Mitsubishi Outlander (2013+). Manual - part 489

TROUBLESHOOTING

ELECTRIC POWER STEERING (EPS)

37-27

STEP 4. Check whether the diagnosis code is 
reset
(1) Erase the diagnosis code.
(2) Turn the ignition switch from the LOCK (OFF) 

position to the ON position.

(3) Check if the diagnosis code is set.

Q: Is the diagnosis codes U0100, U0114 or U0141 set?

YES : 

Replace the EPS-ECU (Refer to 

P.37-51

 ). 

Then go to Step 5.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunction ).

STEP 5. Check whether the diagnosis code is 
reset
(1) Erase the diagnosis code.
(2) Turn the ignition switch from the LOCK (OFF) 

position to the ON position.

(3) Check if the diagnosis code is set.

Q: Is the diagnosis codes U0100, U0114 or U0141 set?

YES : 

Return to Step 1.

NO : 

This diagnosis is complete.

Code No. U1073 Bus-off

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect diagnosis code may be set. Prior 
to this diagnosis, diagnose the CAN bus lines 
(Refer to GROUP 54C, CAN Bus Diagnostics 
Table).

• Whenever ECU is replaced, ensure that the 

CAN bus lines are normal.

OPERATION

Signals from the ECUs communicate with the 
EPS-ECU.

FUNCTION

The signals from the ECUs communicate with the 
EPS-ECU for motor control.

TROUBLE JUDGEMENT

Check Conditions
IG1 voltage: 10 V or more

Judgement Criterion
The signals from the ECUs cannot communicate 
(bus off), and the microcomputer determines that 
there is a problem in the system.

Fail Safe, Back Up Function
The EPS-ECU displays the electric power steering 
warning symbol, and stores diagnosis code No. 
U1073.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of the EPS-ECU

Code No. U1190 No receive fault detect signal

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect diagnosis code may be set. Prior 
to this diagnosis, diagnose the CAN bus lines 
(Refer to GROUP 54C, CAN Bus Diagnostics 
Table).

• Whenever ECU is replaced, ensure that the 

CAN bus lines are normal.

OPERATION

A fault detection enabling/inhibiting signal is sent 
from the ETACS-ECU to the EPS-ECU.

TROUBLE JUDGEMENT

Check Conditions
Ignition switch: ON position

Judgement Criterion
When the microcomputer cannot receive any fault 
detection enabling/inhibiting signal from the 
ETACS-ECU, it determines that there is a problem in 
the system.

Fail Safe, Back Up Function
The EPS-ECU stores diagnosis code No. U1190.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of the ETACS-ECU

TROUBLESHOOTING

ELECTRIC POWER STEERING (EPS)

37-28

Code No. U1195 Coding not completed

 

Code No. U1197 Coding data unavailable

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect diagnosis code may be set. Prior 
to this diagnosis, diagnose the CAN bus lines 
(Refer to GROUP 54C, CAN Bus Diagnostics 
Table).

• Whenever ECU is replaced, ensure that the 

CAN bus lines are normal.

OPERATION

EPS-ECU receives variant coding data from the 
ETACS-ECU.

FUNCTION

The coding data is sent to the EPS-ECU for motor 
control.

TROUBLE JUDGEMENT

Check Conditions

• The power supply circuit system diagnosis code 

(No. C1540, C1541) is not set.

• The ETACS circuit system diagnosis code is not 

set.

Judgement Criterion

• The electric power steering-ECU coding is not 

completed.

• The abnormal coding data is sent from the 

ETACS-ECU, and the microcomputer determines 
that there is a problem in the system.

Fail Safe, Back Up Function
The EPS-ECU prohibits the motor control, and stores 
diagnosis codes No. U1195 and U1197.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of the EPS-ECU

• Malfunction of the ETACS-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 3

NO : 

Repair the CAN bus lines (Refer to GROUP 
54C 

− CAN Bus Diagnostics Table ). On 

completion, go to Step 2

STEP 2. Diagnosis code recheck after resetting 
CAN bus lines
(1) Erase the diagnosis code.
(2) Turn the ignition switch from the "LOCK" (OFF) 

position to the "ON" position.

(3) Check if the diagnosis code is set.

Q: Is the diagnosis codes U1195, U1197 set?

YES : 

Go to Step 3

NO : 

This diagnosis is complete.

STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check whether the 
ETACS-ECU-related or engine ECU-related diagno-
sis code is set or not.

Q: Is any diagnosis code set?

YES : 

Troubleshoot for the relevant diagnosis 

code.

