Mitsubishi Outlander (2003+). Manual - part 556

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-39

STEP 19. Check the wiring harness between 
B-18X A/C compressor relay connector terminal 
No.1 and C-26 A/C-ECU connector terminal 
No.33.

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-104, and repair if 
necessary.

•

Check the A/C compressor relay output line for 
open circuit.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction 

P.00-6

).

NO : 

Repair the wiring harness.

STEP 20. Check the magnetic clutch operation.

 Refer to 

P.55A-51

.

Q: Can the sound of the magnetic clutch (click) be 

heard?

YES : 

Go to Step 21.

NO : 

Replace the compressor magnet clutch. 

STEP 21. Check the refrigerant temperature 
switch.

 Refer to 

P.55A-73

.

Q: Is the refrigerant temperature switch operating 

properly?

YES : 

Go to Step 22.

NO : 

Replace the refrigerant temperature switch.

STEP 22. Check the refrigerant level.

 Refer to 

P.55A-51

.

Q: Is the refrigerant level correct?

YES : 

Go to Step 23.

NO : 

Correct the refrigerant level (Refer to 
On-vehicle Service 

P.55A-52

). 

STEP 23. Check the A/C pressure sensor 
operation.

Refer to 

P.55A-51

.

Q: Is the A/C pressure sensor operating properly?

YES : 

Go to Step 24.

NO : 

Replace the A/C pressure sensor.

AC301483AG

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC301398

Connectors: C-26, C-104

C-104

C-26

AQ

Harness side

15

1
8

3

10

2
9

11

4

13

12

5

14

16

7

6

C-104(B)

C-26(B)

29

21

35

27

24

323130

22

23

33

25

34

26

36

28

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-40

STEP 24. Connector check: A-02 A/C pressure 
sensor connector and C-27 A/C-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 25.

NO : 

Repair the connector.

STEP 25. Check the wiring harness between A-02 
A/C pressure sensor connector terminal No.2 
and C-27 A/C-ECU connector terminal No.11.

NOTE: 

Prior to the wiring harness inspection, check 
intermediate connector C-116, and repair if 
necessary.

•

Check the A/C pressure sensor signal line for 
open circuit.

Q: Is the check result normal?

YES : 

Go to Step 26.

NO : 

Repair the wiring harness.

AC301656

Connector: A-02

AB

Harness side

3 2 1

A-02(B)

AC301397

Connector: C-27

AS

C-27(B)

Harness side

8

2

10 9

1

5

3

4

6

7

20191817161514131211

AC301656

Connector: A-02

AB

Harness side

3 2 1

A-02(B)

AC301397

Connector: C-27

AS

C-27(B)

Harness side

8

2

10 9

1

5

3

4

6

7

20191817161514131211

AC301395AG

9

21

33

35

24

12

3 4

7

8

5 6

39

28

41

30

18

4243

31

1920

32

40

29

1617

38

27

15

37

36

26

14

13

25

2

1

34

23

11

10

22

Connector: C-116

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-41

STEP 26. Connector check: C-134 engine-ECU 
connector and C-26 A/C-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 27.

NO : 

Repair the connector.

STEP 27. Check the wiring harness between 
C-134 engine-ECU connector terminal No.24 and 
C-26 A/C-ECU connector terminal No.32.

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-104, and repair if 
necessary.

•

Check the communication line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 28.

NO : 

Repair the wiring harness.

AC301398

Connectors: C-26, C-134, C-135

C-134

C-135

AR

C-135

Harness side

22

9

14

15

2 1

3

16

1918

5 4

17

6

21

7

20

8

25

12

10

23

11

24

26

13

JAE-E

39

31

45

37

42

34

40

41

32

33

4443

35

36

46

38

JAE-E

C-134

C-26(B)

29

21

35

27

24

323130

22

23

33

25

34

26

36

28

C-26

AC301398

Connectors: C-26, C-104, C-134

C-134

BB

Harness side

22

9

14

15

2 1

3

16

1918

5 4

17

6

21

7

20

8

25

12

10

23

11

24

26

13

JAE-E

C-134

C-26(B)

29

21

35

27

24

323130

22

23

33

25

34

26

36

28

C-26

C-104(B)

15

1
8

3

10

2
9

11

4

13

12

5

14

16

7

6

C-104

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-42

STEP 28. Check the wiring harness between 
C-135 engine-ECU connector terminal No.45 and 
C-26 A/C-ECU connector terminal No.34.

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-104, and repair if 
necessary.

•

Check the communication line for open circuit.

Q: Is the check result normal?

YES : 

Replace the A/C-ECU or engine-ECU.

NO : 

Repair the wiring harness.

AC301398

Connectors: C-26, C-104, C-135

C-135

BC

C-135

Harness side

39

31

45

37

42

34

40

41

32

33

4443

35

36

46

38

JAE-E

C-26(B)

29

21

35

27

24

323130

22

23

33

25

34

26

36

28

C-26

C-104(B)

15

1
8

3

10

2
9

11

4

13

12

5

14

16

7

6

C-104