Mitsubishi Galant 9G. Manual — part 241
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.
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
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-41
.
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.
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
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
Cope with Intermittent Malfunctions
.
NO : Go to Step 3.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-43
STEP 3. Using scan tool MB991958, check actuator test
item 13, 14, 15, 16, 17: Air outlet c/o dumper.
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 13: air mix damper motor (FACE position)
Item 14: air mix damper motor (FOOT/FACE position)
Item 15: air mix damper motor (FOOT position)
Item 16: air mix damper motor (DEF/FOOT position)
Item 17: air mix damper motor (DEF position)
• Check that the mode selection damper control motor
operates.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor within the specified range?
YES : Replace the A/C-ECU. Then go to Step 7.
NO : Go to Step 4.
STEP 4. Check A/C-ECU connector C-09 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 connector C-09 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
. Then go
to Step 7.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305233
C-09 (B)
HARNESS SIDE
21
22
23
24
25
26
27
28
29
30
31
32
BB
CONNECTOR: C-09
AC305231
C-102
HARNESS SIDE
CD
CONNECTOR: C-102
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