What does it mean when EPS appears on a vehicle?
2 Answers
When EPS appears on a vehicle, it indicates that the electronic stability system has malfunctioned or been turned off. The full English name of EPS is Electronic Power Steering, which refers to the electric power steering system. It uses the power generated by an electric motor to assist the driver in power steering. Below is relevant information about EPS: 1. Composition of EPS: Although the structural components may vary among different vehicles, they are generally similar. Typically, it consists of a torque (steering) sensor, electronic control unit, electric motor, reducer, mechanical steering gear, and battery power source. 2. When a car is in motion, it is subjected to lateral and longitudinal forces. If the lateral force is too great, the steering force can be significantly reduced, making the vehicle prone to losing control. EPS improves this situation by detecting unstable trends in the vehicle. Based on CPU calculations, the electric power steering system can independently brake each wheel and coordinate with the engine management system to ensure driving safety.
The other day while driving, I suddenly noticed the EPS light illuminated on the dashboard and was momentarily confused. After consulting a mechanic friend, I learned this indicates an issue with the Electric Power Steering system. He mentioned the most common causes are sensor failures - like when the sensor measuring steering wheel force malfunctions, making the steering wheel extremely heavy. It could also be due to poor wiring connections or problems with the steering angle sensor beneath the wheel. He advised me to stop driving immediately and first check the battery voltage, as voltage fluctuations can also trigger this warning light. During my last shop visit, they used a diagnostic tool and found it was just a loose sensor connection - reseating the connector fixed it. I recommend not forcing the vehicle to drive when this happens, as steering becomes dangerously heavy without power assist, especially during parking maneuvers.
