P186B4B - TroubleshootingP186B4B-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
P186B4B	IGBT junction temperature overtemperatureIGBT结温过温	1.INV cooling system failure1.INV冷却系统故障
		2. Junction temperature estimation algorithm fails2.结温估算算法失效

Troubleshooting steps故障诊断步骤

①Check coolant检查冷却液

1. Check whether the coolant level is within the normal range.检查冷却液液位是否在正常刻度范围。 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 Go to step 2.去步骤2。

②Check cooling lines检查冷却管路

1. Check the cooling pipeline for cracks, disconnections, leaks, etc.检查冷却管路是否存在破裂、断开、漏液等情况。 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 faulty cooling pipe and add coolant that meets the specifications.检修故障冷却管路，并添加符合规格要求的冷却液。

③Cooling check冷却检查

1. Let the vehicle cool down for 30 minutes and check whether the fault code and symptoms are eliminated.车辆静置冷却30分钟，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 4.去步骤4。

④Check cooling system fault codes检查冷却系统故障码

1. Use a diagnostic tool to read the cooling system fault code and check whether there is a fault in the cooling system.使用诊断仪读取冷却系统故障码，检查冷却系统是否存在故障。 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 cooling system based on the fault code.根据故障码排除冷却系统故障。

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。