Troubleshooting › Brake control system › Diagnosis
U007388-故障诊断 · T00607715

 U007388 - TroubleshootingU007388-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
U007388
bus off总线关闭
1.Circuit short circuit, open circuit or other1.电路短路、断路或其他
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。
②Check your surroundings检查周围环境
1. Check the surrounding environment for the presence of magnetic fields.检查周围环境是否存在磁场。
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 Drive away from the current situation.驶离当前所处环境。
③General 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 CAN communication harness is damaged or broken.检查CAN通讯线束是否存在损坏、断裂等现象。
3. Check the CAN communication harness connector for loose connections or damage.检查CAN通讯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 4.去步骤4。
No否 Repair or replace faulty wiring harness or connector.维修或更换故障线束或接插件。
④Check CAN communication waveform检查CAN通讯波形
1. Power status "OFF".电源状态“OFF”。
2. Connect the oscilloscope.连接示波器。
3. Power status "ON".电源状态“ON”。
4. Use an oscilloscope to measure the waveforms of CAN-H and CAN-L.用示波器测量CAN-H和CAN-L的波形。
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 Check the CAN communication harness; if normal, go to step 5.检查CAN通讯线束；若正常，去步骤5。
⑤Check other related systems on the CAN communication bus检查CAN通讯总线上其他相关系统
1. Check whether other related systems on the CAN bus are normal.检查CAN总线上其他相关系统是否正常。
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 related faulty systems.维修相关故障系统。
⑥Replace electronic parking control unit更换电子驻车控制单元
1. Replace the electronic parking control unit with a new one and check whether the fault code and symptoms are eliminated.更换新的电子驻车控制单元，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 electronic parking control unit, you need to use a diagnostic tool to recalibrate the electronic parking control unit.更换电子驻车控制单元后，需用诊断仪对电子驻车控制单元重新标定。