Mitsubishi Outlander (2013+). Manual — part 171

STEERING SHAFT AND COLUMN

ELECTRIC POWER STEERING (EPS)

37-4

STEERING SHAFT AND COLUMN

M2370002001046

The steering shaft and column, which informs the
EPS-ECU of steering effort on the steering wheel,
consist of a torque sensor and motors, etc. They are
designed to improve safety, and has the following
features:

• Shock absorbing mechanism has been adopted

to the steering column which absorbs the impact
energy at collision and provides safety to the
driver.

• Collapsible steering column has been employed.

During a collision, the steering wheel moves for-
ward.

• The adoption of the collapsible steering column

construction prevents the fallaway sections from
being affected by the impact at primary collision,
and stabilises the shock absorbing capability.
Also, the secondary collision impact is partially
absorbed by the collapsible steering column con-
struction, enhancing the collapse performance.

IMPACT-ABSORBING MECHANISM

PRIMARY COLLISION

ACB05495 AB

One-way capsule

Motor

Torque sensor

Tilt lever

Intermediate shaft

Steering column shaft

Contracting mechanism

A

View A

ACB05496AB

Before collision

After collision

Intermediate shaft (A)

Intermediate shaft (B)

Intermediate shaft (B)

Intermediate shaft (A)

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ELECTRIC POWER STEERING

ELECTRIC POWER STEERING (EPS)

37-5

When a vehicle crash occurs and the intermediate
shaft is loaded from the gearbox side, the intermedi-
ate shaft (A) is forced into the intermediate shaft (B)
to absorb an impact load. By this, a rearward out-
thrusting of steering column is prevented.

SECONDARY COLLISION

When the driver's body falls against the steering
wheel via the deployed air bag, the column bracket
moves forwards by deforming the rivet pin of the
one-way capsule.

ELECTRIC POWER STEERING

GENERAL INFORMATION

M2370000102169

Vehicle-speed sensitive electric power steering
(whole range type) has been adopted. This system
allows a light steering force during stationary steer-
ing manoeuvre or low speed driving, and a moderate
steering force during medium or high speed driving.
For vehicles with this system, the EPS-ECU controls
the motor current according to the vehicle speed and
steering force of the steering wheel.

CAN

*

communication has been adopted in order to

communicate with another ECUs for obtaining nec-
essary information related to this control, achieving
wiring harness saving and secure data communica-
tion.

NOTE:

*

: For more information about CAN (Control-

ler Area Network), refer to GROUP 54C, General
Information

P.54C-2

.

SPECIFICATIONS

ACB03550

Column
bracket

Column
pipe outer

One-way
capsule

Resin pin

Before collision

After collision

Sectional view B - B

B

B

A

A

Sectional view A - A

AB

Column
pipe inner

Item

Specification

Motor

Type

Permanent magnetic field type

Rated voltage V

DC 12

Rated current Arms

82

Torque sensor

Type

Noncontact type hole IC type

EPS-ECU

Control type

Microcomputer control (32 bit)

Rated voltage V

DC 12

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ELECTRIC POWER STEERING

ELECTRIC POWER STEERING (EPS)

37-6

GENERAL DESCRIPTION ON SYSTEM

To improve operational reliability, the dual-circuit sys-
tem has been adopted for the torque sensor. If any
malfunction occurs in the electric power steering sys-
tem, the fail-safe function of the EPS-ECU is acti-
vated, and the output current of the EPS-ECU
applied to the motor is turned off. At the same time,
the steering system enters manual mode, and

informs a driver of the system malfunction by illumi-
nating the warning lamp on the combination meter.
The warning lamp illuminates when the following
malfunctions occur: open circuit in the electric power
steering system wiring harness, poor connection,
malfunctions in the EPS-ECU, motor, or sensors.

ELECTRICAL PARTS AND FUNCTIONS

ACB05501AB

EPS-ECU

Motor

Torque sensor

Parts name

Description about function

Sensor

Wheel speed sensor (ABS-ECU
or ASC-ECU)

The vehicle speed signal is sent from the ABS-ECU or
ASC-ECU to the EPS-ECU via the engine-ECU.

Torque sensor

Detects a steering force, converts it into the voltage signal,
and then sends the signal to the EPS-ECU.

Actuator

Motor

Generates assist torque by the steering operation to the
column shaft using the signals sent from the EPS-ECU.

Electric power steering warning
lamp (in combination meter)

Warns a driver of the system malfunction using the signal
sent from the EPS-ECU.

EPS-ECU

Control the actuator (motor) based on the signal sent from
sensor.

Controls the self-diagnostic function and fail-safe function.

Controls diagnostic function (Compatible with M.U.T.-III).

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ELECTRIC POWER STEERING

ELECTRIC POWER STEERING (EPS)

37-7

SYSTEM CONFIGURATION

MOTOR

M2370001100122

The EPS motor receives the control current from the
EPS-ECU, and rotates in accordance with steering
operation. The rotational force generated by the EPS
motor is transmitted via the worm shaft and the
reduction gear to the column shaft.

ACB05502

EPS-ECU Power supply

Ignition switch

Torque sensor signal (main)

Earth

Torque sensor signal (sub)

Motor current

EPS-ECU

Torque sensor

Motor

Engine-ECU

ETACS-ECU

AWC-ECU

Output current value

Diagnosis
connector

Combination
meter

Engine speed

EPS warning lamp

Vehicle speed

Odometer

(distance information)

Diagnosis code output

Additional Torque

Diagnosis code allowed
to be stored

Steering column
shaft assembly

AB

NOTE: line indicates the CAN communication.

ACB05503 AB

A

A

Worm shaft

Reduction gear

Sectional view A - A

Motor

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