B1C9921 - TroubleshootingB1C9921-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
B1C9921	Serious refrigerant leakage冷媒严重泄漏	1. Refrigerant leaks or no refrigerant is added1.冷媒泄露或者未加冷媒

Troubleshooting steps故障诊断步骤

①General inspection一般检查

1. Check whether the refrigerant pressure in the air conditioning pipeline is normal.检查空调管路中冷媒压力是否正常。 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 faulty parts and refill the refrigerant.更换故障部件，重新加注冷媒。

②Power 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 3.去步骤3。

③Replacing the thermal management integrated module更换热管理集成模块

1. Replace the thermal management integrated module with a new one and check whether the fault code and symptoms are eliminated.更换新的热管理集成模块，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 thermal management integrated module, you need to use a diagnostic instrument to recalibrate the thermal management integrated module.更换热管理集成模块后，需用诊断仪对热管理集成模块重新标定。