P166B09 - TroubleshootingP166B09-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
P166B09	Extreme overcurrent fault极限过流故障	1. There is a short circuit or abuse on or outside the battery pack.1.电池包外部或者外部存在短路或者滥用情况

Troubleshooting steps故障诊断步骤

①Power on check上电检查

1. Power on the vehicle again and check whether the fault code and symptoms are eliminated.车辆重新上电，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 external high-voltage electrical appliances检查外部高压电器

1. Check whether the external high-voltage electrical appliance is faulty.检查外部高压电器是否存在故障。 2. Check whether there is a fault in the high-voltage wiring harness of external high-voltage electrical appliances.检查外部高压电器高压线束是否存在故障。 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 Replace faulty high-voltage components.更换故障高压部件。

③Turn off external high-voltage electrical appliances关闭外部高压电器

1. Turn off or stop some external high-voltage electrical appliances and check whether the fault is eliminated.关闭或停止部分外部高压电器工作，检查故障是否排除。 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 4.去步骤4。

④Replace the battery pack assembly更换电池组箱总成

1. Replace the battery pack assembly with a new one and check whether the fault code and symptoms are eliminated.更换新的电池组箱总成，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 battery pack assembly, you need to use a diagnostic tool to recalibrate the battery pack assembly.更换电池组箱总成后，需用诊断仪对电池组箱总成重新标定。