Mitsubishi Galant 9G. Manual - part 277

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-184

STEP 5. Check the outside/inside air selection damper 
control motor.

CAUTION

Cut off the battery voltage when the damper is in the 
inside/outside air position.
Check the outside/inside air selection damper control motor by 
the following procedures.

Q: Does outside/inside air selection damper control motor 

work normally?
YES : Go to Step 6.
NO :  Replace the outside/inside air selection damper 

control motor. Check that the outside/inside air 
selection damper control motor works normally. 

STEP 6. Check A/C-ECU connector C-15 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is A/C-ECU connector C-15 in good condition?

YES : Go to Step 7.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the outside/inside air selection damper control 
motor works normally.

LEVER POSITION BATTERY 

CONNECTION

LEVER 
OPERATION

At the outside 
position

• Connect 

terminal 1 to the 
positive battery 
terminal

• Connect 

terminal 5 to the 
negative battery 
terminal

The lever moves 
from the outside 
position to the 
inside position

At the inside 
position

• Connect 

terminal 1 to the 
positive battery 
terminal

• Connect 

terminal 4 to the 
negative battery 
terminal

The lever moves 
from the inside 
position to the 
outside position

AC206298

OUTSIDE POSITION

INSIDE POSITION

AB

3

1 2

4 5

AC305233

CONNECTOR: C-15

BG

C-105 (B)

HARNESS SIDE

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-185

STEP 7. Check the wiring harness between outside/inside 
air selection damper control motor connector C-106 
(terminals 4 and 5) and A/C-ECU C-15 (terminals 5 and 6).
Q: Are the wiring harness between outside/inside air 

selection damper control motor connector C-106 
(terminals 4 and 5) and A/C-ECU C-15 (terminals 5 and 
6) in good condition?
YES : Go to Step 8.
NO :  Repair the wiring harness. Check that the 

outside/inside air selection damper control motor 
works normally.

STEP 8. Retest the system.
Q: Does a malfunction take place again?

YES : Replace the A/C-ECU, and check that the 

outside/inside air selection damper control motor 
works normally.

NO :  It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-14

.

AC305234

HARNESS SIDE

C-15

AN

CONNECTORS: C-15, C-106

C-106

HARNESS SIDE

C-106

C-15 (B)

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

55A-186

INSPECTION PROCEDURE 4: When the A/C is Operating, Temperature Inside the Passenger 
Compartment does not Decrease (Cool Air is not Emitted).

A/C 
COMPRESSOR 
CLUTCH RELAY

IGNITION 
SWITCH (IG2)

BATTERY

RELAY 
BOX

A/C 
REFRIGERANT
TEMPERATURE
SWITCH

A/C 
COMPRESSOR 
ASSEMBLY

A/C 
COMPRESSOR 
CLUTCH

A/C-ECU

POWERTRAIN
CONTROL
MODULE

JOINT
CONNECTOR
(1)

JUNCTION
BLOCK

A/C Compressor Circuit

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

55A-187

AC305210

CONNECTOR: A-13

AS

A-13 (GR)

AC305977AK

CONNECTOR: B-18X

AC305216

CONNECTOR: B-21 <2.4L>

AB

B-21 (B)

AC305214

B-28 (B)

AC

CONNECTOR: B-28 <2.4L>

AC305229AC

B-21 (B)

CONNECTOR: B-21 <3.8 L>

AC305218

B-28 (B)

AC

CONNECTOR: B-28 <3.8 L>

AC305231

CONNECTOR: C-01

AY

AC305233

CONNECTORS: C-15, C-23

C-15 (B)

C-23

BU