such as steering wheel turning force (sensor signal) from the
torque sensor, vehicle speed signal, etc. Then it generates an opti-
mum assist torque signal to the EPS motor according to the driving
condition.

• When the power steering function is used continuously for an

extended period of time, such as when steering wheel is turned
while the vehicle is stopped, output is reduced to the EPS motor in
order to protect EPS motor and EPS control unit. At this time, the
assist torque gradually decreases and more force is required to
operate the steering wheel. However the normal assist torque returns after steering operation is discontin-
ued for a period of time.

• If there is a malfunction in the electrical system, the fail-safe function activates and turns OFF the output sig-

nal to the EPS motor, resulting in manual steering conditions. At this time, the power steering warning lamp
illuminates to notify the driver of the system malfunction.

• When the stop/start system operation starts, the EPS control unit receives a stop/start status signal from

ECM via CAN communication and disables the assist control.

• When the driver turns the steering wheel (torque application exceeding the specified torque) during stop/

start system operation, the EPS control unit transmits an EPS torque signal to ECM via CAN communication
and restarts the engine (disables stop/start system).

No.

Component

Function

Combination meter

• Transmits mainly the following signal to EPS control unit via CAN communica-

tion.

- Vehicle speed signal
• Receives mainly the following signal to EPS control unit via CAN communica-

tion.

- Power steering warning lamp signal

ECM

• Transmits mainly the following signals to EPS control unit via CAN communica-

tion.

- Engine status signal
- Stop/start status signal
• Receives mainly the following signal to EPS control unit via CAN communica-

tion.

- EPS torque signal
• Refer to

ECH-13, "Component Parts Location"

(HRA2DDT),

ECM-25, "EN-

GINE CONTROL SYSTEM : Component Parts Location"

, (MR16DDT),

ECM-

629, "ENGINE CONTROL SYSTEM : Component Parts Location"

(MR20DD),

ECK-12, "Component Parts Location"

(K9K) or

EC9-14, "Component Parts Lo-

cation"

(R9M) for detailed installation location.

ABS actuator and electric unit (control unit)

• Transmits mainly the following signal to EPS control unit via CAN communica-

tion.

- Vehicle speed signal
• Refer to

BRC-9, "Component Parts Location"

for detailed installation location.

Around view monitor control unit

• Transmits mainly the following signals to EPS control unit via CAN communica-

tion.

- Intelligent parking assist status signal
- Current command signal
• Refer to

AV-131, "Component Parts Location"

for detailed installation location.

EPS control unit

STC-9, "EPS Control Unit"

EPS motor

STC-10, "EPS Motor, Torque Sensor, Reduction Gear"

Torque sensor

STC-10, "EPS Motor, Torque Sensor, Reduction Gear"

Reduction gear

STC-10, "EPS Motor, Torque Sensor, Reduction Gear"

JSGIA1430ZZ

STC-10

< SYSTEM DESCRIPTION >

COMPONENT PARTS

• The intelligent parking assist status signal and current command signal are received from around view mon-

itor control unit via CAN communication for Intelligent Parking Assist control.

• The EPS control unit sends the Intelligent Parking Assist status signal to the around view monitor control unit

to indicate whether or not Intelligent Parking Assist control is possible.

• When the driver turns the steering wheel during Intelligent Parking Assist control, Intelligent Parking Assist

control is canceled.

• This enables diagnosis using CONSULT.

EPS Motor, Torque Sensor, Reduction Gear

INFOID:0000000010452099

NOTE:
The EPC control unit, EPS motor, torque sensor, and reduction gear are integrated with the steering column
ASSY.
EPS motor

, torque sensor

and reduction gear

are installed

to steering column assembly.

EPS MOTOR

EPS motor provides the assist torque by the control signal from EPS control unit.

TORQUE SENSOR

Torque sensor detects the steering torque, and transmit the signal to EPS control unit.

REDUCTION GEAR

Reduction gear increases the assist torque provided from EPS motor with worm gears, and outputs to the col-
umn shaft.

JSGIA1431ZZ

SYSTEM

STC-11

< SYSTEM DESCRIPTION >

STC

SYSTEM

EPS SYSTEM

EPS SYSTEM : System Description

INFOID:0000000010452102

SYSTEM DIAGRAM

INPUT/OUTPUT SIGNAL

Communicates the signal from each control unit via CAN communication.

DESCRIPTION

JMGIA0188GB

Control unit

Signal status

ECM

• Transmits mainly the following signals to EPS control unit via CAN communication.
- Engine status signal
- Stop/start status signal
• Receives mainly the following signal to EPS control unit via CAN communication.
- EPS torque signal

ABS actuator and electric unit (con-
trol unit)

• Transmits mainly the following signal to EPS control unit via CAN communication.
- Vehicle speed signal

Combination meter

• Transmits mainly the following signal to EPS control unit via CAN communication.
- Vehicle speed signal
• Receives mainly the following signal to EPS control unit via CAN communication.
- Power steering warning lamp signal

Around view monitor control unit

• Transmits mainly the following signals to EPS control unit via CAN communication.
- Intelligent parking assist status signal
- Current command signal

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