U045281 - TroubleshootingU045281-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
U045281	The EPS communication module is faulty and the SRS_3 node signal is invalid.EPS通讯模块存在故障，SRS_3节点信号无效	1. Transmitter ECU failure1.发送器ECU故障
		2.CAN bus failure2.CAN总线故障
		3.EPS CAN module failure3.EPS CAN模块故障

Troubleshooting steps故障诊断步骤

①General inspection一般检查

Power state is "OFF", disconnect the negative terminal of the 12V battery.电源状态“OFF”，断开蓄电池负极。

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

Check the ACANFD communication harness connector for loose connections or damage.检查ACANFD通讯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

Fault resolved.故障排除。

No否

Repair or replace faulty communication harness or connector.维修或更换故障通讯线束或接插件。

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 airbag fault codes检查安全气囊故障码

Use a diagnostic tool to read the airbag fault code and check whether the airbag is faulty.使用诊断仪读取安全气囊故障码，检查安全气囊是否存在故障。

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 airbag fault code according to the fault code.根据故障码排除安全气囊故障码。

⑤Replace the electric power steering column更换电动助力转向管柱

Replace the electric power steering column with a new one and check whether the fault code and symptoms are eliminated.更换新的电动助力转向管柱，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 electric power steering column, you need to use a diagnostic instrument to recalibrate the electric power steering column.更换电动助力转向管柱后，需用诊断仪对电动助力转向管柱重新标定。