Troubleshooting › Driving and parking assistance systems › Diagnosis
U041781-故障诊断 · T00610858

 U041781 - TroubleshootingU041781-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
U041781
There is a fault in communication with EPB and invalid serial port data is received.与EPB通信存在故障，接收到无效串口数据
1. Received EPB invalid data1.收到EPB无效数据
Troubleshooting steps故障诊断步骤
①General inspection一般检查
1. 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。
2. 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
1. 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
1. 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 EPB fault code检查EPB故障码
1. Use the diagnostic tool to read the EPB fault code and check whether there is a fault in the electronic parking control unit.使用诊断仪读取EPB故障码，检查电子驻车控制单元是否存在故障。
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 electronic parking control unit according to the fault code.根据故障码排除电子驻车控制单元故障。
⑤Replace lane departure warning ECU更换车道偏离预警ECU
1. Replace with a new lane departure warning ECU and check whether the fault code and symptoms are eliminated.更换新的车道偏离预警ECU，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 lane departure warning ECU, you need to use a diagnostic tool to recalibrate the lane departure warning ECU.更换车道偏离预警ECU后，需用诊断仪对车道偏离预警ECU重新标定。