Fault symptom table故障现象表
Using the chart below will help you find the cause of the problem, inspect each component in order, and repair or replace if necessary.使用下表将有助于找到问题的起因，按顺序检查每个部件，需要时维修或更换。
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No.序号
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Failure symptoms故障症状
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Possible reasons可能原因
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Solution解决办法
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1
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Steering heavy, stuck转向沉重、发卡
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1. The steering wheel is installed incorrectly1.方向盘安装不正确
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Reinstall the steering wheel重新安装方向盘
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2. Poor performance of torque sensor2.扭矩传感器性能不良
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Replace the electric power steering column assembly更换电动助力转向管柱总成
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3. The universal joint of the steering column intermediate shaft is worn or damaged.3.转向管柱中间轴万向节磨损或损坏
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Replace steering column drive shaft更换转向管柱传动轴
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4. The control unit is damaged4.控制单元损坏
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Replace the electric power steering column assembly更换电动助力转向管柱总成
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5. Steering tie rod ball head wear5.转向横拉杆球头磨损
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Replace steering tie rod ball joint更换转向横拉杆球头
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6. The electric power steering motor is damaged6.电动助力转向电机损坏
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Replace the electric power steering column assembly更换电动助力转向管柱总成
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2
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Electric power steering comes and goes电动助力转向时有时无
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1. Line break or short circuit1.线路断路或短路
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Inspection and maintenance检测维修
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2. The control unit is damaged2.控制单元损坏
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Replace the electric power steering column assembly更换电动助力转向管柱总成
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3. The electric power steering motor is damaged3.电动助力转向电机损坏
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Replace the electric power steering column assembly更换电动助力转向管柱总成
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3
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Steering deviation and incorrect return转向跑偏、回位不正
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1. The main signal of the torque sensor is offset or damaged1.扭矩传感器主信号偏移或损坏
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Replace the electric power steering column assembly更换电动助力转向管柱总成
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2. The steering angle signal is incorrect2.转向角信号不正确
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Replace the combination switch and recalibrate the angle sensor/EPS angle sensor更换组合开关，重新标定转角传感器/EPS角度传感器
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3. The electric power steering or motor is damaged3.电动助力转向器或电机损坏
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Replace the electric power steering column assembly更换电动助力转向管柱总成
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4
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Steering noise转向异响
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1. The steering drive shaft is installed incorrectly1.转向传动轴安装不正确
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Reinstall steering column drive shaft重新安装转向管柱传动轴
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2. Abnormal noise from the motor2.电机异响
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Replace the electric power steering column assembly更换电动助力转向管柱总成
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3. Insufficient lubrication of the electric power steering column bearing3.电动助力转向管柱轴承润滑不足
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Replace the electric power steering column assembly更换电动助力转向管柱总成
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5
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Steering wheel trembles方向盘发抖
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1. Front wheel balance weight is missing1.前车轮平衡块丢失
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Re-do tire dynamic balance test重新做轮胎动平衡测试
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2. The front brake disc is uneven2.前制动盘不平整
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Replace front brake disc更换前制动盘
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6
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Steering wheel free play is too large方向盘自由间隙过大
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1. The clearance of the universal joint of the steering intermediate shaft is too large or damaged1.转向中间轴万向节间隙过大或损坏
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Replace the electric power steering column assembly更换电动助力转向管柱总成
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2. The gap between the steering gear tie rod ball head is too large2.转向器横拉杆球头间隙过大
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Replace mechanical steering gear assembly更换机械转向器总成
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7
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Controller has no diagnostic communication控制器无诊断通讯
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1. The control unit power supply line is faulty and damaged.1.控制单元供电线路故障损坏
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Maintenance line检修线路
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2. The control unit power supply line is faulty and damaged.2.控制单元供电线路故障损坏
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Replace the electric power steering column assembly更换电动助力转向管柱总成
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3.CAN communication failure and damage3.CAN通讯故障损坏
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Repair CAN communication检修CAN通讯
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4.Gateway failure4.网关故障
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Replace gateway controller更换网关控制器
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8
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Electric power steering system has no power电动助力转向系统无助力
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1. The fuse is blown1.保险丝熔断
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2. Faulty wiring harness or connector2.线束或接插件故障
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3. Internal motor damage3.内部电机损坏
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4. Electric power steering column assembly failure4.电动助力转向管柱总成故障
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