Troubleshooting › Cooling system › Diagnosis
U203881-故障诊断 · T00606759

 U203881 - TroubleshootingU203881-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
U203881
Slave node ECP communication failure从节点ECP通讯故障
1.LIN network failure1.LIN网络故障
2.ECP body failure2.ECP本体故障
Troubleshooting steps故障诊断步骤
①General inspection一般检查
1. Power status is "OFF", disconnect the negative terminal of the 12V battery.电源状态“OFF”,断开蓄电池负极。
2. Check the air conditioning compressor assembly wiring harness for damage, breakage, etc.检查空调压缩机总成线束是否存在损坏、断裂等现象。
3. Check whether there is any loose connection or damage to the air conditioning compressor assembly wiring harness connector.检查空调压缩机总成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 LIN communication waveform检查LIN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. Measure the LIN waveform with an oscilloscope.用示波器测量LIN波形。
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 Check the LIN communication harness; if normal, go to step 4.检查LIN通讯线束；若正常，去步骤4。
④Replace air conditioning compressor assembly更换空调压缩机总成
1. Replace the air conditioning compressor assembly with a new one and check whether the fault code and symptoms are eliminated.更换新的空调压缩机总成，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 Look for causes from other symptoms.从其他症状查找原因。