Electric power steering system has no power电动助力转向系统无助力

①General inspection一般检查
1. Check whether the vehicle's suspension system is severely deformed or damaged.检查车辆悬架系统是否存在严重变形、损坏等现象。 Are the test results normal?检查结果是否正常？ Yes → Go to step 2.是>>去步骤2。 No → Repair or replace the faulty part.否>>维修或更换故障部件。
②Check mechanical steering gear检查机械转向器
1. Check whether the mechanical steering gear is deformed, cracked, damaged, etc.检查机械转向器是否存在变形、破裂、损坏等现象。 Are the test results normal?检查结果是否正常？ Yes → Go to step 3.是>>去步骤3。 No → Repair or replace the mechanical steering gear.否>>维修或更换机械转向器。
③Check the wiring harness connector检查线束接插件
1. Check whether the electric power steering column harness is damaged or broken.检查电动助力转向管柱线束是否存在损坏、断裂等现象。 2. Check the electric power steering column harness connector for loose connection or damage.检查电动助力转向管柱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 → Go to step 4.是>>去步骤4。 No → Repair or replace the faulty wiring harness or connector.否>>维修或更换故障线束或接插件。
④Check electric power steering column fault code检查电动助力转向管柱故障码
1. Use a diagnostic tool to read the electric power steering column fault code and check whether there is a fault in the electric power steering column.使用诊断仪读取电动助力转向管柱故障码，检查电动助力转向管柱是否存在故障。 Are the test results normal?检查结果是否正常？ Yes → Go to step 10.是>>去步骤10。 No → If the fault code can be read, troubleshoot according to the fault code; if communication cannot be performed, go to step 5.否>>若能读取故障码，根据故障码排除故障；若不能进行通讯，去步骤5。
⑤Check CAN communication line检查CAN通讯线路
1. Check whether the electric power steering column CAN communication line is normal.检查电动助力转向管柱CAN通讯线路是否正常。 Are the test results normal?检查结果是否正常？ Yes → Go to step 6.是>>去步骤6。 No → Check the CAN communication line.否>>检修CAN通讯线路。
⑥Check fuse检查保险丝
	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. Open the electrical box in the front compartment and check whether the EF34 fuse is blown.打开前舱电器盒，检查EF34保险丝是否熔断。 EF34：80A Are the test results normal?检查结果是否正常？ Yes → Go to step 7.是>>去步骤7。 No → Replace the fuse with the same specification.否>>更换相同规格的保险丝。
⑦Check the electric power steering column power circuit检查电动助力转向管柱电源线路
	1. Power status "ON".电源状态“ON”。 2. Use a digital multimeter to measure the voltage between pin 1 of the IP26 electric power steering column harness connector and ground.用数字万用表测量电动助力转向管柱线束接插件IP26的1号针脚与接地之间的电压。 Standard voltage value: about 14V标准电压值：约14V Are the test results normal?检查结果是否正常？ Yes → Go to step 8.是>>去步骤8。 No → Repair or replace the electric power steering column power wiring harness.否>>维修或更换电动助力转向管柱电源线束。
⑧Check the electric power steering column IG power circuit检查电动助力转向管柱IG电源线路
	1. Power status "ON".电源状态“ON”。 2. Use a digital multimeter to measure the voltage between pin 1 of the IP27 electric power steering column harness connector and ground.用数字万用表测量电动助力转向管柱线束接插件IP27的1号针脚与接地之间的电压。 Standard voltage value: about 14V标准电压值：约14V Are the test results normal?检查结果是否正常？ Yes → Go to step 9.是>>去步骤9。 No → Repair or replace the electric power steering column IG power supply harness.否>>维修或更换电动助力转向管柱IG电源线束。
⑨Check the electric power steering column ground circuit检查电动助力转向管柱接地线路
	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 electric power steering column harness connector IP26.断开电动助力转向管柱线束接插件IP26。 3. Use a digital multimeter to measure the resistance between pin 2 of the IP26 and ground.用数字万用表测量IP26的2号针脚与接地之间的电阻。 Standard resistance value: <1标准电阻值：＜1 Ω Are the test results normal?检查结果是否正常？ Yes → Go to step 10.是>>去步骤10。 No → Repair or replace the electric power steering column grounding harness.否>>维修或更换电动助力转向管柱接地线束。
⑩Replace the electric power steering column更换电动助力转向管柱
1. Replace the electric power steering column with a new one and check whether the fault is eliminated.更换新的电动助力转向管柱，检查故障是否排除。 Are the test results normal?检查结果是否正常？ Yes → Fault resolved.是>>故障排除。 No → Find the cause from other fault symptoms.否>>从其他故障现象查找原因。   Caution:注意： ♦  After replacing the electric power steering column, you need to use a diagnostic instrument to recalibrate the electric power steering column.更换电动助力转向管柱后，需用诊断仪对电动助力转向管柱重新标定。