Troubleshooting › Cooling system › Diagnosis
B1C5F77-故障诊断 · T00606687

 B1C5F77 - TroubleshootingB1C5F77-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
B1C5F77
Internal and external air servo motor (driver) stalled内外气伺服电机（主驾）堵转
1. The driver's fresh/recirculation air servo motors are blocked.1.主驾内外气伺服电机发生堵转
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 left cycle actuator mechanical failure检查左循环执行器机械故障
1. Check whether the left cycle actuator is stuck by foreign objects.检查左循环执行器是否被异物卡滞。
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 Clean up foreign objects.清理异物。
③Check wiring harness and connectors检查线束及接插件
1. Check the left circulation actuator wiring harness for damage, breakage, etc.检查左循环执行器线束是否存在损坏、断裂等现象。
2. Check the left circulation actuator wiring harness connector for loose connection or damage.检查左循环执行器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。
④Replace left cycle actuator更换左循环执行器
1. Replace the left circulation actuator with a new one and check whether the fault code and symptoms are eliminated.更换新的左循环执行器，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 Go to step 5.去步骤5。
⑤Replacing the thermal management integrated module更换热管理集成模块
1. Replace the thermal management integrated module with a new one and check whether the fault code and symptoms are eliminated.更换新的热管理集成模块，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 thermal management integrated module, you need to use a diagnostic instrument to recalibrate the thermal management integrated module.更换热管理集成模块后，需用诊断仪对热管理集成模块重新标定。