Mitsubishi Galant (2004+). Manual - part 725

 

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Mitsubishi Galant (2004+). Manual - part 725

 

 

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-39

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) k

Q: Are the mode selection damper control motor and 

potentiometer in good condition?
YES : 
Replace 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-40

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

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-41

DTC B1065:  Mode Selection Damper Control Motor and Potentiometer

.

DTC SET CONDITION

• If the air mixing damper control motor does not 

work normally, DTC B1065 will be set.

.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

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

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

Past trouble

• If DTC B1065 is stored as a past trouble, carry 

out diagnosis with particular emphasis on wiring 
and connector(s) between the A/C-ECU and the 
mode selection damper control motor and poten-
tiometer. If the connectors and wiring are normal, 
and obviously the ECU is the cause of the trou-
ble, 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.

A/C-ECU

MODE SELECTION
DAMPER CONTROL
MOTOR AND
POTENTIOMETER

MOTOR
DRIVE
CIRCUIT

Mode Selection Damper Control Motor Circuit

AC305233

CONNECTOR: C-09

BC

C-09 (B)

AC305231

C-102

CF

CONNECTOR: C-102

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-42

DIAGNOSIS

Required Special Tool:

•  MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A (Vehicles with CAN 

communication system)

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.

Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to "ON" position.

(3) Diagnose the CAN bus line.
Q: Is the check result satisfactory?

YES : Go to Step 2.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C, 

Diagnosis-Can Bus Diagnostic Chart 

P.54C-621

). 

Then go to Step 7.

STEP 2. Recheck for diagnostic trouble code.

Recheck if the DTC is set.

1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.

Q: Is the check result satisfactory?

YES : It can be assumed that this malfunction is intermittent. 

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

− How to 

Use Troubleshooting/Inspection Service Points 

P.00-6

.

NO :  Go to Step 3. 

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

 

 

 

 

 

 

 

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