U18E281 - TroubleshootingU18E281-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
U18E281	CCU_BCS_2 invalid data received接收到CCU_BCS_2无效数据	1. CAN line signal interference1.CAN线信号干扰
		2. ESP failure requires sending invalid values2.ESP故障需要发送无效值
		3.DCU CAN communication abnormality3.DCU CAN通讯异常

Troubleshooting steps故障诊断步骤

①General inspection一般检查

1. Check whether the CAN communication harness is damaged or broken.检查CAN通讯线束是否存在损坏、断裂等现象。 2. Check the CAN communication harness connector for loose connections or damage.检查CAN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 2.去步骤2。 No否 Repair or replace the faulty CAN communication harness or connector.维修或更换故障CAN通讯线束或接插件。

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 brake control system fault codes检查制动控制系统故障码

1. Use a diagnostic tool to read the brake control system fault code and check whether there is a fault in the brake control system.使用诊断仪读取制动控制系统故障码，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。

⑤Check the gateway controller fault code检查网关控制器故障码

1. Use a diagnostic tool to read the fault code of the gateway controller and check whether there is a fault in the gateway controller.使用诊断仪读取网关控制器故障码，检查网关控制器是否存在故障。 Are the test results normal?检查结果是否正常？ Yes是 Go to step 6.去步骤6。 No否 Troubleshoot the gateway controller based on the fault code.根据故障码排除网关控制器故障。

⑥Replacing the integrated electric drive assembly更换集成电力驱动总成

1. Replace the integrated electric drive assembly with a new one and check whether the fault code and symptoms are eliminated.更换新的集成电力驱动总成，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 integrated electric drive assembly, you need to use a diagnostic tool to recalibrate the integrated electric drive assembly.更换集成电力驱动总成后，需用诊断仪对集成电力驱动总成重新标定。