Mitsubishi Colt Ralliart. Manual - part 666

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-25

ACTUATOR TEST TABLE

M1554005200263

Item No.

Check items

Drive content

01

Blower motor: OFF

Stop

02

Blower motor: 8 speed

Middle speed

03

Blower motor: 16 speed

High speed

10

Air mixing damper control motor

Opening angle: Approximately 0% (MAX 
COOL)

11

Opening angle: Approximately 50%

12

Open angle: Approximately 100% (MAX 
COOL)

30

Outside/Inside air selection damper control 
motor

Moved to recirculation-side

31

Moved to outside air-side

40

Rear defogger switch

OFF

41

ON

09*

Condenser fan

Stop

0B*

OPERATION

50*

Idle-up requirement

OFF

51*

Low-load

52*

High-load

NOTE: *: Drive at the engine operation

37

Outside/Inside air selection 
switch

Ignition switch: ON

Display the outside/inside air 
selection switch status

40

Abnormal low pressure 
judgement

Ignition switch: ON

Displays the abnormal low 
pressure judgement

41

Refrigerant leaks judgement Ignition switch: ON

Display the refrigerant leaks 
judgement

42

DEF position flag

Ignition switch: ON

Display the DEF position flag

43

Forcible DEF position flag

Ignition switch: ON

Display the forcible DEF 
position flag

44

Forcible DEF DRY flag

Ignition switch: ON

Display the forcible DEF DRY 
flag

45

MAX COOL DRY flag

Ignition switch: ON

MAX COOL DRY flag status

46

MAX COOL recirculation 
flag

Ignition switch: ON

Display the MAX COOL inside 
air flag

47

MAX HOT A/C OFF flag

Ignition switch: ON

Display the MAX HOT A/C 
OFF flag

48

MAX HOT fresh flag

Ignition switch: ON

Display the AX HOT outside 
air flag

Item No.

Check items

Check contents

Main

Index

Group

TOC

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-26

CHECK AT THE COMBINATION METER 
(METER AND A/C-ECU) TERMINALS

M1552010300851

AC206265

AE

35

34

252627

32

31

24

2223

33

29

21

30

36

28

52

49 50 51

44

43

45 46

48

47

41 42

20

19

18

17

7

6

15

14

4

3

1112 13

5

1

9 10

2

16

8

B-16

B-15

B-14

Terminal No.

Check items

Check conditions

Normal conditions

5

Air mixing damper 
control motor and 
potentiometer input

MAX HOT position 

Approximately 4 V

MAX COOL position 

Approximately 1 V

6

Photo sensor power 
supply

Brightness 0 lux

4.9 

− 5.1 V

Brightness 100000 lux or more

0 V

7

Interior temperature 
sensor

Sensor probe temperature 25

°C 

(4k

Ω)

2.1 

− 2.7 V

8

A/C pressure sensor 
input

Refer to 

P.55A-51

Refer to 

P.55A-51

9

Air thermo sensor

Sensor probe temperature 25

°C 

(1.5k 

Ω)

2.2 V

10

Ambient 
temperature sensor

Sensor probe temperature 25

°C 

(1.5k 

Ω)

2.2 V

11

Air mixing damper 
control motor (MAX 
HOT)

When the damper flaps is moving to 
the MAX COOL position.

0 V

When the damper flaps is moving to 
the MAX HOT position.

System voltage

12

Blower relay input

IG2: ON

System voltage

13

Rear defogger relay IG2: ON

System voltage

14

Photo sensor earth

Always

0 V

15

Sensor earth

Always

0 V

Main

Index

Group

TOC

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-27

16

Outside/Inside air 
selection damper 
control motor

When the damper is moved to the 
inside air recirculation position

0 V

When the damper is moved to the 
fresh air position

System voltage

17

Outside/Inside air 
selection damper 
control motor

When the damper is moved to the 
inside air recirculation position

System voltage

When the damper is moved to the 
fresh air position

0 V

18

Air mixing damper 
control motor (MAX 
COOL)

When the damper flaps is moving to 
the MAX HOT position.

0 V

When the damper flaps is moving to 
the MAX COOL position.

System voltage

19

Power transistor

Maximum air volume

1 V

20

Power transistor

Maximum air volume

7.5 V

29

Heater control power 
supply

IG2: ON

System voltage

31

Ignition switch (IG1) 
power supply 

IG1: ON

System voltage

32

Ignition switch (IG2) 
power supply

IG2: ON

System voltage

33

Ignition switch (IG2) 
power supply

Always

System voltage

34

A/C pressure sensor 
earth

Always

0 V

35

Heater control earth Always

0 V

36

earth

Always

0 V

Terminal No.

Check items

Check conditions

Normal conditions

Main

Index

Group

TOC

ON-VEHICLE SERVICE

AUTOMATIC AIR CONDITIONER

55B-28

ON-VEHICLE SERVICE

IDLE-UP OPERATION CHECK

M1552001600832

1. Before inspection and adjustment, set vehicle in 

the following condition:

• Engine coolant temperature: 80 − 90 °C

• Lamps, electric cooling fan and accessories: Set 

to OFF

• Transmission: Neutral ("N" or "P" for vehicles with 

A/T)

• Steering wheel: Straightforward

2. Check whether or not the idle speed is the 

standard value.
(1) Refer to GROUP 11C, On-vehicle Service 

− 

Idle Speed Check 

P.11C-12

.

Standard value: 750 

± 50 r/min

3. When the A/C is running after turning the A/C 

switch to ON, and the blower switch to the 3(MH) 
or 4(HI) position, check to be sure that the idle 
speed is at the standard value.

Standard value: 850 

± 100 r/min

NOTE: It is not necessary to make an adjustment, 
because the idling speed is automatically 
adjusted by the ISC system. If, however, a devia-
tion from the standard value occurs for some rea-
son, check the ISC system.

Main

Index

Group

TOC