U1A0F88 - TroubleshootingU1A0F88-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
U1A0F88	IFC_CANFD1 is faulty and offlineIFC_CANFD1存在故障，离线	1.CAN Bus off

Troubleshooting steps故障诊断步骤

①General 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 private CAN communication harness is damaged or broken.检查私有CAN通讯线束是否存在损坏、断裂等现象。 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 the private CAN communication harness or connector.维修或更换私有CAN通讯线束或接插件。

②Check private CAN communication waveform检查私有CAN通讯波形

1. Power status "OFF".电源状态“OFF”。 2. Connect the oscilloscope.连接示波器。 3. Power status "ON".电源状态“ON”。 4. Use an oscilloscope to measure the waveforms of Private CAN-H and Private CAN-L.用示波器测量私有CAN-H和私有CAN-L的波形。 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 Check the private CAN communication harness; if normal, go to step 3.检查私有CAN通讯线束；若正常，去步骤3。

③Check the lane departure warning ECU system检查车道偏离预警ECU系统

1. Check whether the lane departure warning ECU system is normal.检查车道偏离预警ECU系统是否正常。 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 lane departure warning ECU system.维修车道偏离预警ECU系统。

④Replace 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。