Mitsubishi Montero (2004+). Manual — part 642

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-57

STEP 8. Check photo sensor connector D-09 and A/C-ECU
connector D-24 for damage.

Q: Is photo sensor connector D-09 and A/C-ECU connector

D-24 in good condition?
YES : Go to Step 9.
NO : Repair or replace the connector. Refer to GROUP

00E, Harness Connector Inspection

P.00E-2

. The

temperature control should work normally.

STEP 9. Check the wiring harness between photo sensor
connector D-09 (terminal 1 and 2) and A/C-ECU D-24
(terminals 31 and 29).

Q: Is the wiring harness between photo sensor connector

D-09 (terminal 1 and 2) and A/C-ECU D-24 (terminals 31
and 29) in good condition?
YES : Replace the photo sensor. The temperature control

should work normally.

NO : Repair the wiring harness. The temperature control

should work normally.

AC204188

CONNECTORS : D-09, D-24

D-24(B)

HARNESS SIDE

D-09

HARNESS SIDE

CG

D-24(B)

D-09

22

23

30

31

25

26

33

34

32

24

28

3635

27

29

21

1

2

AC204188

CONNECTORS : D-09, D-24

D-24(B)

HARNESS SIDE

D-09

HARNESS SIDE

CG

D-24(B)

D-09

22

23

30

31

25

26

33

34

32

24

28

3635

27

29

21

1

2

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-58

STEP 10. Using scan tool MB991958 check actuator test
item 05, item 06 and item 07: air mixing damper control
motor

Item 05, 06 and 07: air mixing damper control motor.
Q: Is the opening angle 100% (05 activated), 50% (06

activated) or 0% (07 activated)?
YES : Go to Step 14.
NO : Go to Step 11.

STEP 11. Check the air mixing damper control motor.

CAUTION

Do not apply battery voltage when the damper is in the
MAX COOL or MAX HOT position.
Check the air mixing damper control motor by the following pro-
cedures.

Q: Does air mixing damper control motor work normally?

YES : Go to Step 12.
NO : Replace the air mixing damper control motor and

potentiometer. The temperature control should work
normally.

LEVER POSITION BATTERY

CONNECTION

LEVER
OPERATION

At the MAX COOL
position

• Connect

terminal 1 to the
positive battery
terminal

• Connect

terminal 2 to the
negative battery
terminal

The lever moves
from the MAX
COOL position to
the outside position

At the MAX HOT
position

• Connect

terminal 2 to the
positive battery
terminal

• Connect

terminal 1 to the
negative battery
terminal

The lever moves
from the MAX HOT
position to the
inside position

ACX01456

MAX HOT
POSITION

MAX COOL
POSITION

AB

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-59

STEP 12. Check air mixing damper control motor and
potentiometer connector D-20 and A/C-ECU connector
D-23 for damage.

Q: Is air mixing damper control motor and potentiometer

connector D-20 and A/C-ECU connector D-23 in good
condition?
YES : Go to Step 13.
NO : Repair or replace the connector. Refer to GROUP

00E, Harness Connector Inspection

P.00E-2

. The

temperature control should work normally.

STEP 13. Check the wiring harness between air mixing
damper control motor and potentiometer connector D-20
(terminals 2 and 1) and A/C-ECU connector D-23 (terminals
1 and 11).

Q: Is the wiring harness between air mixing damper control

motor and potentiometer connector D-20 (terminals 2
and 1) and A/C-ECU connector D-23 (terminals 1 and 11)
in good condition?
YES : Go to Step 14.
NO : Repair the wiring harness. The temperature control

should work normally.

AC204188

CONNECTOR : D-20, D-23

CK

7 6 5 4 3 2 1

HARNESS SIDE

D-20

D-20

D-23(B)

D-23(B)

HARNESS SIDE

1

3

4

2

12

1413

11

6

7

8

10 9

18

19

20

16

17

5

15

AC204188

CONNECTOR : D-20, D-23

CK

7 6 5 4 3 2 1

HARNESS SIDE

D-20

D-20

D-23(B)

D-23(B)

HARNESS SIDE

1

3

4

2

12

1413

11

6

7

8

10 9

18

19

20

16

17

5

15

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-60

STEP 14. Check the flexible flat cable (FFC).

(1) The FCC is connected to the automatic air conditioning

control panel assembly. Check that the FCC connection is
contaminated with foreign material or loose (Refer to

P.55B-142

).

(2) There should be continuity across the FFC terminals.
Q: Is the FFC normal?

YES : Go to Step 15.
NO : Repair the FFC (Refer to

P.55B-142

). The

temperature control should work normally.

AC205264AB