Mitsubishi 380. Manual — part 210

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-136

ACTUATOR TEST REFERENCE

M1554005200133

MUT-III DIAGNOSTIC
TOOL DISPLAY

ITEM NO.

INSPECTION ITEM

DRIVE CONTENT

Blower fan: OFF

83

Blower motor

OFF

Blower fan: Middle

84

Middle speed

Blower fan: High

85

High speed

Air mix damper motor:
0%

42

Air mixing damper control motor

Opening degree: approx.
0% (Max cool)

Air mix damper motor:
100%

43

Opening degree: approx.
100% (Max hot)

Air outlet c/o damper:
FACE

70

Mode selection damper control
motor

FACE

Air outlet c/o damper: Bi_
Level

67

FOOT/FACE

Air outlet c/o damper:
FOOT

71

FOOT

Air outlet c/o damper:
DEF/FOOT

69

DEF/FOOT

Air outlet c/o damper:
DEF

68

DEF

Idle up request: high load 74

Idle speed

HIGH idle up

Idle up request: low load 75

LOW idle up

Idle up request: OFF

76

OFF

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%

77

Condenser fan

OFF

Condenser: 50%

79

Middle speed

Rheostat: 0%

80

Rheostat- Illumination control

OFF

Rheostat: 100%

81

Full duty

Rheostat: 50%

82

Half duty

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-137

CHECK AT A/C-ECU TERMINAL

M1552010300572

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 is moved to
the inside air recirculation
position.

0.5 V

When the damper is moved to
the outside air induction
position.

0 V (when the motor is
stopped)

6

Outside/inside air selection
damper control motor (inside)

When the damper is moved to
the inside air recirculation
position.

0 V (when the motor is
stopped)

When the damper is moved to
the outside air induction
position.

0.5 V

8

Rear defogger relay

Ignition switch: ON

Battery positive voltage

9

Front 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

12

A/C pressure sensor

Ignition switch: ON

5 V

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-138

16

Potentiometer power supply

Ignition switch: ON

5 V

17

Power transistor (BASE)

When the blower speed
selection dial shows Maximum
air volume.

1 V

18

Power transistor
(COLLECTOR)

When the blower speed
selection dial shows Maximum
air volume.

12.1 V

19

Photo sensor

Ignition switch: ON

5 V

20

Sensors and potentiometers
ground

Always

0 V

21

Mode selection damper control
motor potentiometer input

When the damper is moved to
the FACE position.

4 V

22

Interior temperature sensor

Ignition switch: ON

5 V

23

Ambient temperature sensor
input

When sensor temperature is
25

°C (77°F) [4 kΩ]

1.9 V

24

Air thermo sensor input

When sensor temperature is
25

°C (77°F) [1.5 kΩ]

2.2 V

25

Photo sensor ground

Ignition switch: ON

0 V

26

A/C pressure sensor

at 2.6 MPa

3.9 V

27

Ground

Always

0 V

28

Power supply to the ignition
switch (IG2)

Ignition switch: ON

Battery positive voltage

29

Air mixing damper control motor
potentiometer input

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

1.4 V

30

Illumination ground

Always

0 V

31

ILL power supply

Lighting switch: ON

Battery positive voltage

34

A/C pressure sensor ground

Always

0 V

36

Power supply to the ignition
switch (ACC)

Ignition switch: ON

Battery positive voltage

TERMINAL
NO.

CHECK ITEM

CHECKING REQUIREMENTS

NORMAL CONDITION

SPECIAL TOOLS

HEATER, AIR CONDITIONING AND VENTILATION

55-139

SPECIAL TOOLS

M1552000600334

TOOL

TOOL NUMBER
AND NAME

SUPERSESSION

APPLICATION

MB991367
Special spanner

MB991367-01

Armature mounting nut of
compressor removal and
installation

MB991386 Pin

MIT217213

Armature mounting nut of
compressor removal and
installation

MB991658
Test harness set

Tool not available

Inspection of throttle position
sensor

B991367

MB991658