P14A913 - TroubleshootingP14A913-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
P14A913	Main relay control circuit is open主继电器控制电路开路	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 front compartment fuse检查前舱保险丝
	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. Open the electrical box in the front compartment and check whether fuse EF19/EF20 is blown.打开前舱电器盒，检查保险丝EF19/EF20是否熔断。 EF19：7.5A EF20：20A 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 Replace the fuse with the same specification.更换相同规格的保险丝。
③Check 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 Troubleshooting故障排除 No否 Go to step 4.去步骤4。
④Check the main relay control wiring harness检查主继电器控制线束
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. Disconnect the vehicle controller harness connector FB41.断开整车控制器线束接插件FB41。 3. Open the electrical box in the front compartment and pull out the main relay ER02.打开前舱电器盒，拔出主继电器ER02。 4. Use a digital multimeter to measure the resistance between pin 25 of FB41 and pin 1 of ER02 jack.用数字万用表测量FB41的25号针脚与ER02的1号针脚插孔之间的电阻。 Standard resistance value: <1标准电阻值：＜1 Ω 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 Repair or replace the main relay control wiring harness.维修或更换主继电器控制线束。
⑤Check the main relay output power harness检查主继电器输出电源线束
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. Disconnect the vehicle controller harness connector FB41.断开整车控制器线束接插件FB41。 3. Open the electrical box in the front compartment and pull out the main relay ER02.打开前舱电器盒，拔出主继电器ER02。 4. Use a digital multimeter to measure the resistance between pins 26/39 of FB41 and pin 5 of ER02.用数字万用表测量FB41的26/39号针脚与ER02的5号针脚插孔之间的电阻。 Standard resistance value: <1标准电阻值：＜1 Ω Are the test results normal?检查结果是否正常？ Yes是 Go to step 6.去步骤6。 No否 Repair or replace the main relay output power harness.维修或更换主继电器输出电源线束。
⑥Replace 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。