U018487 - TroubleshootingU018487-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
U018487	ACU message lostACU报文丢失	1.ACU node is offline1.ACU节点离线
		2.ACU node is damaged2.ACU节点损坏
		3. The ACU node does not send messages according to the scheduled period.3.ACU节点未按预定周期发出报文

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。
②General 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 infotainment head unit wiring harness is damaged or broken.检查车载智能多媒体主机线束是否存在损坏、断裂等现象。 3. Check whether there are loose connections or damage to the infotainment head unit wiring harness connector.检查车载智能多媒体主机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 3.去步骤3。 No否 Repair or replace faulty wiring harness or connector.维修或更换故障线束或接插件。
③Check the communication harness between the gateway controller and the infotainment head unit检查网关控制器与车载智能多媒体主机之间的通讯线束
	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 gateway controller harness connector IP62 and the vehicle infotainment head unit harness connector IP48.断开网关控制器线束接插件IP62和车载智能多媒体主机线束接插件IP48。 3. Use a digital multimeter to measure the resistance between pins 13/33 of IP62 and pins 21/22 of IP48.使用数字万用表测量IP62的13/33号针脚与IP48的21/22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 Repair or replace the faulty wiring harness.维修或更换故障线束。
④Check the car infotainment head unit检查车载智能多媒体主机
1. Power status "OFF".电源状态“OFF”。 2. Connect the diagnostic tool.连接诊断仪。 3. Power status "ON".电源状态“ON”。 4. Use the diagnostic tool to check whether the infotainment head unit system is normal.使用诊断仪检查车载智能多媒体主机系统是否正常。 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 Overhaul the infotainment head unit system.检修车载智能多媒体主机系统。
⑤Replace gateway controller更换网关控制器
1. Replace with a new gateway controller and check whether the fault code and symptoms are eliminated.更换新的网关控制器，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 gateway controller, you need to use a diagnostic tool to recalibrate the gateway controller.更换网关控制器后，需用诊断仪对网关控制器重新标定。