Mitsubishi Galant 9G. Manual — part 253

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-88

STEP 4. Check A/C-ECU connectors C-15, C-16 and mode
selection damper control motor and potentiometer
connector C-102 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are A/C-ECU connectors C-15, C-16 and mode selection

damper control motor and potentiometer connector
C-102 in good condition?
YES : Go to Step 5.
NO : Repair or replace the connector. Refer to GROUP

00E, Harness Connector Inspection

P.00E-2

. Then go

to Step 7.

AC305234

CONNECTORS: C-15, C-16

C-16 (B)

HARNESS SIDE

C-16

C-15

C-15 (B)

HARNESS SIDE

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

AG

AC305231

C-102

HARNESS SIDE

CD

CONNECTOR: C-102

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-89

STEP 5. Check the wiring harness between A/C-ECU
connectors C-15 (terminals 16 and 20), C-16 (terminal 21)
and mode selection damper control motor and
potentiometer connector C-102 (terminals 5, 7 and 3).

AC305234

CONNECTORS: C-15, C-16

C-16 (B)

HARNESS SIDE

C-16

C-15

C-15 (B)

HARNESS SIDE

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

AG

AC305232

C-03

C-102

CONNECTORS: C-03, C-102

HARNESS SIDE

C-102

C-03

AR

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-90

NOTE: Also check joint connectors C-03 for loose, corroded, or
damaged terminals, or terminals pushed back in the connector.
If joint connector C-03 is damaged, repair or replace the con-
nector as described in GROUP 00E, Harness Connector
Inspection

P.00E-2

.

Q: Are the wiring harnesses between A/C-ECU connector

C-15 (terminals 16 and 20), C-16 (terminal 21) and mode
selection damper control motor and potentiometer
connector C-102 (terminals 5, 7 and 3) in good
condition?
YES : Go to Step 6.
NO : Repair the wiring harness. Then go to Step 7.

STEP 6. Check the mode selection damper control motor
and potentiometer.

CAUTION

Do not apply battery voltage when the damper is in the
FACE or DEF position.
(1) Operate the mode selection damper control motor as

described in the table below.

(2) Measure the resistances between connector terminals 3

and 5, and between 3 and 7, while the mode selection
damper control motor is running. The resistances should
change gradually within the standard value.

Standard value: 0.8 (DEF)

− 4.8 (FACE) kΩ

Q: Are the mode selection damper control motor and

potentiometer in good condition?
YES : Repair the A/C-ECU. Then go to Step 7.
NO : Replace the mode selection damper control motor

and potentiometer. Then go to Step 7.

LEVER POSITION BATTERY

CONNECTION

LEVER
OPERATION

At the FACE
position

• Connect

terminal 2 to the
positive battery
terminal

• Connect

terminal 1 to the
negative battery
terminal

The lever moves
from the FACE
position to the DEF
position

At the DEF position

• Connect

terminal 1 to the
positive battery
terminal

• Connect

terminal 2 to the
negative battery
terminal

The lever moves
from the DEF
position to the
FACE position

AC209789

FACE POSITION

DEF POSITION

AB

1 2

4

3

5

7

6

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-91

STEP 7. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Connect scan tool MB991958 to the data link connector
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?

YES : The procedure is complete.
NO : Return to Step 1.

DTC B1065: Mode Selection Damper Control Motor and Potentiometer

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

A/C-ECU

MODE SELECTION
DAMPER CONTROL
MOTOR AND
POTENTIOMETER

MOTOR
DRIVE
CIRCUIT

Mode Selection Damper Control Motor Circuit