Mitsubishi Outlander (2013+). Manual — part 486

TROUBLESHOOTING

ELECTRIC POWER STEERING (EPS)

37-15

(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 code C1514 set?

YES :

Replace the EPS-ECU (Refer to

P.37-51

).Then go to Step 7.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunctions ).

STEP 7. 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 code C1514 set?

YES :

Replace the steering column shaft

assembly (Refer to

P.37-43

). Then go to

Step 8.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunctions ).

STEP 8. 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 code C1514 set?

YES :

Return to Step 1.

NO :

This diagnosis is complete.

Code No.C1521 Motor turning angle (output)

Code No.C1522 Motor turning angle range

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

Power is supplied to the resolver from the EPS-ECU.

FUNCTION

To output the voltage based on the motor rotation
angle to the EPS-ECU, the voltage is supplied to the
resolver.

TROUBLE JUDGEMENT

Check Conditions
The power supply circuit system diagnosis code (No.
C1540, C1541) is not set.

Judgement Criterion
The resolver input voltage or the resolver output volt-
age does not meet a predetermined voltage stored in
the microcomputer, and the microcomputer deter-
mines that there is a problem in the resolver system.

Fail Safe, Back Up Function
The EPS-ECU stops the motor control and illumi-
nates the electric power steering warning display,
then sets the diagnosis code No. C1521 and C1522.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Defective resolver of the steering column shaft

assembly

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

• Short or open circuit between the EPS-ECU

and the resolver or loose connector contact

• 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 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 C1521 or C1522 set?

YES :

Go to Step 3.

NO :

This diagnosis is complete.

TROUBLESHOOTING

ELECTRIC POWER STEERING (EPS)

37-16

STEP 3. Check of short to power supply, short to
earth, and open circuit in S1+, S3

−, S2+, S4−,

R1+, R2

− line between EPS-ECU connector and

resolver

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 6.

STEP 4. M.U.T.-III data list
Check the following data list

P.37-32

.

• Item No. 04: Motor current

• Item No. 05: Motor current (target)

• Item No. 17: Motor electric angle

• Item No. 18: Motor speed

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Go to Step 7.

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 C1521 or C1522 set?

YES :

Replace the EPS-ECU (Refer to

P.37-51

).Then go to Step 6.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunctions ).

STEP 6. 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 C1521 or C1522 set?

YES :

Replace the steering column shaft

assembly (Refer to

P.37-48

).Then go to

Step 7.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunctions ).

STEP 7. 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 C1521 or C1522 set?

YES :

Return to Step 1.

NO :

This diagnosis is complete.

Code No.C1530 Motor FET driver

Code No.C1531 Motor current too low

Code No.C1532 Motor output current too large

Code No.C1533 Motor terminal initial voltage

Code No.C1534 Motor terminal monitor voltage

Code No.C1535 Motor output current

Code No.C1536 Motor terminal voltage too high

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

Power is supplied to the motor from the EPS-ECU.

FUNCTION

The voltage controlled by the torque sensor and
resolver is supplied to the motor from the EPS-ECU.

TROUBLE JUDGEMENT

Check Conditions
The battery voltage is more than 8 V or less than 17
V.

TROUBLESHOOTING

ELECTRIC POWER STEERING (EPS)

37-17

Judgement Criterion
The motor voltage does not meet a predetermined
voltage stored in the microcomputer, and the micro-
computer determines that there is a problem in the
motor system.

Fail Safe, Back Up Function
The EPS-ECU stops the motor control and illumi-
nates the electric power steering warning display,
then sets the diagnosis code No. C1530, C1531,
C1532, C1533, C1534, C1535, and C1536.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Defective motor of the steering column shaft

assembly

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

• Short or open circuit between the EPS-ECU

and the motor or loose connector contact

• Open circuit between the body earth and the

EPS-ECU or loose connector contact

• 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 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

C1530,C1531,C1532,C1533,C1534,C1535 or C1536
set?
YES :

Go to Step 3.

NO :

This diagnosis is complete.

STEP 3. Check of short to power supply, short to
earth, and open circuit in V, W, U line between
EPS-ECU connector and motor

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 7.

STEP 4. Check of open circuit in GND line
between EPS-ECU connector and body earth
connector

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Go to Step 7.

STEP 5. M.U.T.-III data list
Check the following data list

P.37-32

.

• Item No. 04: Motor current

• Item No. 05: Motor current (target)

• Item No. 06: Motor current (unlimited target)

• Item No. 17: Motor electric angle

• Item No. 18: Motor speed

• Item No. 19: Motor voltage

• Item No. 25: Motor relay

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Go to Step 6.

STEP 6. 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

C1530,C1531,C1532,C1533,C1534,C1535 or C1536
set?
YES :

Replace the EPS-ECU (Refer to

P.37-51

).Then go to Step 7.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunctions ).

STEP 7. 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

C1530,C1531,C1532,C1533,C1534,C1535 or C1536
set?
YES :

Replace the steering column shaft

assembly (Refer to

P.37-48

).Then go to

Step 8.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunctions ).

TROUBLESHOOTING

ELECTRIC POWER STEERING (EPS)

37-18

STEP 8. 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

C1530,C1531,C1532,C1533,C1534,C1535 or C1536
set?
YES :

Return to Step 1.

NO :

This diagnosis is complete.

Code No.C1540 Power supply voltage too high

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

Power is supplied to the EPS-ECU from the battery
or the ignition switch.

FUNCTION

To control the steering column shaft assembly, the
battery voltage is supplied to the EPS-ECU.

TROUBLE JUDGEMENT

Check Conditions

• Power supply voltage is more than 17 V.

• The power supply voltage is more than a prede-

termined voltage stored in the microcomputer,
and the microcomputer determines that there is a
problem in the power supply system.

Judgement Criterion
The power supply monitor voltage does not meet a
predetermined voltage stored in the microcomputer,
and the microcomputer determines that there is a
problem in the power supply system.

Fail Safe, Back Up Function
The EPS-ECU stops the motor control and illumi-
nates the electric power steering warning display,
then sets the diagnosis code No. C1540.

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 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 code C1540 set?

YES :

Go to Step 3

NO :

This diagnosis is complete.

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

− Battery ).

Q: Is the check result normal?

YES :

Go to Step 4

NO :

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

− Battery ).Then go

to Step 7.

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

− On−vehicle Service/Alterna-

tor Output Line Voltage Drop Test ).

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 ).Then go to Step 7.