B320B79 - TroubleshootingB320B79-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
B320B79	Ethernet line failure以太网线路故障	1. Internal circuit failure of T-BOX1.T-BOX的内部电路故障
		2. External Ethernet harness or connector failure2.外部以太网线束或接插件故障

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 whether the Ethernet cable is damaged or broken.检查以太网电缆是否存在损坏、断裂等现象。 3. Check whether the Ethernet cable connector is empty or damaged.检查以太网电缆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 Replace the cable.更换电缆。

②Replace T-BOX更换T-BOX

1. Replace with a new T-BOX and check whether the fault code and symptoms are eliminated.更换新的T-BOX，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 T-BOX, you need to use a diagnostic instrument to recalibrate the T-BOX.更换T-BOX后，需用诊断仪对T-BOX重新标定。