System Description [12/2011 - ]

DESCRIPTION
1. The power steering system generates assist torque to assist steering effort through the operation of the motor installed to the power steering link assembly.
  The direction and amount of power assist are determined by signals from the torque sensor and controlled in accordance with vehicle speed. As a result, steering effort is controlled so that it is light during low speed driving and moderately high during high speed driving.

FUNCTIONS OF COMPONENTS

Component		Function
Steering sensor		Detects the steering angle and the direction the steering wheel is turned.
Speed sensor		Detects wheel speeds.
Power steering link assembly	Torque sensor	By detecting the twist of the steering torsion bar, the sensor determines the torque that is applied to the torsion bar using an electrical signal to detect the steering torque, and sends this value to the power steering ECU.
	Motor rotation angle sensor	Detects the motor rotation angle of the power steering motor and transmits it to the power steering ECU.
	Power steering motor	Generates power assist in accordance with the actuation current received from the power steering ECU.
	Reduction assembly	Reduces the gear ratio and transmits motor torque to the rack shaft.
Power steering ECU		Actuates the power steering motor to provide power assist based on the signals received from various sensors and ECUs. When the power steering ECU detects a power steering system malfunction, it sends a warning signal to the combination meter assembly.
Air conditioning amplifier assembly		Receives a load control request signal from the power steering ECU and limits operation of heater systems.
Skid control ECU		Sends the vehicle speed signal and steering torque assist cooperative control signal to the power steering ECU.
VGRS ECU (front steering control ECU) (w/ variable gear ratio steering system)		Sends the front wheel angle signal to the power steering ECU.
DRS ECU (rear steering control ECU) (w/ dynamic rear steering system)		Sends the rear wheel angle signal to the power steering ECU.
Absorber control ECU (w/ adaptive variable suspension system)		Sends the sport mode switch signal to the power steering ECU.
Driving support ECU (w/ lane-keeping assist system)		Sends the target steering torque signal to the power steering ECU.
ECM		Sends the engine speed signal to the power steering ECU. Sends the sport mode switch signal to the power steering ECU (w/o adaptive variable suspension system).
Combination meter assembly		Illuminates the power steering warning light to alert the driver when there is a malfunction in the power steering system or the power source voltage is low. Blinks the power steering warning light to output DTCs during diagnosis mode. Displays a message in the multi-information display to alert the driver when there is a malfunction in the power steering system.