Troubleshooting › Driving and parking assistance systems › Diagnosis
U041881-故障诊断 · T00611771

 U041881 - TroubleshootingU041881-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
U041881
There is a fault in communication with IBCS and invalid serial port data is received.与IBCS通信存在故障，接收到无效串口数据
1. The node data of the brake control system is invalid1.制动控制系统节点数据无效
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 IBCS fault code检查IBCS故障码
1. Use a diagnostic tool to read the IBCS fault code and check whether there is a fault in the brake control system.使用诊断仪读取IBCS故障码，检查制动控制系统是否存在故障。
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 brake control system according to the fault code.根据故障码排除制动控制系统故障。
⑤Replace the parking sensor controller更换倒车雷达控制器
1. Replace the parking sensor controller with a new one and check whether the fault code and symptoms are eliminated.更换新的倒车雷达控制器，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 parking sensor controller, you need to use a diagnostic tool to recalibrate the parking sensor controller.更换倒车雷达控制器后，需用诊断仪对倒车雷达控制器重新标定。