Mitsubishi Outlander (2003+). Manual - part 549

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-11

Step 2. Connector check: C-27 A/C-ECU 
connector and C-314 heater water temperature 
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-314 <LHD>

AB

Harness side

2

1

AC308739

Connector: C-314 <RHD>

AB

Harness side

2

1

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-12

Step 3. Check the wiring harness between C-27 
A/C-ECU connector (terminals 4 and 20) and 
C-314 heater water temperature sensor 
connector (terminals 2 and 1).

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-36, 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

AC309435

Connector: C-314 <LHD>

AB

Harness side

2

1

AC308739

Connector: C-314 <RHD>

AB

Harness side

2

1

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-13

Diagnosis code 21, 22: Air thermo sensor system

COMMENTS ON TROUBLE SYMPTOM
This code is set when the air thermo sensor circuit is 
open (Code No.21) or is short (Code No.22).

Possible causes

•

Malfunction of the air thermo sensor

•

Damaged the wiring harness or connectors

•

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

DIAGNOSIS

Step 1. Check the air thermo sensor.

Refer to 

P.55B-105

.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the air thermo sensor.

HEATER WATER 
TEMPERATURE 
SENSOR

AIR THERMO 
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 Thermo Sensor Circuit

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-14

Step 2. Connector check: C-27 A/C-ECU 
connector and C-316 air thermo sensor 
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-316 <LHD>

AC

Harness side

2

1

AC308739

Connector: C-316 <RHD>

AC

Harness side

2

1