C003A12 - TroubleshootingC003A12-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
C003A12	Right rear wheel speed circuit failure---connect the battery右后轮轮速电路故障---接电池	1. The signal line of the right rear wheel speed sensor is short-circuited to the power supply.1.右后轮速传感器信号线与电源短接

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 right rear in-line wheel speed sensor wiring harness for damage, breakage, etc.检查右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 right rear direct-plug wheel speed sensor wiring harness connector for damage, loose connection, etc.检查右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 right rear in-line wheel speed sensor circuit检查右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 right rear in-line wheel speed sensor harness connector CA06.断开集成式制动控制单元线束接插件FB47和右后直插式轮速传感器线束接插件CA06。 3. Connect the negative terminal of the 12V battery and the power status is "ON".连接蓄电池负极，电源状态“ON”。 4. Use a digital multimeter to measure the voltage between pin 40 of FB47 and ground.用数字万用表测量FB47的40号针脚与接地之间的电压。 Standard voltage value: 0V标准电压值：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 faulty wiring harness.维修或更换故障线束。
③Replace the right rear in-line wheel speed sensor更换右后直插式轮速传感器
1. Replace with a new right rear in-line wheel speed sensor and check whether the fault code and symptoms are eliminated.更换新的右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。