EPS System Description - Components
Components
The EPS system mainly consists of the following parts:
- EPS control unit
- EPS motor
- Torque sensor
- Steering gearbox
- System indicator
The EPS control unit, the EPS motor, and the torque sensor are combined into the steering gearbox.
For locations of each component on the vehicle, refer to the Component Location Index , and for functions of the indicator, refer to How to Troubleshoot the EPS .
The EPS system is a rack-assist type, and the steering gearbox is a dual pinion type, which includes two pinions that are engaged with a steering rack. The assist pinion shaft transmits the EPS motor power to the steering rack. The EPS motor power is transmitted to the worm wheel by the worm gear. The assist pinion shaft moves the steering rack with the EPS motor power that is increased and transmitted by the worm wheel. The manual pinion shaft transmits the steering torque from the steering wheel to the steering rack. The steering torque is transmitted from the steering column shaft to the input shaft, and the manual pinion shaft connecting with the input shaft by the torsion bar moves the steering rack.
Torque Sensor
The torque sensor is built into the steering gearbox, and uses a Hall IC sensor to detect steering wheel torque forces. The torque sensor consists of the input shaft, the torsion bar, the manual pinion shaft, and the torque sensor unit.