秒或更长时间 |
| 3031-4
后处理 #1 DEF 罐温度：电压低于正常值 |
通过 CAN 接收自 DEF 罐的温度传感器 FMI 指示 FMI 4（传感器元件短路）持续 2 秒或更长时间 | |
| 遵循故障诊断与排除步骤来确定故障根源。 | ||
DEF 罐传感器组件在组件内具有温度传感器。 DEF 温度通过 CAN 通信传送到 DCU。
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| 故障诊断与排除测试步骤 | 数值 | 结果 |
|---|---|---|
1. 检查代码 A. 连接 Caterpillar 电子技师 (ET) 和 DCU。 如有必要，请参阅故障诊断与排除, "电子维修工具"。 B. 523616-2 与罐传感器无 CAN 通信是否处于激活或记录状态。 |
523616-2 |
结果：如果 523616-2 代码为激活或记录状态，首先对该代码进行故障诊断与排除。 结果：如果 523616-2 代码不是激活或记录状态。 转至测试步骤 2。 |
2. 检查 DEF 质量 A. 检查 DEF 质量。 请参阅测试和调整, "柴油机排气处理液质量 – 测试"。 |
DEF 质量符合标准 |
结果：如果 DEF 受到污染。 修理：更换 DEF 罐传感器组件，并冲洗 DEF 罐。 请参阅测试和调整, "柴油机排气处理液罐 – 冲洗"。 结果：DEF 符合技术规格 转至测试步骤 3。 |
3. 检查代码 A. 将钥匙开关转到断开位置，然后再转到接通位置。 B. 等待至少 47 秒，以确认代码是否重现。 |
代码激活 |
结果：代码仍处于激活状态。 修理：然后更换 DEF 罐传感器组件 结果：代码没有重现。 返回工作。 |
Caterpillar Information System:
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