P180049 - TroubleshootingP180049-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
P180049	KL30 power supply voltage sampling circuit alarmKL30电源电压采样电路报警	1. 12V battery voltage fluctuates greatly1.蓄电池电压波动大
		2.DCDC output is abnormal2.DCDC输出不正常
		3. MCU power supply voltage sampling circuit failure3.MCU供电电压采样电路故障

Troubleshooting steps故障诊断步骤

①Power on check上电检查

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 2.去步骤2。

②Check 12V battery voltage检查蓄电池电压

Power status is "OFF", disconnect the negative terminal of the 12V battery.电源状态“OFF”,断开蓄电池负极。

Use a digital multimeter to measure the voltage between the positive and negative terminals of the 12V battery.用数字万用表测量蓄电池正、负极之间的电压。

Standard voltage value: about 12.5V标准电压值：约12.5V

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 DCDC output voltage检查DCDC输出电压

The vehicle is powered on.车辆上电。

Use a digital multimeter to measure the voltage between the positive and negative terminals of the 12V battery.用数字万用表测量蓄电池正、负极之间的电压。

Standard voltage value: about 14V标准电压值：约14V

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

Inspect DCDC and its lines.检修DCDC及其线路。

④Replacing the integrated electric drive assembly更换集成电力驱动总成

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。