U1340F3 - TroubleshootingU1340F3-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
U1340F3	There is a fault in the Ethernet communication of the IFC node and the Ethernet link is disconnected.IFC节点以太网通讯存在故障，以太网链路断开	1. Ethernet communication failure1.以太网通信故障

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 the lane departure warning ECU Ethernet communication hard wire harness for damage, breakage, etc.检查车道偏离预警ECU以太网通讯硬线线束是否存在损坏、断裂等现象。 3. Check the lane departure warning ECU Ethernet communication hard-wire harness connector for loose connections or damage.检查车道偏离预警ECU以太网通讯硬线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 the Ethernet communication hardwire检查以太网通讯硬线
	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 gateway controller (Ethernet) 2 harness connector IP61 and the lane departure warning ECU harness connector BD36.断开网关控制器(以太网)2线束接插件IP61和车道偏离预警ECU线束接插件BD36。 3. Use a multimeter to measure the resistance between pins 11/12 of the gateway controller (Ethernet) 2 harness connector IP61 and pins 8/7 of the lane departure warning ECU harness connector BD36.使用万用表测量网关控制器(以太网)2线束接插件IP61的11/12号针脚与车道偏离预警ECU线束接插件BD36的8/7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 4.去步骤4。 No否 Repair or replace the faulty wiring harness.维修或更换故障线束。
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。