P201813 - TroubleshootingP201813-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
P201813	Battery water temperature sensor open circuit电池出水温度传感器开路	1. The battery water temperature sensor is open circuit1.电池出水温度传感器开路

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 battery water temperature sensor wiring harness for damage, breakage, loose connection, etc.检查电池出水温度传感器线束是否存在损坏、断裂、虚接等现象。 3. Check the battery outlet temperature sensor harness connector for loose connection or damage.检查电池出水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 the battery outlet temperature sensor wiring harness or connector.维修或更换电池出水温度传感器线束或接插件。

②Check the battery water temperature sensor检查电池出水温度传感器

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 battery outlet temperature sensor harness connector.断开电池出水温度传感器线束接插件。 3. Use a digital multimeter to measure the resistance of the battery outlet water temperature sensor.用数字万用表测量电池出水温度传感器的电阻。 T-R value:T-R值： -40 ℃: Approximately 210.87K：约210.87K Ω -30 ℃: Approximately 120.09K：约120.09K Ω -20 ℃: Approximately 71.5K：约71.5K Ω -10 ℃: Approximately 43.93K：约43.93K Ω 0 ℃: Approximately 27.74K：约27.74K Ω 10 ℃: Approximately 18.02K：约18.02K Ω 20 ℃: Approximately 12.06K：约12.06K Ω 30 ℃: about 8.28K：约8.28K Ω 40 ℃: About 5.79K：约5.79K Ω 50 ℃: Approximately 4.14K：约4.14K Ω 60 ℃: About 3.01K：约3.01K Ω 70 ℃: About 2.22K：约2.22K Ω 80 ℃: about 1.66K：约1.66K Ω 90 ℃: about 1.26K：约1.26K Ω 100 ℃: about 0.97K：约0.97K Ω 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 Replace the battery water temperature sensor.更换电池出水温度传感器。

③Check the battery outlet temperature sensor circuit检查电池出水温度传感器线路

1. Check whether the battery water temperature sensor circuit is open.检查电池出水温度传感器线路是否开路。 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 the battery outlet temperature sensor wiring harness.维修或更换电池出水温度传感器线束。

④Replace the battery water temperature sensor更换电池出水温度传感器

1. Replace the battery water temperature sensor and check whether the fault code and symptoms are eliminated.更换电池出水温度传感器，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 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。