Troubleshooting › Body control system › Diagnosis
U041881-故障诊断 · T00607485

 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
Abnormal vehicle speed input signal data车速输入信号数据异常
1.GW gateway forwarding error1.GW网关转发错误
Troubleshooting steps故障诊断步骤
①Power-on inspection (taking the left front door control module fault report as an example)上电检查(以报左前门控制模块故障为例)
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 2.去步骤2。
②General inspection一般检查
1. Power state is "OFF", disconnect the negative terminal of the 12V battery.电源状态“OFF”，断开蓄电池负极。
2. Check whether the BCAN communication harness is damaged or broken.检查BCAN通讯线束是否存在损坏、断裂等现象。
3. Check the BCAN communication harness connector for loose connections or damage.检查BCAN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 Go to step 3.去步骤3。
No否 Repair or replace the BCAN communication harness or connector.维修或更换BCAN通讯线束或接插件。
③Check the gateway controller检查网关控制器
1. Power status "OFF".电源状态“OFF”。
2. Connect the diagnostic tool.连接诊断仪。
3. Power status "ON".电源状态“ON”。
4. Use a diagnostic tool to check the gateway controller.使用诊断仪检查网关控制器。
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 Repair the gateway controller.检修网关控制器。
④Check the integrated brake control system检查集成式制动控制系统
1. Power status "OFF".电源状态“OFF”。
2. Connect the diagnostic tool.连接诊断仪。
3. Power status "ON".电源状态“ON”。
4. Use a diagnostic tool to check the integrated brake control system.使用诊断仪检查集成式制动控制系统。
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 Overhaul the integrated brake control system.检修集成式制动控制系统。
⑤Replace left front door control module更换左前门控制模块
1. Replace the left front door control module with a new one and check whether the fault code and symptoms are eliminated.更换新的左前门控制模块，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 left front door control module, you need to use a diagnostic tool to recalibrate the left front door control module.更换左前门控制模块后，需用诊断仪对左前门控制模块重新标定。