Steering Gear And Linkage - Mazda RX-8 2004 Service Highlights

Function of Component Parts
Part name
Torque sensor
Steering gear and
linkage
EPS motor
EPS control module
Vehicle speed signal
PCM
Engine speed signal
Instrument cluster EPS warning light
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STEERING GEAR AND LINKAGE CONSTRUCTION
• The steering gear and linkage consists of the steering rack, pinion shaft, EPS motor, ball screw and torque
sensor.
• The steering rack, which has a threaded groove, is inserted through the center of the EPS motor. The rotation
of the EPS motor (assist force) is transmitted via the balls inside the ball screw directly to the steering rack.
• The torque sensor, which detects the steering force, is installed on the pinion shaft.
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ELECTRIC POWER STEERING (EPS)
• Detects the steering force signal and inputs it to the EPS control
module.
• Generates an assist force based on the control current from the
EPS control module.
• Determines the control current for the EPS motor based on the
steering force signal from the torque sensor, vehicle speed signal
from the PCM and other signals.
• Inputs an idle increase request signal to the PCM via CAN
communication lines.
• Controls the on-board diagnostic system and fail-safe function
when an abnormality is detected in the EPS system.
• Inputs the vehicle speed signal to the EPS control module via CAN
communication lines.
• Inputs the engine speed signal to the EPS control module via CAN
communication lines.
• The light illuminates to inform the driver when a system malfunction
is detected.
BALL SCREW
EPS MOTOR
Function
TORQUE SENSOR
PINION SHAFT
STEERING RACK
06–13
CHU061332960S01
CHU0613S003
06–13–5