NO : 

Go to Step 4

STEP 4. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from the "LOCK" (OFF) 

position to the "ON" position.

(3) Check if the diagnosis code is set.

Q: Is the diagnosis codes U1195, U1197 set?

YES : 

Replace the EPS-ECU (Refer to 

P.37-51

). 

Then go to Step 5.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunction .

STEP 5. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from the "LOCK" (OFF) 

position to the "ON" position.

(3) Check if the diagnosis code is set.

Q: Is the diagnosis codes U1195, U1197 set?

YES : 

Return to Step 1.

NO : 

This diagnosis is complete.

TROUBLESHOOTING

ELECTRIC POWER STEERING (EPS)

37-29

TROUBLE SYMPTOM CHART

M1372007600496

CAUTION

During diagnosis, a diagnosis code associated with other system may be set when the ignition switch 
is turned on with connector(s) disconnected. On completion, confirm all systems for diagnosis 
code(s). If diagnosis code(s) are set, erase them all.

Trouble symptom

Inspection 
procedure

Reference pages or 
actions

M.U.T.-III cannot communicate with electric power steering 
system <ECU power supply circuit system check>.

1 

P.37-29

Electric power steering system warning display illuminates 
but diagnosis code is not stored.

2

P.37-30

The steering has become heavy, but the electric power 
steering warning display does not illuminate (This is normal, 
because the electric power steering is limiting assist 
operation).

NOTE: If the vehicle is driven under heavy load (e.g. 
consecutively turning the steering to full lock or severe 
cornering), the electric power steering motor drive circuit will 
become hot. In this case, the electric power steering system 
will limit assist operation by decreasing the motor current to 
avoid damage. In this case, the steering will become heavy, 
but the electric power steering warning lamp does not 
illuminate. If the circuit temperature reduces after a while, 
the assist operation will return to the normal level.

−

Reproduce the steering 
operation, which your 
customer did. Check the 
M.U.T.-III data list item to 
No.A55 from No.A11, and 
confirm that the electric 
power steering system 
limited the assist 
operation (Refer to 

P.37-32

). Note that this is 

not a failure.

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

NOTE: If the system voltage is lower than the rated value, 
motor rated output does not come out.

3

P.37-31

When the ignition switch is turned on, the system does not 
perform the bulb check for the electric power steering 
warning lamp (The electric power steering warning lamp 
does not illuminate until the engine is started).

NOTE: The ignition switch is turned to the ON position 
(within approximately 3 second) again immediately after it is 
turned to the LOCK (OFF) position, the electric power 
steering warning lamp does not illuminate.

−

Replace the meter 
assembly (Refer to 
GROUP 54A 

− 

Combination Meter ).

SYMPTOM PROCEDURES

Inspection Procedure 1: M.U.T.-III cannot communicate with electric power steering system <ECU 
power supply circuit system check>.

COMMENTS ON TROUBLE SYMPTOM

If the M.U.T.-III cannot communicate with the electric 
power steering system, the CAN bus lines may be 
defective. If the electric power steering system does 
not operate, the EPS-ECU or its power supply may 

be defective.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Defective harness wire(s) or connector(s)

TROUBLESHOOTING

ELECTRIC POWER STEERING (EPS)

37-30

• Short or open circuit between the EPS-ECU 

and the ETACS-ECU, the fusible link or loose 
connector contact

• Open circuit between the body earth and the 

EPS-ECU or loose connector contact

• Malfunction of the ETACS-ECU

• 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. 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 5.

NO : 

Go to Step 3.

STEP 3. 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 4.

NO : 

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

STEP 4. 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 5.

NO : 

Repair the connector(s) or wiring harness.

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

).

Inspection Procedure 2: Electric power steering system warning display illuminates but diagnosis 
code is not stored.

COMMENTS ON TROUBLE SYMPTOM

The CAN bus lines may be defective. If the electric 
power steering system does not operate, the combi-
nation meter or the EPS-ECU may be defective.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Defective harness wire(s) or connector(s)

• Short or open circuit between the EPS-ECU 

and the ETACS-ECU, the fusible link or loose 
connector contact

• Open circuit between the body earth and the 

EPS-ECU or loose connector contact

• Malfunction of the ETACS-ECU

• Malfunction of the combination meter

• 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. Check by M.U.T.-III "Special Function"
Using M.U.T.-III, select "Test" from the special func-
tion of the combination meter. Execute the following 
item to check the liquid crystal display. (Refer to 
GROUP 54A 

− Combination Meter )

• Item 2: LCD(AUTO)

Q: Is the check result normal?