Mitsubishi Galant 9G. Manual — part 239

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-32

STEP 5. Check the wiring harness between A/C-ECU
connectors C-09 (terminal 32), C-10 (terminal 9) and air
mixing damper control motor and potentiometer connector
C-105 (terminals 2 and 1).
Q: Are the wiring harness between A/C-ECU connectors

C-09 (terminal 32), C-10 (terminal 9) and air mixing
damper control motor and potentiometer connector
C-105 (terminals 2 and 1) in good condition?
YES : Go to Step 6.
NO : Repair the wiring harness. Then go to Step 7.

AC305234

C-09 (B)

C-10 (B)

HARNESS SIDE

C-09

HARNESS SIDE

21

22

23

24

25

26

27

28

29

30

31

32

C-105

C-10

HARNESS SIDE

C-105

AF

CONNECTORS: C-09, C-10, C-105

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-33

STEP 6. Check the air mixing damper control motor and
potentiometer.

CAUTION

Do not apply battery voltage when the damper is in the
MAX COOL or MAX HOT position.
Check the air mix damper control motor by the following proce-
dures.

Q: Are the air mixing damper control motor and

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

potentiometer. Then go to Step 7.

LEVER POSITION BATTERY

CONNECTION

LEVER
OPERATION

At the MAX COOL
position

• Connect

terminal 2 to the
positive battery
terminal

• Connect

terminal 1 to the
negative battery
terminal

The lever moves
from the MAX
COOL position to
the MAX HOT
position

At the MAX HOT
position

• Connect

terminal 1 to the
positive battery
terminal

• Connect

terminal 2 to the
negative battery
terminal

The lever moves
from the MAX HOT
position to the MAX
COOL position

AC206296

MAX HOT POSITION

MAX COOL POSITION

1 2

4

3

5

7

6

AB

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-34

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 B1061, B1062: Mode Selection Damper Control Motor and Potentiometer

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MODE SELECTION
DAMPER CONTROL
MOTOR AND
POTENTIOMETER

JOINT
CONNECTOR (2)

A/C-ECU

Mode Selection Damper Control Motor Potentiometer Circuit

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

55A-35

.

DTC SET CONDITION

• DTC B1061 or B1062 is set if there is an open or

short circuit in the potentiometer input circuit, or if
there is an open in the power circuit or ground cir-
cuit.

.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

• The A/C-ECU, the mode selection damper con-

trol motor and potentiometer, or connector(s) or
wiring between the two may be defective.

Past trouble

• If DTC B1061 or B1062 is stored as a past trou-

ble, carry out diagnosis with particular emphasis
on wiring and connector(s) between the A/C-ECU
and the mode selection damper control motor
and potentiometer. If the connectors and wiring
are normal, and obviously the ECU is the cause
of the trouble, replace the ECU. If in doubt, do not
replace the ECU.

TROUBLESHOOTING HINT

• Malfunction of connector.

• Malfunction of the harness.

• Malfunction of the mode selection damper control

motor and potentiometer.

• Malfunction of the A/C-ECU.

AC305233AW

CONNECTOR: C-10

HARNESS SIDE

C-10 (B)

AC305231CG

CONNECTOR: C-03, C-102

C-03

C-102