Power Steering Function

The EPS control unit requires the following information to calculate the power steering required:
- Current steering moment from EPS torque sensor
- Current wheel speeds determined by each axle RPM sensor and made available by the electronic stability program control unit via CAN communication.
- Steering wheel angle and steering speed is sent by the steering wheel angle sensor in the steering column tube module control unit via CAN communication.
- Current engine speed (> 400 RPM) is send by ECM via CAN communication.
EPS control unit uses this information to calculate the steering assistance to be set from the stored characteristics map and activates the EPS actuator accordingly.

Courtesy of NISSAN NORTH AMERICA, INC.
The direction of rotation of the EPS actuator depends on the direction of movement of the steering wheel.
EPS system is transmitted from the EPS actuator to the rack-and-pinion steering gear, thereby supporting the steering torque applied by the driver.
When the vehicle is at a standstill, no power steering is available if the engine and ignition are switched off. With the stop/start function, reduced power steering is available when the vehicle is at a standstill if the engine was switched off by the stop/start function. The EPS system is deactivated after the ignition is switched off. Power steering is active if the vehicle is maneuvered when the engine is off and the ignition is switched on.