Mitsubishi Outlander (2003+). Manual — part 538

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-47

INSPECTION PROCEDURE 9: Malfunction of the A/C-ECU Power Supply System.

COMMENTS ON TROUBLE SYMPTOM
The A/C-ECU power system may be defective if the
air conditioner, defogger, and outside/inside air
selection damper motor all do not operate normally.

TROUBLESHOOTING HINTS

•

Damaged the wiring harness or connectors

•

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

DIAGNOSIS

STEP 1. Measure the voltage at A/C-ECU
connector C-06.

(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 10 and

body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 2.

IGNITION
SWITCH (IG2)

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

A/C-ECU Power Supply Circuit

AC301397

Connector: C-06

AN

9

1

15

7

4

12 1110

2

3

13

5

14

6

16

8

C-06(B)

Harness side

AC301541CH

Connector C-06
(Harness side)

9

1

15

7

4

121110

2

3

13

5

14

6

16

8

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-48

STEP 2. Connector check: C-06 A/C-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the connector.

STEP 3. Check the wiring harness between C-06
A/C-ECU connector terminal No.10 and the
ignition switch (IG2).

NOTE: Prior to the wiring harness inspection, check
junction block connectors C-203 and C-205, and
repair if necessary.

•

Check the A/C-ECU power supply 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.

AC301397

Connector: C-06

AN

9

1

15

7

4

12 1110

2

3

13

5

14

6

16

8

C-06(B)

Harness side

AC301397

Connector: C-06

AN

9

1

15

7

4

12 1110

2

3

13

5

14

6

16

8

C-06(B)

Harness side

AC210475

Connectors: C-203, C-205

AR

Junction Block (Front View)

C-205

C-203

Harness side

C-203

C-205

4

6 5

3

2

1

21

7

16 15

17

18

20 19

1

2

3

4

5

6

23 22

24

25

28

26

27

9

8

10

11

14

12

13

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-49

STEP 4. Measure the resistance at the C-06
A/C-ECU connector.

(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Measure the resistance between terminal 12 and

body earth.

OK: 2 ohm or less

Q: Is the check result normal?

YES :

Replace the manual air conditioner control

panel (A/C-ECU).

NO :

Go to Step 5.

STEP 5. Connector check: C-06 A/C-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair or replace the connector.

STEP 6. Check the wiring harness between C-06
A/C-ECU connector terminal No.12 and the earth.

•

Check the A/C-ECU earth line for open circuit.

Q: Is the check result normal?

YES :

Replace the manual air conditioner control

panel (A/C-ECU).

NO :

Repair the wiring harness.

AC301397

Connector: C-06

AN

9

1

15

7

4

12 1110

2

3

13

5

14

6

16

8

C-06(B)

Harness side

AC301541CN

Connector C-06
(Harness side)

9

1

15

7

4

121110

2

3

13

5

14

6

16

8

AC301397

Connector: C-06

AN

9

1

15

7

4

12 1110

2

3

13

5

14

6

16

8

C-06(B)

Harness side

AC301397

Connector: C-06

AN

9

1

15

7

4

12 1110

2

3

13

5

14

6

16

8

C-06(B)

Harness side

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-50

CHECK AT ECU TERMINAL

M1552010300464

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16

AC300861AB

<C-06>

Terminal No. Check item

Checking requirement

Normal condition

1

Rear defogger switch

Defogger switch: ON

0 V

Defogger switch: OFF

System voltage

2

Inside/outside air changeover
damper motor (outside air)

When the damper is moved to
the inside air recirculation
position

0 V

When the damper is moved to
the outside air inside air intake
position

System voltage

3

Inside/outside air changeover
damper motor (inside air)

When the damper is moved to
the inside air recirculation
position

System voltage

When the damper is moved to
the outside air inside air intake
position

0 V

4

Output to the engine-A/T-ECU
(A/C1)

A/C stopped

0 V

•

A/C switch: ON

•

Blower switch: ON

System voltage

5

Output to the engine-A/T-ECU
(A/C2)

When the A/C is under low load System voltage
When the A/C is under high
load

0 V

6

Power supply to the A/C
illumination

Lighting switch: ON

System voltage

7

-

-

-

8

Blower switch (lo)

blower switch: lo

System voltage

9

-

-

-

10

Power supply to the ignition
switch (IG2)

Ignition switch: ON

System voltage

11

Earth to the A/C illumination

Always

0 V

12

Earth

Always

0 V

13

Air thermo sensor (outlet side)

Sensor probe temperature 25

°

C

(1.5k ohm)

2.2 V

14

Air thermo sensor (inlet side)

Sensor probe temperature 25

°

C

(1.5k ohm)

2.2 V

15

-

-

-

16

Earth to the air thermo sensor

Always

0 V