Mitsubishi Lancer (4A9 engine). Manual - part 313

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-6

45

In/out select damper 
poten (target)

−

Displays outside/inside air 
selection damper target 
position.

46

In/out select damp 
potentiometer

−

Displays outside/inside air 
selection damper position.

55

Air outlet c/o 
potentiometer

−

Displays air outlet 
changeover damper 
position.

56

Air outlet c/o potentio. 
(Target)

−

Displays air outlet 
changeover damper target 
position.

57

Low pressure

−

Normal

60

Rear defogger switch

Rear window defogger switch ON

ON

Rear window defogger switch OFF

OFF

61

Pressure sensor

−

Displays refrigerant 
pressure.

63

Air mix potentiometer

−

Displays the air mix damper 
position.

68

Front blower fan

−

Displays blower motor 
condition.

69

Front blower fan 
(Target)

−

Displays blower motor target 
value.

73

Refrigerant pressure

−

Displays refrigerant 
pressure status.

74

Condenser fan

−

Displays condenser fan 
running condition.

76

Temp. set dial position

−

Displays the set temperature 
output value on the control 
panel.

77

A/C Panel type

−

Dial/Auto/RHD

78

Fan set dial position

−

Displays the air volume 
output value on the control 
panel.

79

Air outlet c/o set dial 
position

−

Displays output value to the 
air outlet changeover dial on 
the control panel.

80

Fan set dial operation 
flag

−

ON when the air volume 
adjusting dial is operated

81

A/C SW operation flag

−

ON when the air conditioner 
switch is operated

82

Temp. set dial operation 
flag

−

ON when the air conditioner 
switch is operated

83

Defogger flag

−

ON when the air outlet 
changeover dial is set to the 
DEF position.

Item No.

Check item

Inspection status

The display contents 
under normal condition

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-7

ACTUATOR TEST TABLE

M1554005201181

Item No.

Check item

Driven content

2

Idle up request*

Idle-up request signal

5

In/out selection damper

The moving position of outside/inside air selection 
damper motor

6

Air mix damper motor

The moving position of air mix damper motor

7

Front blower fan

The amount of blower motor rotation

8

Air outlet c/o dumper

Air outlet changeover damper motor moving position

10

Cooling fan*

The amount of cooling fan rotation

11

Air conditioner*

A/C switch selection position

12

Rear defogger switch*

Rear window defogger switch selection position

NOTE: *: When the engine is not running these func-
tion do not work.

CHECK AT A/C-ECU TERMINALS

M1552010302653

32

24

29

21

31

30

2223

27

35

33

25

34

26

36

28

AC507400

<C-15>

<C-13>

AG

84

In/out air c/o SW 
operation flag

−

ON when the inside air/
outside air changeover 
switch is operated

87

Rear defogger SW 
operation flag

−

ON when the rear window 
switch is operated

88

Rear defogger SW lamp −

Displays rear window switch 
indicator status.

89

A/C SW lamp

−

Displays air conditioner 
switch indicator status.

90

In/out air c/o SW lamp

−

Displays the status of the 
inside air/outside air 
changeover switch indicator.

91

A/C Compressor drive 
flag

−

ON when the compressor is 
activated.

92

Wiper operation flag

−

ON when the wiper is 
operated.

93

Ignition position 
information

−

Ignition switch position 
status

94

Power source voltage

−

Displays power supply 
voltage.

95

IOD fuse equipment 
flag

−

IOD fuse status

Item No.

Check item

Inspection status

The display contents 
under normal condition

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-8

Terminal 
No.

Check item

Check condition

Normal condition

1

Power transistor (DRAIN)

Air volume control dial: Maximum air 
volume

0 to 2 V

2

Power transistor (GATE)

Air volume control dial: Maximum air 
volume

System voltage

3 

− 8

−

−

−

9

A/C control panel (Signal)

−

−

10 

− 12

−

−

−

13

Battery power supply

 Always

System voltage

14

Earth

 Always

1 V or less

15

IG power supply

Ignition switch: ON

System voltage

16

A/C pressure sensor input

Refer to .

Refer to .

17

Interior temperature sensor

Sensor probe temperature: 25

°C 

(4.0 k

Ω)

2.1 to 2.7 V

18

−

−

−

19

Sensor earth

Always

1 V or less

20

A/C pressure sensor power 
supply

Ignition switch: IG2

5 V

21

Air thermo sensor earth

Always

1 V or less

22

Fin thermo sensor

Sensor probe temperature: 25

°C 

(4.0 k

Ω)

2.1 to 2.7 V

23

−

−

−

24

Motor for air outside/inside 
air circulation switching 
damper

−

−

25

Motor for air outside/inside 
air circulation switching 
damper

−

−

26

Motor for air outside/inside 
air circulation switching 
damper

−

−

27

Motor for air outside/inside 
air circulation switching 
damper

−

−

28

Air mix damper motor

−

−

29

Motor power supply

−

−

30

Air outlet changeover 
damper motor

−

−

31

Air outlet changeover 
damper motor

−

−

32

Air outlet changeover 
damper motor

−

−

33

Air outlet changeover 
damper motor

−

−

INTERIOR TEMPERATURE SENSOR

AUTOMATIC AIR CONDITIONER

55B-9

INTERIOR TEMPERATURE SENSOR

REMOVAL AND INSTALLATION

M1554026400455

WARNING

For removal and installation of the Knee air bag module, always observe the service proce-
dures described in GROUP 52B, Knee air bag module .

AC709810

2

1

AH

A

A

Claw

1

AC704919

Instrument panel

Section A-A

Interior temperature sensor 
removal steps 

•

Knee air bag module (Refer to 
GROUP 52B 

− Knee air bag 

module ).

1.

Aspirator hose

2.

Interior temperature sensor

34

Air mix damper motor

−

−

35

Air mix damper motor

−

−

36

Air mix damper motor

−

−

Terminal 
No.

Check item

Check condition

Normal condition

Interior temperature sensor 
removal steps (Continued)