P20021D - TroubleshootingP20021D-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
P20021D	Hardware overcurrent fault of electric oil pump电动油泵的硬件过流故障	1. Severe load fluctuations1.负载波动剧烈
		2. A stall occurs2.发生堵转
		3. The current sampling circuit on the hardware is damaged.3.硬件上电流采样电路损坏

Troubleshooting steps故障诊断步骤

①Power on check上电检查

1. 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 the load检查负载情况

1. Check whether the load condition is normal.检查负载情况是否正常。 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 Reduce the load.减轻负载。

③Check operation检查运行情况

1. Check if stalling occurs.检查是否发生堵转。 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 Eliminate blocking factors.清除堵转因素。

④Replace oil pump controller更换油泵控制器

1. Replace the oil pump controller with a new one and check whether the fault code and symptoms are eliminated.更换新的油泵控制器，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 oil pump controller, you need to use a diagnostic instrument to recalibrate the oil pump controller.更换油泵控制器后，需用诊断仪对油泵控制器重新标定。