U041281 - TroubleshootingU041281-故障诊断

Fault code description故障码说明

DTC故障码(DTC)	Fault code description故障码描述	Possible cause of failure可能故障原因
U041281	Received BMS invalid data收到BMS无效数据	1.BMS node is offline1.BMS节点离线
		2.BMS node is damaged2.BMS节点损坏
		3. The BMS node does not send messages according to the scheduled period.3.BMS节点未按预定的周期发出报文

Troubleshooting steps故障诊断步骤

①General inspection一般检查

Check whether the ECAN communication harness is damaged or broken.检查ECAN通讯线束是否存在损坏、断裂等现象。

Check whether there is any loose connection or damage to the wiring harness connector.检查线束接插件是否存在虚接、损坏等现象。

Are the test results normal?检查结果是否正常？

Yes是

Go to step 2.去步骤2。

No否

Repair or replace the faulty communication harness.维修或更换故障通讯线束。

②Power on check上电检查

Repower the vehicle, use the diagnostic tool to read and clear the fault codes, and check whether the fault codes and symptoms are eliminated.车辆重新上电，使用诊断仪读取并清除故障码，检查故障码及症状是否排除。

Are the test results normal?检查结果是否正常？

Yes是

Fault resolved.故障排除。

No否

Go to step 3.去步骤3。

③Check for electromagnetic interference检查电磁干扰

Check for sources of magnetic fields around the vehicle.检查车辆周围是否存在磁场源。

Are the test results normal?检查结果是否正常？

Yes是

Go to step 4.去步骤4。

No否

Move the vehicle away from its current environment.使车辆驶离当前环境。

④Check BMS fault code检查BMS故障码

Use a diagnostic tool to read the BMS fault code and check whether there is a fault in the battery pack.使用诊断仪读取BMS故障码，检查电池组箱是否存在故障。

Are the test results normal?检查结果是否正常？

Yes是

Go to step 5.去步骤5。

No否

Troubleshoot the battery pack according to the fault code.根据故障码排除电池组箱故障。

⑤Replacing the thermal management integrated module更换热管理集成模块

Replace the thermal management integrated module with a new one and check whether the fault code and symptoms are eliminated.更换新的热管理集成模块，检查故障码及症状是否排除。

Are the test results normal?检查结果是否正常？

Yes是

Fault resolved.故障排除。

No否

Look for causes from other symptoms.从其他症状查找原因。

Caution:注意：

♦

After replacing the thermal management integrated module, you need to use a diagnostic instrument to recalibrate the thermal management integrated module.更换热管理集成模块后，需用诊断仪对热管理集成模块重新标定。