Mitsubishi Grandis. Manual — part 773

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-343

STEP 9. Perform voltage measurement at A-26
fan controller connector.

• Disconnect connector, and measure at harness

side.

• Ignition switch: ON

• Voltage between terminal No. 3 and earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 13 .

NO :

Go to Step 10 .

STEP 10. Check harness between A-13X
(terminal No. 2) fan control relay connector and
A-26 (terminal No. 3) fan controller connector.

• Check power supply line for open/short circuit.

Q: Is the check result normal?

YES :

Go to Step 11 .

NO :

Repair.

STEP 11. Connector check: B-15X engine control
relay connector

Q: Is the check result normal?

YES :

Go to Step 12 .

NO :

Repair or replace.

STEP 12. Check harness between B-15X
(terminal No. 1) engine control relay connector
and A-13X (terminal No. 3) fan control relay
connector.

NOTE: Before checking harness, check intermediate
connectors A-16 and C-116, and repair if necessary.

• Check power supply line for damage.

Q: Is the check result normal?

YES :

Check and repair harness between A-13X

(terminal No. 1) fan control relay connector
and A-25 (terminal No. 5) earth connector.

• Check earthing line for damage.

NO :

Repair.

AK300999

1

2

3

AC

Harness side connector

Connector: A-26

A-26 (GR)

AK301004

3

1

2

4

AC

Connector: A-13X

A-13X

Harness side
connector

AK300999

1

2

3

AC

Harness side connector

Connector: A-26

A-26 (GR)

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK301004

3

1

2

4

AC

Connector: A-13X

A-13X

Harness side
connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-344

STEP 13. Connector check: C-110 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector

Q: Is the check result normal?

YES :

Go to Step 14 .

NO :

Repair or replace.

STEP 14. Fan motor drive test.

• Disconnect C-110 engine-ECU <M/T> connector

or engine-A/T-ECU <A/T> connector.

• Ignition switch: ON

OK: Fan motor rotates.

Q: Is the check result normal?

YES :

Go to Step 15 .

NO :

Go to Step 16 .

STEP 15. MUT-III actuator test

• Refer to Actuator Test Reference Table

P.13A-371

a. Item 21: Fan controller

OK: Fan motor rotates.

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

NO :

Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

AK305618AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector

AK305618AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-345

STEP 16. Perform voltage measurement at C-110
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.

• Disconnect connector, and measure at harness

side.

• Ignition switch: ON

• Voltage between terminal No. 17 and earth.

OK: 4.9

− 5.1 V

Q: Is the check result normal?

YES :

Go to Step 17 .

NO :

Go to Step 19 .

STEP 17. Check harness between A-13X
(terminal No. 4) fan control relay connector and
battery.

• Check power supply line for damage.

Q: Is the check result normal?

YES :

Go to Step 18 .

NO :

Repair.

STEP 18. Check harness between A-13X
(terminal No. 2) fan control relay connector and
A-26 (terminal No. 3) fan controller connector.

• Check power supply line for damage.

Q: Is the check result normal?

YES :

Replace fan motor and fan controller.

NO :

Repair.

AK305618AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector

AK301004

3

1

2

4

AC

Connector: A-13X

A-13X

Harness side
connector

AK301004

3

1

2

4

AC

Connector: A-13X

A-13X

Harness side
connector

AK300999

1

2

3

AC

Harness side connector

Connector: A-26

A-26 (GR)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-346

STEP 19. Check harness between A-26 (terminal
No. 2) fan controller connector and C-110
(terminal No. 17) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

NOTE: Before checking harness, check intermediate
connector A-16, and repair if necessary.

• Check earthing line for short circuit.

Q: Is the check result normal?

YES :

Replace fan motor and fan controller.

NO :

Repair.

AK300999

1

2

3

AC

Harness side connector

Connector: A-26

A-26 (GR)

AK305618AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector