U025887 - TroubleshootingU025887-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
U025887	There is a fault in communication with IFC and the message is lost.与IFC通信存在故障，报文丢失	1. Camera node communication is lost1.摄像头节点通讯丢失

Troubleshooting steps故障诊断步骤

①General inspection一般检查
1. Power status 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 private CAN communication harness is damaged or broken.检查私有CAN通讯线束是否存在损坏、破裂等现象。 3. Check the private CAN communication harness connector for loose connections or damage.检查私有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 faulty wiring harness or connector.维修或更换故障线束或接插件。
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 the current environment.将车辆驶离当前环境。
④Check the private CAN communication harness检查私有CAN通讯线束
	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. Disconnect the forward radar harness connector FP12 and the lane departure warning ECU harness connector BD36.断开前向雷达线束接插件FP12和车道偏离预警ECU线束接插件BD36。 3. Use a multimeter to measure the resistance between pins 2/3 of FP12 and pins 10/11 of BD36.使用万用表测量FP12的2/3号针脚与BD36的10/11号针脚之间的电阻。 Standard resistance value: <1标准电阻值：＜1 Ω 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 Repair or replace the faulty wiring harness.维修或更换故障线束。
⑤Check lane departure warning ECU fault code检查车道偏离预警ECU故障码
1. Use a diagnostic tool to read the lane departure warning ECU fault code and check whether there is a fault in the lane departure warning ECU.使用诊断仪读取车道偏离预警ECU故障码，检查车道偏离预警ECU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 lane departure warning ECU fault according to the fault code.根据故障码排除车道偏离预警ECU故障。
⑥Replace forward radar更换前向雷达
1. Replace with a new forward radar and check whether the fault code and symptoms are eliminated.更换新的前向雷达，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 forward radar, you need to use a diagnostic tool to recalibrate the forward radar.更换前向雷达后，需用诊断仪对前向雷达重新标定。