P189A16 - TroubleshootingP189A16-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
P189A16	HVDC undervoltage faultHVDC欠压故障	1. Low voltage of high-voltage battery pack1.高压电池组电压低
		2. Hardware sampling circuit failure2.硬件采样电路故障

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 the DC bus voltage value检查直流母线电压数值

1. Read the DID DC bus voltage value and check whether the DC bus voltage is normal.读取DID直流母线电压数值，检查直流母线电压是否正常。 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 Go to step 3.去步骤3。

③Check battery pack voltage检查电池组箱电压

1. Check whether the battery pack voltage is within the normal range.检查电池组箱电压是否在正常范围内。 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 Go to step 4.去步骤4。

④Check BMS fault code检查BMS故障码

1. Use a diagnostic tool to read the BMS fault code and check whether there is a fault in the battery pack.使用诊断仪读取BMS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 5.去步骤5。 No否 Troubleshoot the battery pack according to the fault code.根据故障码排除电池组箱故障。

⑤Replacing the integrated electric drive assembly更换集成电力驱动总成

1. Replace the integrated electric drive assembly with a new one and check whether the fault code and symptoms are eliminated.更换新的集成电力驱动总成，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 integrated electric drive assembly, you need to use a diagnostic tool to recalibrate the integrated electric drive assembly.更换集成电力驱动总成后，需用诊断仪对集成电力驱动总成重新标定。