Mitsubishi Outlander (2003+). Manual - part 101

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-267

Inspection Procedure 28: A/C Load Signal System

OPERATION

œ

The A/C load signal is inputted to the engine-
ECU (terminal No. 24) from the A/C-ECU (termi-
nal No. 5). <Manual A/C> or (terminal No. 32) 
<Auto A/C>

FUNCTION

œ

The magnitude of the A/C compressor load is 
detected and input to the engine-ECU. The 
engine-ECU provides A/C idle up control accord-
ing to the A/C compressor load condition.

PROBABLE CAUSE

œ

Failed A/C-ECU

œ

Open/short circuit in A/C load signal circuit or 
loose connector contact

œ

Failed engine-ECU

AK300338

1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13

12

23 24 25 26

21

3

10 11

5 <Manual A/C>

32 <Auto A/C>

24

6

C-106

Engine-ECU

A/C-ECU

A/C load signal circuit

AB

L-W

L-W

C-134

C-06

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Gray
R: Red  P: Pink  V:Violet

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-268

DIAGNOSIS PROCEDURE

STEP 1. Measure voltage at C-134 engine-ECU 
connector.

œ

Measure engine-ECU terminal voltage.

œ

Engine: Idling

œ

A/C switch: ON (A/C compressor in driven state)

œ

Voltage between terminal No. 24 and earth

OK:

1 V or less (when the temperate around the 

atmospheric air temperature sensor is 18

•

C 

or more, and the A/C is set to the lowest tem-
perature and the maximum air flow rate)

System voltage (when the A/C is set to the 

temperature in the cabin and the minimum 
air flow rate)

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Go to Step 4 .

STEP 2. Connector check: C-134 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair.

STEP 3. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES : 

Replace engine-ECU.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

-

 How to Use 

Troubleshooting/Inspection Service Points 

3

00



).

STEP 4. Connector check: C-134 engine-ECU 
connector 

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Repair.

AK300257

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13 12

23

24

25

26

21

3

10

11

AB

CONNECTOR: C-134

C-134

Harness side connector

AK300257

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13 12

23

24

25

26

21

3

10

11

AB

CONNECTOR: C-134

C-134

Harness side connector

AK300257

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13 12

23

24

25

26

21

3

10

11

AB

CONNECTOR: C-134

C-134

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-269

STEP 5. Measure voltage at C-06 A/C-ECU 
connector <Manual A/C> or C-26 A/C-ECU 
connector <Auto A/C>.

œ

Measure A/C-ECU terminal voltage.

œ

Engine: Idling

œ

A/C set temperature:
Maximum Cool when temperature in cabin is 

25

•

C or more

Maximum Hot when temperature in cabin is 25

•

C 

or less

œ

Voltage between terminal No. 5 and earth <Man-
ual A/C>

œ

Voltage between terminal No. 32 and earth <Auto 
A/C>

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Go to Step 6 .

STEP 6. Connector Check: C-06 A/C-ECU 
connector <Manual A/C> or C-26 A/C-ECU 
connector <Auto A/C>

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Repair.

AK300326

8

16

7

15

6

14

5

13

4

12

3

11

2

10

1
9

Harness side
connector

C-06 (B)

AB

Connector: C-06
<Manual A/C>

AK300327

28
36

27
35

26
34

25
33

24
32

23
31

22
30

21
29

Harness side
connector

C-26 (B)

AB

Connector: C-26
<Auto A/C>

AK300326

8

16

7

15

6

14

5

13

4

12

3

11

2

10

1
9

Harness side
connector

C-06 (B)

AB

Connector: C-06
<Manual A/C>

AK300327

28
36

27
35

26
34

25
33

24
32

23
31

22
30

21
29

Harness side
connector

C-26 (B)

AB

Connector: C-26
<Auto A/C>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-270

STEP 7. Check harness between C-06 (terminal 
No. 5) or C-26 (terminal No. 32) A/C-ECU 
connector and C-134 (terminal No. 24) engine-
ECU connector.

NOTE: Before checking harness, check intermediate 
connector C-104, and repair if necessary.

œ

Check output line for short circuit.

Q: Is the check result normal?

YES : 

Check A/C system (Refer to GROUP 55A 

-

 

Troubleshooting 

3

55A



).

NO : 

Repair.

STEP 8. Check connector: C-06 A/C-ECU 
connector <Manual A/C> or C-26 A/C-ECU 
connector <Auto A/C>

Q: Is the check result normal?

YES : 

Check intermediate connector C-104, and 

repair if necessary. If intermediate 
connector is normal, check and repair 
harness between C-06 (terminal No. 5) or 
C-26 (terminal No. 32) A/C-ECU connector 
and C-134 (terminal No. 24) engine-ECU 
connector.

œ

Check output line for open circuit.

NO : 

Repair.

AK300326

8

16

7

15

6

14

5

13

4

12

3

11

2

10

1
9

Harness side
connector

C-06 (B)

AB

Connector: C-06
<Manual A/C>

AK300327

28
36

27
35

26
34

25
33

24
32

23
31

22
30

21
29

Harness side
connector

C-26 (B)

AB

Connector: C-26
<Auto A/C>

AK300257

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13 12

23

24

25

26

21

3

10

11

AB

CONNECTOR: C-134

C-134

Harness side connector

AK300326

8

16

7

15

6

14

5

13

4

12

3

11

2

10

1
9

Harness side
connector

C-06 (B)

AB

Connector: C-06
<Manual A/C>

AK300327

28
36

27
35

26
34

25
33

24
32

23
31

22
30

21
29

Harness side
connector

C-26 (B)

AB

Connector: C-26
<Auto A/C>

AK300257

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13 12

23

24

25

26

21

3

10

11

AB

CONNECTOR: C-134

C-134

Harness side connector