B320E91 - TroubleshootingB320E91-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
B320E91	Backup battery life alarm后备电池寿命告警	1.The battery is not inserted1.电池未插
		2.Battery damage2.电池损坏

Troubleshooting steps故障诊断步骤

①General inspection一般检查

1. Check whether the backup battery is securely installed.检查后备电池安装是否牢固。 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 Reinstall the backup battery.重新安装后备电池。

②Replace the backup battery更换后备电池

1. Replace the backup battery with a new one and check whether the fault code and symptoms are eliminated.更换新的后备电池，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。

③Replace 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。