P14A912 - TroubleshootingP14A912-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
P14A912	Main relay control circuit short power supply主继电器控制电路短电源	1. Hardware underlying failure1.硬件底层故障

Troubleshooting steps故障诊断步骤

①General inspection一般检查
1. Power state is "OFF", disconnect the negative terminal of the 12V battery.电源状态“OFF”，断开蓄电池负极。 2. Check whether the vehicle controller wiring harness is damaged or broken.检查整车控制器线束是否存在损坏、断裂等现象。 3. Check whether there are loose connections or damage to the vehicle controller wiring harness connector.检查整车控制器线束接插件是否存在虚接、损坏等现象。 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 Repair or replace the vehicle controller wiring harness or connector.维修或更换整车控制器线束或接插件。
②Check main relay检查主继电器
	1. Replace the main relay ER02 with the same specification and check whether the fault code and symptoms are eliminated.更换相同规格的主继电器ER02，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 3.去步骤3。
③Check the main relay control wiring harness检查主继电器控制线束
1. Power status "OFF".电源状态“OFF”。 2. Open the electrical box in the front compartment and pull out the VCU main relay ER02.打开前舱电器盒，拔出VCU主继电器ER02。 3. Power status "ON".电源状态“ON”。 4. Use a digital multimeter to measure the voltage between the ER02's pin 1 jack and ground.用数字万用表测量ER02的1号针脚插孔与接地之间的电压。 Standard voltage value: 0V标准电压值：0V 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 Repair or replace the main relay control wiring harness.维修或更换主继电器控制线束。
④Replace vehicle controller更换整车控制器
1. Replace the vehicle controller with a new one and check whether the fault code and symptoms are eliminated.更换新的整车控制器，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 vehicle controller, you need to use a diagnostic tool to recalibrate the vehicle controller.更换整车控制器后，需用诊断仪对整车控制器重新标定。