P18904B - TroubleshootingP18904B-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
P18904B	Control board overtemperature Level1控制板过温 Level1	1. Abnormal traffic1.流量异常
		2. The radiator works abnormally2.散热器工作异常

Troubleshooting steps故障诊断步骤

①General inspection一般检查

1. Turn off the power to the entire vehicle.关闭整车电源。 2. Let the vehicle cool down and then power it on again to check whether the fault code and symptoms are eliminated.车辆静置冷却后重新上电，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 cooling system检查冷却系统

1. Check whether the cooling system is normal.检查冷却系统是否正常。 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 Check the cooling system.检修冷却系统。

③Replacing 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。