Troubleshooting › Driving and parking assistance systems › Diagnosis
U012987-故障诊断 · T00617075

 U012987 - TroubleshootingU012987-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
U012987
There is a fault in communication with IBCS and the message is lost.与IBCS通信存在故障，报文丢失
1. CAN communication abnormality in brake control system1.制动控制系统的CAN通信异常
2. The brake control system is damaged2.制动控制系统损坏
Troubleshooting steps故障诊断步骤
①General inspection一般检查
1. Check whether the ACANFD communication harness is damaged or broken.检查ACANFD通讯线束是否存在损坏、断裂等现象。
2. Check whether there is any loose connection or damage to the wiring harness connector.检查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。
②Power 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 3.去步骤3。
③Check for electromagnetic interference检查电磁干扰
1. Check for sources of magnetic fields around the vehicle.检查车辆周围是否存在磁场源。
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 Move the vehicle away from its current environment.使车辆驶离当前环境。
④Check brake control system fault codes检查制动控制系统故障码
1. Use a diagnostic tool to read the brake control system fault code and check whether there is a fault in the brake control system.使用诊断仪读取制动控制系统故障码，检查制动控制系统是否存在故障。
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 Troubleshoot the brake control system according to the fault code.根据故障码排除制动控制系统故障。
⑤Replace the combined inertial navigation module更换组合惯性导航模块
1. Replace with a new combined inertial navigation module and check whether the fault code and symptoms are eliminated.更换新的组合惯性导航模块，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 integrated inertial navigation module, you need to use a diagnostic instrument to recalibrate the integrated inertial navigation module.更换组合惯性导航模块后，需用诊断仪对组合惯性导航模块重新标定。