P200702 - TroubleshootingP200702-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
P200702	Electronic fan LIN response failure电子风扇LIN响应故障	1. External interference1.外界干扰
		2.Fan failure2.风扇故障
		3. The LIN communication line is open or short-circuited3.LIN通讯线开路、短路

Troubleshooting steps故障诊断步骤

①General 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 the electronic fan wire harness for damage, breakage, loose connection, etc.检查电子风扇线束是否存在损坏、断裂、虚接等现象。 3. Check the electronic fan harness connector for loose connection or damage.检查电子风扇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 electronic fan harness or connector.维修或更换电子风扇线束或接插件。
②Check your surroundings检查周围环境
1. Check the surrounding environment for sources of magnetic fields.检查周围环境是否存在磁场源。 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。
③Check the LIN waveform with an oscilloscope用示波器检查LIN波形
1. Use an oscilloscope to check whether the LIN waveform is normal.用示波器检查LIN波形是否正常。 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 Go to step 4.去步骤4。
④Check the LIN communication harness between the thermal management integrated module and the electronic fan检查热管理集成模块与电子风扇之间的LIN通讯线束
	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 thermal management integrated module harness connector FB43 and the electronic fan harness connector FB27.断开热管理集成模块线束接插件FB43和电子风扇线束接插件FB27。 3. Use a digital multimeter to measure the resistance between pin 8 of FB43 and pin 1 of FB27.用数字万用表测量FB43的8号针脚与FB27的1号针脚之间的电阻。 Standard resistance value: <1标准电阻值：＜1 Ω
	d. Use a digital multimeter to measure the resistance between pin 1 of FB27 and ground.d.用数字万用表测量FB27的1号针脚与接地之间的电阻。 Standard resistance value: >1M标准电阻值：＞1M Ω
	e. Connect the negative terminal of the 12V battery, and the power status is "ON".e.连接蓄电池负极，电源状态“ON”。 f. Use a digital multimeter to measure the voltage between pin 1 of FB27 and ground.f.用数字万用表测量FB27的1号针脚与接地之间的电压。 Standard voltage value: about 0V标准电压值：约0V 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 Repair or replace the LIN communication harness between the thermal management integrated module and the electronic fan.维修或更换热管理集成模块与电子风扇之间的LIN通讯线束。
⑤Replace electronic fan更换电子风扇
1. Replace the electronic fan with a new one and check whether the fault code and symptoms are eliminated.更换新的电子风扇，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 6.去步骤6。
⑥Replacing 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。