P0A0A29 - TroubleshootingP0A0A29-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
P0A0A29	high-voltage interlock (HVIL) circuit abnormality高压互锁回路异常	1. high-voltage interlock (HVIL) circuit failure1.高压互锁回路故障

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 and the low-voltage wiring harness of the high-voltage distribution box are damaged or broken.检查整车控制器和高压配电盒低压线束是否存在损坏、断裂等现象。 3. Check whether there are loose connections or damage to the vehicle controller and the low-voltage wiring harness connectors of the high-voltage distribution box.检查整车控制器和高压配电盒低压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 faulty wiring harness or connector.维修或更换故障线束或接插件。
②Check the high voltage distribution box检查高压配电盒
1. Check whether the high-voltage distribution box is connected correctly and whether the interlock pins on the corresponding high-voltage distribution box end are connected.检查高压配电盒是否正确连接及相应高压配电盒端互锁针脚是否导通。 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 Repair the high-voltage distribution box.检修高压配电盒。
③Check the high-voltage interlock (HVIL) signal wiring harness检查高压互锁信号线束
	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 connectors FB41 and FB42.断开整车控制器线束接插件FB41和FB42。 3. Use a digital multimeter to measure the resistance between pin 6 of FB41 and pin 57 of FB42.用数字万用表测量FB41的6号针脚与FB42的57号针脚之间的电阻。 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 4.去步骤4。 No否 Inspect the high-voltage interlock (HVIL) signal output and feedback wiring harness.检修高压互锁信号输出和反馈线束。
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。