Mitsubishi Galant 9G. Manual — part 294

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-252

ACTUATOR TEST REFERENCE

M1554005200133

MUT-III SCAN TOOL
DISPLAY

ITEM NO.

INSPECTION ITEM

DRIVE CONTENT

Blower fan: OFF

01

Blower motor

OFF

Blower fan: 8 step

02

Middle speed

Blower fan: 16 step

03

High speed

Air mix damper motor:
0%

10

Air mixing damper control motor

Opening degree: approx.
0% (Max cool)

Air mix damper motor:
50%

11

Opening degree: approx.
50%

Air mix damper motor:
100%

12

Opening degree: approx.
100% (Max hot)

Air outlet c/o damper:
FACE

13

Mode selection damper control
motor

FACE

Air outlet c/o damper: Bi_
Level

14

FOOT/FACE

Air outlet c/o damper:
FOOT

15

FOOT

Air outlet c/o damper:
DEF/FOOT

16

DEF/FOOT

Air outlet c/o damper:
DEF

17

DEF

In/out changeover
damper: Recirc

30

Outside/inside air selection damper
control motor

Inside

In/out changeover
damper: Fresh

31

Outside

Rear defogger switch:
OFF

40

Rear window defogger switch

Rear window defogger: OFF

Rear defogger switch:
ON

41

Rear window defogger: ON

Idle up request: OFF

50

Idle up operation

Idle up: OFF

Idle up request: low load 51

Idle up: low load

Idle up request: high load 52

Idle up: high load

Condenser: 0%

09

Condenser fan

OFF

Condenser: 50%

0A

Middle speed

Condenser: 100%

0B

High speed

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-253

CHECK AT A/C-ECU TERMINAL <LOW TYPE>

M1552010300561

24

30

21

272829

2223

32

31

2526

AC306430

C-10

C-09

AB

TERMINAL
NO.

CHECK ITEM

CHECKING REQUIREMENTS NORMAL CONDITION

1

A/C pressure sensor ground

Always

0 V

2

Ground

Always

0 V

3

A/C pressure sensor

Ignition switch: ON

5 V

4

A/C pressure sensor

at 2.6 MPa

3.9 V

5, 6

−

−

−

7

Power supply to the ignition
switch (ACC)

Ignition switch: ON

Battery positive voltage

8

Back-up power supply

Always

Battery positive voltage

9

Air mixing damper control motor When the air mix damper is

moved to the MAX. COOL
position.

10 V

When the air mix damper is
moved to the MAX. HOT
position.

0.5 V

10

Sensors and potentiometers
ground

Always

0 V

11

Mode selection damper control
motor potentiometer input

When the damper has moved to
the DEF position.

0.67 V

12

Air mixing damper control motor
potentiometer input

When the damper door has
moved to the MAX. HOT
position.

1.4 V

13

Air thermo sensor input

When sensor temperature is
25

°C (77°F) [1.5 kΩ]

2.2 V

14

Ambient air temperature sensor
input

When sensor temperature is
25

°C (77°F) [4 kΩ]

1.9 V

15

Potentiometer power supply

Ignition switch: ON

5 V

16

Power supply to the ignition
switch (IG2)

Ignition switch: ON

Battery positive voltage

21

ILL power supply

Lighting switch: ON

Battery positive voltage

22

Illumination ground

Always

0 V

23

A/C compressor relay

A/C compressor relay: ON

Battery positive voltage

24

Blower switch

Ignition switch: ON
Blower switch: ON

Battery positive voltage

25, 26

−

−

−

27

Rear window defogger relay

Ignition switch: ON

Battery positive voltage

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-254

28

Outside/inside air selection
damper control motor (outside)

When the damper flap is
moving to the air recirculation
position.

0.5 V

When the damper flap is
moving to the outside air
position.

0 V (when the motor is
stopped)

29

Outside/inside air selection
damper control motor (inside)

When the damper flap is
moving to the air recirculation
position.

0 V (when the motor is
stopped)

When the damper flap is
moving to the outside air
position.

0.5 V

30

Mode selection damper control
motor (DEF)

When the damper is moved to
the FACE position.

0.5 V

When the damper is moved to
the DEF position.

10 V

31

Mode selection damper control
motor (FACE)

When the damper is moved to
the FACE position.

10 V

When the damper is moved to
the DEF position.

0.5 V

32

Air mixing damper control motor When the air mix damper is

moved to the MAX. COOL
position.

0.5 V

When the air mix damper is
moved to the MAX. HOT
position.

10 V

TERMINAL
NO.

CHECK ITEM

CHECKING REQUIREMENTS NORMAL CONDITION

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-255

CHECK AT A/C-ECU TERMINAL <MIDDLE TYPE>

M1552010300583

8

2

1

5

3 4

6 7

9 10

20

19

18

17

16

15

14

13

12

11

32

24

29

21

31

30

2223

27

35

33

25

34

26

36

28

AC210339

C-15

C-16

AB

TERMINAL
NO.

CHECK ITEM

CHECKING REQUIREMENTS NORMAL CONDITION

1

Air mixing damper control motor When the air mix damper is

moved to the MAX. COOL
position.

10 V

When the air mix damper is
moved to the MAX. HOT
position.

0.5 V

2

Air mixing damper control motor When the air mix damper is

moved to the MAX. COOL
position.

0.5 V

When the air mix damper is
moved to the MAX. HOT
position.

10 V

3

Back-up power supply

Always

Battery positive voltage

4

Mode selection damper control
motor (DEF)

When the damper is moved to
the FACE position.

0.5 V

When the damper is moved to
the DEF position.

10 V

5

Outside/inside air selection
damper control motor (outside)

When the damper flap is
moving to the air recirculation
position.

0.5 V

When the damper flap is
moving to the outside air
position.

0 V (when the motor is
stopped)

6

Outside/inside air selection
damper control motor (inside)

When the damper flap is
moving to the air recirculation
position.

0 V (when the motor is
stopped)

When the damper flap is
moving to the outside air
position.

0.5 V

7

−

−

−

8

Rear window defogger relay

Ignition switch: ON

Battery positive voltage

9

Blower relay

Ignition switch: ON

Battery positive voltage

10

A/C compressor relay

A/C compressor relay: ON

Battery positive voltage

11

Mode selection damper control
motor (FACE)

When the damper is moved to
the FACE position.

10 V

When the damper is moved to
the DEF position.

0.5 V