P18044B - TroubleshootingP18044B-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
P18044B	Coolant overtemperature Level 3冷却液过温 Level3	1. There is a problem with the cooling of the motor controller1.电机控制器冷却出现问题
		2. Motor stalled operation2.电机堵转运行

Troubleshooting steps故障诊断步骤

①General inspection一般检查

1. Check whether the motor is stuck, rusted, or unable to rotate.检查电机是否存在卡滞、锈蚀、不能转动等现象。 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 Go to step 6.去步骤6。

②Check 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 4.去步骤4。 No否 Go to step 3.去步骤3。

③Check 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 4.去步骤4。 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。

④Check the motor cooling system fault code检查电机冷却系统故障码

1. Use a diagnostic tool to read the motor cooling system fault code and check whether there is a fault in the motor cooling system.使用诊断仪读取电机冷却系统故障码，检查电机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 motor cooling system according to the fault code.根据故障码排除电机冷却系统故障。

⑤Cooling 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 6.去步骤6。

⑥Replacing 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。