Mitsubishi Galant (2004+). Manual — part 723
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-31
STEP 3. Using scan tool MB991958, check actuator test
item 10, 11, 12: air mix damper motor.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine.
(3) Use scan tool MB991958 to run the actuator test.
Item 10: air mix damper motor (MAX COOL position)
Item 11: air mix damper motor (middle position)
Item 12: air mix damper motor (MAX HOT position)
• Check that the air mixing damper control motor oper-
ates.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the motor operate normally?
YES : Replace the A/C-ECU. Then go to Step 7.
NO : Go to Step 4.
STEP 4. Check A/C-ECU connectors C-09, C-10 and air
mixing damper control motor and potentiometer connector
C-105 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Are A/C-ECU connectors C-09, C-10 and air mixing
damper control motor and potentiometer connector
C-105 in good condition?
YES : Go to Step 5.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
to Step 7.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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-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.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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