Mitsubishi Outlander (2013+). Manual — part 490

TROUBLESHOOTING

ELECTRIC POWER STEERING (EPS)

37-31

YES :

Go to Step 3.

NO :

Replace the combination meter.

STEP 3. Voltage measurement at the EPS-ECU
connector (IG1, +BB, GND terminal)
(1) Measure the EPS-ECU voltage without

disconnecting the connector (by backprobing).

(2) Turn the ignition switch from the "LOCK" (OFF)

position to the "ON" position.

(3) Measure the voltage between the EPS-ECU

connector (IG1 terminal) and the EPS-ECU
connector (GND terminal) or body earth.

OK: Approximately system voltage

(4) Measure the voltage between the EPS-ECU

connector (+BB terminal) and the EPS-ECU
connector (GND terminal) or body earth.

OK: Approximately system voltage

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Go to Step 4.

STEP 4. Check of short to power supply, short to
earth, and open circuit in +BB line between
fusible link and EPS-ECU connector

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair the fusible link, connector(s) or
wiring harness.

STEP 5. Check of short to power supply, short to
earth, and open circuit in IG1 line between
EPS-ECU connector and ETACS-ECU connector

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the connector(s) or wiring harness.

STEP 6. Retest the system

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Cope with Intermittent

Malfunction ).

NO :

Replace the EPS-ECU (Refer to

P.37-51

).

Inspection Procedure 3: The steering has become heavy, but electric power steering warning display
does not illuminate. (Power supply voltage assist fall)

COMMENTS ON TROUBLE SYMPTOM

Intermittent failure may be present in the power sup-
ply system. Check the battery and the alternator to
confirm that normal direct voltage flows.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Defective battery

• Charging system failed

• Malfunction of the EPS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the CAN bus lines (Refer to GROUP
54C

− CAN Bus Diagnostics Table ).

STEP 2. M.U.T.-III data list
Check the following service data

P.37-32

.

• Item No. B11: Odometer:rec.V1

• Item No. B12: Power relay voltage:rec V1

• Item No. B13: Vehicle speed:rec.V1

• Item No. B21: Odometer:rec.V2

• Item No. B22: Power relay voltage:rec V2

• Item No. B23: Vehicle speed:rec.V2

• Item No. B31: Odometer:rec.V3

• Item No. B32: Power relay voltage:rec V3

• Item No. B33: Vehicle speed:rec.V3

• Item No. B41: Odometer:rec.V4

• Item No. B42: Power relay voltage:rec V4

• Item No. B43: Vehicle speed:rec.V4

• Item No. B51: Odometer:rec.V5

• Item No. B52: Power relay voltage:rec V5

• Item No. B53: Vehicle speed:rec.V5

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Check the combination meter and repair if
necessary (Refer to GROUP
54A

−combination meter ). Then go to Step

5.

TROUBLESHOOTING

ELECTRIC POWER STEERING (EPS)

37-32

STEP 3. Check the battery voltage.
Start the engine and measure the battery voltage
(Refer to GROUP 54A

− Battery Test ).

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Check the battery and repair if necessary
(Refer to GROUP 54A

− Charging System ,

Removal and Installation ).

STEP 4. Check the charging system.
Start the engine and measure the charging system
(Refer to GROUP 16

− Charging System ).

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Check the charging system and repair if
necessary (Refer to GROUP 16

− Alternator

Assembly ).

STEP 5. Retest the system

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Cope with Intermittent

Malfunction ).

NO :

Replace the EPS-ECU (Refer to

P.37-51

).

DATA LIST REFERENCE TABLE

M1372007700200

The following items can be read by the M.U.T.-III
from the EPS-ECU input data.

When the system is normal.

Item No.

Check item

Check condition

Normal condition

01

Torque sensor (main)

• Start the engine.

• Turn the steering

wheel with a vehicle
stationary.

Centre position

Approximately 2.5 V

Steering wheel
turned to right

2.5

− 4.7 V

Steering wheel
turned to left

0.3

− 2.5 V

02

Torque sensor (sub)

• Start the engine.

• Turn the steering

wheel with a vehicle
stationary.

Centre position

Approximately 2.5 V

Steering wheel
turned to right

2.5

− 0.3 V

Steering wheel
turned to left

4.7

− 2.5 V

03

Torque sensor (power
supply)

Start the engine.

4.7

− 5.3 V

04

Motor current

• Start the engine.

