Component Description

Electronic Power Assist Steering (EPAS) Column 

The EPAS column is an assembly consisting of a PSCM, a variable speed reversible motor, a steering shaft torque sensor and a reduction gearset, all of which are serviced as an assembly with the steering column.

Power Steering Control Module (PSCM) 

The PSCM is the ECU for the EPAS system. The module monitors all sensor inputs and HS-CAN messages that relate to the EPAS system and directly controls the output of the EPAS motor.

Reduction Gearset 

The reduction gearset consists of a worm gear which is permanently attached to the steering shaft and a worm shaft connected to the rotor of the EPAS motor.

Steering Shaft Torque Sensor 

The steering torque sensor is mounted in the reduction gearset and is used by the PSCM to determine how much force is being used to turn the steering wheel and in which direction the steering wheel is being turned. This is accomplished using the electromagnetic induction between the sensor stator and the sensor rotor.