U120487 - TroubleshootingU120487-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
U120487	BMS message lostBMS报文丢失	1.BMS node is offline1.BMS节点离线
		2.BMS node is damaged2.BMS节点损坏
		3. The BMS node does not send messages according to the scheduled period.3.BMS节点未按预定周期发出报文

Troubleshooting steps故障诊断步骤

①Power 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 2.去步骤2。

②Check your surroundings检查周围环境

1. Check the surrounding environment for the presence of magnetic fields.检查周围环境是否存在磁场。 Are the test results normal?检查结果是否正常？ Yes是 Go to step 3.去步骤3。 No否 Drive away from the current situation.驶离当前所处环境。

③General 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 ECAN communication harness is damaged or broken.检查ECAN通讯线束是否存在损坏、断裂等现象。 3. Check the ECAN communication harness connector for loose connections or damage.检查ECAN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 4.去步骤4。 No否 Repair or replace faulty wiring harness or connector.维修或更换故障线束或接插件。

④Check ECAN communication waveform检查ECAN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 ECAN-H and ECAN-L.用示波器测量ECAN-H和ECAN-L的波形。 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 Check the ECAN communication harness; if normal, go to step 5.检查ECAN通讯线束；若正常，去步骤5。

⑤Check the battery pack fault code检查电池组箱故障码

1. Use a diagnostic tool to read the battery pack fault code and check whether there is a fault in the battery pack.使用诊断仪读取电池组箱故障码，检查电池组箱是否存在故障。 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 according to the fault code.根据故障码排除故障。

⑥Replace gateway controller更换网关控制器

1. Replace with a new gateway controller and check whether the fault code and symptoms are eliminated.更换新的网关控制器，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 gateway controller, you need to use a diagnostic tool to recalibrate the gateway controller.更换网关控制器后，需用诊断仪对网关控制器重新标定。