Troubleshooting › Brake control system › Diagnosis
C15C21D-故障诊断 · T00612510

 C15C21D - TroubleshootingC15C21D-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
C15C21D
EPB left caliper left H bridge - abnormal currentEPB左卡钳左H桥-电流异常
1. The left motor harness is short-circuited1.左电机线束短路
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 the motor-integrated left rear caliper wiring harness检查电机集成式左后卡钳线束
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 integrated brake control unit harness connector FB47 and the motor-integrated left rear caliper harness connector CA02.断开集成式制动控制单元线束接插件FB47和电机集成式左后卡钳线束接插件CA02。
3. Use a digital multimeter to measure the resistance between pins 5 and 6 of the FB47.使用数字万用表测量FB47的5号针脚和6号针脚之间的电阻。
Standard resistance value: >1M标准电阻值：＞1M Ω
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 the faulty wiring harness.维修或更换故障线束。
③Replace the motor-integrated left rear caliper assembly更换电机集成式左后卡钳总成
1. Replace the motor-integrated left rear caliper assembly with a new one, and check whether the fault code and symptoms are eliminated.更换新的电机集成式左后卡钳总成，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 4.去步骤4。
④Replacing the integrated brake control unit更换集成式制动控制单元
1. Replace with a new integrated brake control unit and check whether the fault code and symptoms are eliminated.更换新的集成式制动控制单元，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 integrated brake control unit, you need to use a diagnostic tool to recalibrate the integrated brake control unit.更换集成式制动控制单元后，需用诊断仪对集成式制动控制单元重新标定。
♦  After replacing the integrated brake control unit, the brake line bleeding operation is required.更换集成式制动控制单元后，需进行制动管路排气操作。