Troubleshooting › Brake control system › Diagnosis
C003129-故障诊断 · T00612703

 C003129 - TroubleshootingC003129-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
C003129
Left front wheel speed circuit failure---signal failure左前轮轮速电路故障---信号故障
1. The acceleration value is in an unreasonable range for a long time or the edge signal value is unreasonable at low speed.1.加速度值长时间处于一个不合理的区间范围或在低速时边沿信号值不合理
2. Wheel speed exceeds threshold2.轮速超过阈值
3.ESP will check if the difference between the maximum and minimum wheel speed exceeds a certain threshold3.ESP会检查最大和最小轮速的差值如果超过一定门限
4. Detect whether the wheel speed signal is lost4.检测轮速信号是否丢失
Troubleshooting steps故障诊断步骤
①Power on check上电检查
1. Power on the vehicle again, keep the speed within a reasonable range, and wait for 5 seconds.车辆重新上电，车速保持在合理范围内，等待5秒。
2. Check whether the fault code and symptoms are eliminated.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。
②Read the data stream of the left front in-line wheel speed sensor读取左前直插式轮速传感器数据流
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 a diagnostic tool to read the data stream of the left front in-line wheel speed sensor and check whether the data stream is normal.使用诊断仪读取左前直插式轮速传感器数据流，查看数据流是否正常。
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 Inspect the left front in-line wheel speed sensor and its wiring.检修左前直插式轮速传感器及其线路。
③Replacing 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。