Troubleshooting › Body control system › Diagnosis
U019987-故障诊断 · T00607532

 U019987 - TroubleshootingU019987-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
U019987
FLDCM message lostFLDCM报文丢失
1. The FLDCM node is offline1.FLDCM节点离线
2. The FLDCM node is damaged2.FLDCM节点损坏
3. The FLDCM node does not send messages according to the scheduled period.3.FLDCM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 the left front door control module wiring harness for damage, breakage, etc.检查左前门控制模块线束是否存在损坏、断裂等现象。
3. Check the left front door control module harness connector for loose connection or damage.检查左前门控制模块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 left front door control module检查网关控制器与左前门控制模块之间的通讯线束
Graphic
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 left front door control module harness connector FL17.断开网关控制器线束接插件IP62和左前门控制模块线束接插件FL17。
3. Use a digital multimeter to measure the resistance between pins 13/33 of IP62 and pins 9/10 of FL17.使用数字万用表测量IP62的13/33号针脚与FL17的9/10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 left front door control module检查左前门控制模块
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 left front door control module system is normal.使用诊断仪检查左前门控制模块系统是否正常。
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 Inspect the left front door control module system.检修左前门控制模块系统。
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。