B1C1B11 - TroubleshootingB1C1B11-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
B1C1B11	External temperature sensor short circuit外温传感器短路	1. The wiring harness is short-circuited to ground1.线束对地短路

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 whether the outdoor air temperature sensor wiring harness is damaged or broken.检查外气温度传感器线束是否存在损坏、断裂等现象。 3. Check whether there is a loose connection or damage to the outside air temperature sensor harness connector.检查外气温度传感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 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。
②Check the outside air temperature sensor circuit检查外气温度传感器线路
	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 outside air temperature sensor harness connector FP11 and the thermal management integrated module harness connector FB44.断开外气温度传感器线束接插件FP11和热管理集成模块线束接插件FB44。 3. Use a digital multimeter to measure the resistance between pin 3/15 of FB44 and ground.用数字万用表测量FB44的3/15号针脚与接地之间的电阻。 Standard resistance value: >1M标准电阻值：＞1M Ω
	d. Connect the negative terminal of the 12V battery, and the power status is "ON".d.连接蓄电池负极，电源状态“ON”。 e. Use a digital multimeter to measure the voltage between pin 3/15 of FB44 and ground.e.用数字万用表测量FB44的3/15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 3.去步骤3。 No否 Repair or replace the outside air temperature sensor wiring harness.维修或更换外气温度传感器线束。
③Replace the outside air temperature sensor更换外气温度传感器
1. Replace the outdoor air temperature sensor with a new one and check whether the fault code and symptoms are eliminated.更换新的外气温度传感器，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 4.去步骤4。
④Replacing 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。