U007488 - TroubleshootingU007488-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
U007488	ACAN has a fault and the node is offlineACAN存在故障，节点离线	1.ACAN Busoff

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 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。 3. Check the ACANFD communication harness connector for loose connections or damage.检查ACANFD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 ACANFD communication harness or connector.维修或更换ACANFD通讯线束或接插件。

②Check ACANFD communication waveform检查ACANFD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 ACANFD-H and ACANFD-L.用示波器测量ACANFD-H和ACANFD-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 ACANFD communication harness; if normal, go to step 3.检查ACANFD通讯线束；若正常，去步骤3。

③Check other related systems on the ACANFD communication bus检查ACANFD通讯总线上其他相关系统

1. Check whether other related systems on the ACANFD bus are normal.检查ACANFD总线上其他相关系统是否正常。 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 related faulty systems.维修相关故障系统。

④Replace lane departure warning ECU更换车道偏离预警ECU

1. Replace with a new lane departure warning ECU and check whether the fault code and symptoms are eliminated.更换新的车道偏离预警ECU，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 lane departure warning ECU, you need to use a diagnostic tool to recalibrate the lane departure warning ECU.更换车道偏离预警ECU后，需用诊断仪对车道偏离预警ECU重新标定。