• Turn the steering wheel to the left and

right with a vehicle stationary.

Approximately 82 Arms or
less
(When the steering wheel
is not operated,
approximately battery
voltage)

05

Motor current (target)

• Start the engine.

• Turn the steering wheel to the left and

right with a vehicle stationary.

Approximately 82 Arms or
less
(When the steering wheel
is not operated,
approximately battery
voltage)

06

Motor current
(unlimited target)

• Start the engine.

• Turn the steering wheel to the left and

right with a vehicle stationary.

Approximately 82 Arms or
less

TROUBLESHOOTING

ELECTRIC POWER STEERING (EPS)

37-33

07

Engine speed

• Start the engine.

• Turn the steering wheel to the left and

right with a vehicle stationary.

Tachometer displayed
value and M.U.T.-III
displayed value agree with
each other.

08

Vehicle speed

• Start the engine.

• Turn the steering wheel to the left and

right with a vehicle stationary.

Speed meter displayed
value and M.U.T.-III
displayed value agree with
each other.

09

Add torque indication
status

• Start the engine.

• Vehicle stationary.

• S-AWC and EPS warning lamp turn off.

Approximately 0 Nm

11

Ignition switch

Ignition switch: LOCK (OFF)

OFF

Ignition switch: ON

ON

17

Motor electric angle

• Start the engine.

• Turn the steering wheel to the left and

right with a vehicle stationary.

0 - 360 deg

Motor angle

18

Motor speed

• Start the engine.

• Turn the steering wheel to the left and

right with a vehicle stationary.

Rated value: 1130 rpm
(neutral: 0 rpm)

19

Motor voltage

Start the engine.

2.1

− 11.7 V

22

Power relay voltage

Ignition switch: ON

Initialisation

Start the engine.

Battery voltage

23

Ignition voltage

Ignition switch: ON

Battery voltage

24

Power relay

Ignition switch: ON

OFF

Start the engine.

ON

25

Motor relay

Ignition switch: ON

OFF

Start the engine.

ON

A11

*

Odometer :rec.A1

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Odometer value

A12

*

Motor current (target)
:rec.A1

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Current value: 82 Arms or
less

A13

*

Motor cur. (unltd
target) :rec.A1

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Current value (before the
assist limitation)

A14

*

Motor current :rec.A1 Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Actual current value

A15

*

Vehicle speed :rec.A1 Assist limitation does not occur.

Initialisation

Assist limitation occurs.

CAN vehicle speed

A21

*

Odometer :rec.A2

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Odometer value

A22

*

Motor current (target)
:rec.A2

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Current value: 82 Arms or
less

Item No.

Check item

Check condition

Normal condition

TROUBLESHOOTING

ELECTRIC POWER STEERING (EPS)

37-34

A23

*

Motor cur. (unltd
target) :rec.A2

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Current value (before the
assist limitation)

A24

*

Motor current :rec.A2 Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Actual current value

A25

*

Vehicle speed :rec.A2 Assist limitation does not occur.

Initialisation

Assist limitation occurs.

CAN vehicle speed

A31

*

Odometer :rec.A3

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Odometer value

A32

*

Motor current (target)
:rec.A3

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Current value: 82 Arms or
less

A33

*

Motor cur. (unltd
target) :rec.A3

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Current value (before the
assist limitation)

A34

*

Motor current :rec.A3 Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Actual current value

A35

*

Vehicle speed :rec.A3 Assist limitation does not occur.

Initialisation

Assist limitation occurs.

CAN vehicle speed

A41

*

Odometer :rec.A4

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Odometer value

A42

*

Motor current (target)
:rec.A4

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Current value: 82 Arms or
less

A43

*

Motor cur. (unltd
target) :rec.A4

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Current value (before the
assist limitation)

A44

*

Motor current :rec.A4 Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Actual current value

A45

*

Vehicle speed :rec.A4 Assist limitation does not occur.

Initialisation

Assist limitation occurs.

CAN vehicle speed

A51

*

Odometer :rec.A5

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Odometer value

A52

*

Motor current (target)
:rec.A5

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Current value: 82 Arms or
less

A53

*

Motor cur. (unltd
target) :rec.A5

Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Current value (before the
assist limitation)

A54

*

Motor current :rec.A5 Assist limitation does not occur.

Initialisation

Assist limitation occurs.

Actual current value

Item No.

Check item

Check condition

Normal condition