What Does the Exclamation Mark on the Steering Wheel Mean?

1 Answers
EdenLee
07/30/25 12:32am
An exclamation mark appearing on the steering wheel indicates the electronic power steering warning light, which disappears immediately after the engine starts. The Electric Power Steering (EPS) system is a power steering system that directly relies on an electric motor to provide auxiliary torque. Compared to the traditional Hydraulic Power Steering (HPS) system, the EPS system offers many advantages. The EPS system mainly consists of a torque sensor, vehicle speed sensor, electric motor, reduction mechanism, and electronic control unit (ECU). The electric power steering system evolved from the traditional mechanical steering system. It utilizes the power generated by an electric motor to assist the driver in steering operations. The system primarily consists of three major components: signal sensing devices (including torque sensors, angle sensors, and vehicle speed sensors), steering assist mechanisms (electric motor, clutch, reduction transmission mechanism), and electronic control devices. The electric motor operates only when assistance is needed. When the driver manipulates the steering wheel, the torque angle sensor generates corresponding voltage signals based on the input torque and steering angle. The vehicle speed sensor detects the speed signal, and the control unit issues commands to control the motor's operation based on the voltage and speed signals, thereby generating the required steering assistance.
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