P20074B - TroubleshootingP20074B-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
P20074B	Electronic fan overtemperature failure电子风扇过温故障	1. The fan controller is overheated1.风扇控制器过温

Troubleshooting steps故障诊断步骤

①Check electronic fan controller检查电子风扇控制器

1. Check whether the electronic fan controller temperature is too high.检查电子风扇控制器温度是否过高。 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 Dissipate heat to the electronic fan controller; if the fault persists, go to step 2.对电子风扇控制器进行散热；若故障依旧，去步骤2。

②Replace electronic fan更换电子风扇

1. Replace the electronic fan with a new one and check whether the fault code and symptoms are eliminated.更换新的电子风扇，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。