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ELECTRIC POWER STEERING (EPS) CONTROL MODULE CONSTRUCTION/OPERATION
Construction
• The EPS control module is located in the engine compartment, on the underside of the PCM.
• The module calculates the proper assist current based on the steering force signal from the torque sensor
installed on the steering gear and linkage, and the vehicle and engine speed signals from the PCM using CAN
communication line, and then outputs the control current to the EPS motor.
Function Table
Control items
Motor current control
System overheating
prevention control
Self-diagnosis function
STEERING FORCE
SIGNAL
TORQUE SENSOR
VEHICLE SPEED
SIGNAL (CAN)
ENGINE SPEED
PCM
SIGNAL (CAN)
06–13–8
ELECTRIC POWER STEERING (EPS)
• Calculates the proper assist current based on the steering force, and vehicle and engine
speeds, and outputs a control current to the EPS motor.
• In order to prevent system overheating, motor current is controlled according to turning limit or
motor output control.
• A function that allows important parts of the control system to perform self-diagnosis. In case
a malfunction occurs, the EPS warning light illuminates to alert the driver, and at the same
time a DTC is stored in the EPS control module.
• As a result of the self-diagnosis, when a malfunction is determined, system control is
suspended or limited to prevent any dangerous occurrence while driving.
EPS CONTROL MODULE
ON-BOARD DIAGNOSIS
FUNCTION
Function
MOTOR CONTROL
CURRENT
IDLE SPEED
INCREASE REQUEST
SIGNAL (CAN)
EPS WARNING
LIGHT ON REQUEST
SIGNAL (CAN)
CHU061367880S01
EPS MOTOR
PCM
EPS WARNING
LIGHT
CHU0613S014
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