C003711 - TroubleshootingC003711-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
C003711	Left rear wheel speed circuit failure---open circuit/ground左后轮轮速电路故障---开路/接地	1. The signal line or power supply line of the left rear wheel speed sensor is short-circuited to the ground.1.左后轮速传感器信号线或供电线与地短接

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 left rear in-line wheel speed sensor wiring harness for damage, breakage, etc.检查左后直插式轮速传感器线束是否存在损坏、断裂等现象。 3. Check the left rear direct-plug wheel speed sensor wiring harness connector for damage, loose connection, etc.检查左后直插式轮速传感器线束接插件是否存在损坏、虚接等现象。 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 left rear in-line wheel speed sensor circuit检查左后直插式轮速传感器线路
	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 integrated brake control unit harness connector FB47 and the left rear in-line wheel speed sensor harness connector CA03.断开集成式制动控制单元线束接插件FB47和左后直插式轮速传感器线束接插件CA03。 3. Use a digital multimeter to measure the resistance between pin 38/23 of FB47 and pin 1/2 of CA03.使用数字万用表测量FB47的38/23号针脚与CA03的1/2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 38/23 of FB47 and ground.d.用数字万用表测量FB47的38/23号针脚与接地之间的电阻。 Standard resistance value: >1M标准电阻值：＞1M 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 Repair or replace the faulty wiring harness.维修或更换故障线束。
③Replace the left rear in-line wheel speed sensor更换左后直插式轮速传感器
1. Replace with a new left rear in-line wheel speed sensor and check whether the fault code and symptoms are eliminated.更换新的左后直插式轮速传感器，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 integrated brake control unit更换集成式制动控制单元
1. Replace with a new integrated brake control unit and check whether the fault code and symptoms are eliminated.更换新的集成式制动控制单元，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 integrated brake control unit, you need to use a diagnostic tool to recalibrate the integrated brake control unit.更换集成式制动控制单元后，需用诊断仪对集成式制动控制单元重新标定。 ♦  After replacing the integrated brake control unit, the brake line bleeding operation is required.更换集成式制动控制单元后，需进行制动管路排气操作。