Mitsubishi Galant 9G. Manual — part 295

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-256

12

A/C pressure sensor

Ignition switch: ON

5 V

13

− 15

−

−

−

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.

7.5 V

19

−

−

−

20

Sensors and potentiometers
ground

Always

0 V

21

Mode selection damper control
motor potentiometer input

When the damper has moved to
the DEF position.

0.7

− 1.3 V

22

−

−

−

23

Ambient air temperature sensor
input

When sensor temperature is
25

°C (77°F) [4 kΩ]

1.9 V

24

−

−

−

25

Air thermo sensor input

When sensor temperature is
25

°C (77°F) [1.5 kΩ]

2.2 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 has
moved to the MAX. HOT
position.

0.7

− 1.3 V

30

Illumination ground

Always

0 V

31

ILL power supply

Lighting switch: ON

Battery positive voltage

32, 33

−

−

−

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

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HEATER, AIR CONDITIONING AND VENTILATION

55A-257

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

SPECIAL TOOLS

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HEATER, AIR CONDITIONING AND VENTILATION

55A-258

MB991958

A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991914
F: MB991825
G: MB991826

MUT-III Sub
Assembly

A: Vehicle

communicatio
n interface
(V.C.I.)

B: MUT-III USB

cable

C: MUT-III main

harness A
(Vehicles with
CAN
communicatio
n system)

D: MUT-III main

harness B
(Vehicles
without CAN
communicatio
n system)

E: MUT-III main

harness C (for
Daimler
Chrysler
models only)

F: MUT-III

measurement
adapter

G: MUT-III

Trigger
Harness

MB991824-KIT
NOTE: . G:
MB991826 MUT-III
Trigger Harness is not
necessary when
pushing V.C.I.
ENTER key.

Checking diagnostic trouble codes

CAUTION

For vehicles with CAN
communication, use MUT-III
main harness A to send
simulated vehicle speed. If you
connect MUT-III main harness B
instead, the CAN
communication does not
function correctly.

TOOL

TOOL NUMBER
AND NAME

SUPERSESSION

APPLICATION

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

A

B

C

D

E

F

G

DO NOT USE

ON-VEHICLE SERVICE

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HEATER, AIR CONDITIONING AND VENTILATION

55A-259

ON-VEHICLE SERVICE

REFRIGERANT LEVEL TEST

M1552008400408

Use the refrigerant recovery station to remove all of the refrig-
erant, and then calculate the amount of the refrigerant and
charge it.

A/C COMPRESSOR CLUTCH TEST

M1552019900032

1. Disconnect the air conditioning compressor clutch connector

to the air conditioning compressor clutch.

2. Connect positive battery voltage directly to the connector for

the air conditioning compressor clutch.

3. If the air conditioning compressor clutch is normal, there will

be a "click." If the pulley and armature do not make contact
("no click"), there is a malfunction.

SIMPLE INSPECTION OF THE A/C PRESSURE
SENSOR

M1552014700118

1. Assemble a gauge manifold on the high pressure service

valve.

2. Disconnect the A/C pressure sensor connector and connect

special tool test harness MB991658 as shown in the illustra-
tion.

3. Turn ON the engine and then turn ON the air conditioner

switch.

AC206292AB

A/C COMPRESSOR
CLUTCH
CONNECTOR

AC305034

A/C PRESSURE SENSOR

AD

AC307368

A/C
PRESSURE
SENSOR
SIDE

MB991658

AB

HARNESS SIDE