Mitsubishi Outlander (2003+). Manual - part 550

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-15

Step 3. Check the wiring harness between C-27 
A/C-ECU connector (terminals 8 and 20) and 
C-316 air thermo sensor connector (terminals 1 
and 2).

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-36 and heater water 
temperature sensor connector C-314, and repair if 
necessary.

•

Check the sensor signal line and earth line for 
open or short circuit.

Q: Is the check result normal?

YES : 

Replace the automatic air conditioner 

control panel (A/C-ECU)

NO : 

Repair the wiring harness.

AC301398

Connectors: C-27, C-36 <LHD>

C-27(B)

C-27

C-36

BE

C-36

Harness side

8

2

10 9

1

5

3

4

6

7

20191817161514131211

1 2

4

3

12

11

10

9

8

7

6

13

5

AC308736

Connectors: C-27, C-36 <RHD>

C-27(B)

C-27

C-36

AK

C-36

Harness side

8

2

10 9

1

5

3

4

6

7

20191817161514131211

1 2

4

3

12

11

10

9

8

7

6

13

5

AC309436

Connectors: C-314, C-316 <LHD>

Harness side

2

1

C-314

C-316

2

1

C-314

C-316

AB

Harness side

AC308740

Connectors: C-314, C-316 <RHD>

Harness side

C-314

C-316

2

1

C-314

C-316

AB

Harness side

2

1

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-16

Diagnosis code 31: Air mixing damper control motor potentiometer system

COMMENTS ON TROUBLE SYMPTOM
This code is set when the air mixing damper control 
motor potentiometer does not send any signal to the 
A/C-ECU due to short or open circuit.

Possible causes

•

Malfunction of the air mixing damper control 
motor and potentiometer

•

Damaged the wiring harness or connectors

•

Malfunction of the automatic air conditioner 
control panel (A/C-ECU)

DIAGNOSIS

Step 1. Check the air mixing damper control 
motor and potentiometer.

Refer to 

P.55B-102

.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the air mixing damper control 
motor and potentiometer.

MODE SELECTION DAMPER 
CONTROL MOTOR AND 
POTENTIOMETER

AIR MIXING DAMPER 
CONTROL MOTOR AND 
POTENTIOMETER

HEATER WATER 
TEMPERATURE 
SENSOR

A/C-ECU

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   

Air Mixing Damper Control Motor Potentiometer Circuit

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-17

Step 2. Connector check: C-27 A/C-ECU 
connector and C-313 air mixing damper control 
motor and potentiometer connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the connector.

AC301397

Connector: C-27 
<LHD>

AX

C-27(B)

Harness side

8

2

10 9

1

5

3

4

6

7

20191817161514131211

AC308735

Connector: C-27 <RHD>

AY

C-27(B)

Harness side

8

2

10 9

1

5

3

4

6

7

20191817161514131211

AC309435

Connector: C-313 <LHD>

AD

Harness side

2
6 5

1
3

4

AC308739

Connector: C-313 <RHD>

AD

Harness side

2
6 5

1
3

4

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-18

Step 3. Check the wiring harness between C-27 
A/C-ECU connector (terminals 10, 5 and 20) and 
C-313 air mixing damper control motor and 
potentiometer connector (terminals 2, 5 and 6).

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-36, mode selection 
damper control motor and potentiometer connector 
C-315 and heater water temperature sensor 
connector C-314, and repair if necessary.

•

Check the potentiometer power supply, earth and 
signal line for open or short circuit.

Q: Is the check result normal?

AC301398

Connectors: C-27, C-36 <LHD>

C-27(B)

C-27

C-36

BE

C-36

Harness side

8

2

10 9

1

5

3

4

6

7

20191817161514131211

1 2

4

3

12

11

10

9

8

7

6

13

5

AC308736

Connectors: C-27, C-36 <RHD>

C-27(B)

C-27

C-36

AK

C-36

Harness side

8

2

10 9

1

5

3

4

6

7

20191817161514131211

1 2

4

3

12

11

10

9

8

7

6

13

5

AC309436

Connectors: C-313, C-314, C-315 <LHD>

Harness side

C-314

C-315

2

1

C-314

C-313

AC

C-315

C-313

2
6 5

1
3

4

2
6 5

1
3

4

Harness side

Harness side

AC308740

Connectors: C-313, C-314, C-315 <RHD>

Harness side

C-314

C-315

2

1

C-314

C-313

AC

C-315

C-313

2
6 5

1
3

4

2
6 5

1
3

4

Harness side

Harness side