Mitsubishi Montero (2004+). Manual — part 633
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-21
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B (Vehicles without
CAN communication system)
STEP 1. Using scan tool MB991958, check data list item 31:
Air mix damper potentiometer.
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.
Check the data list.
Item 31: Air mix damper potentiometer
Q: Does the data list show approximately 100% (during
MAX HOT), and approximately 0% (during MAX COOL)?
YES : It can be assumed that this malfunction is intermittent
(Refer to GROUP 00 - How to Cope with Intermittent
Malfunction
NO : Go to Step 2.
AC307591 AB
MB991911
DATA LINK
CONNECTOR
MB991824
MB991827
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-22
STEP 2. 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 mixing damper control motor by the following pro-
cedures.
While checking the air mixing damper control motor, measure
the resistances between terminals numbers 3 and 5 as well as
numbers 3 and 7. At this time, the resistances should change
gradually within the standard value.
Standard value: 1.2
− 4.8 kΩ
Q: Does air mixing damper control motor and
potentiometer work normally?
YES : Go to Step 3.
NO : Replace the air mixing damper control motor and
potentiometer. Then go to Step 5.
LEVER
POSITION
BATTERY
CONNECTION
LEVER
OPERATION
At the MAX
COOL position
• Connect terminal 1
to the positive
battery terminal
• Connect terminal 2
to the negative
battery terminal
The lever moves
from the MAX
COOL position to
the outside position
At the MAX
HOT position
• Connect terminal 2
to the positive
battery terminal
• Connect terminal 1
to the negative
battery terminal
The lever moves
from the MAX HOT
position to the
inside position
ACX01456
MAX HOT
POSITION
MAX COOL
POSITION
AB
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-23
STEP 3. Check air mixing damper control motor and
potentiometer connector D-20 and A/C-ECU connector
D-24 for damage.
Q: Is air mixing damper control motor and potentiometer
connector D-20 and A/C-ECU connector D-24 in good
condition?
YES : Go to Step 4.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. Then go
to Step 5.
STEP 4. Check the wiring harness between air mixing
damper control motor and potentiometer connector D-20
(terminals 7, 3 and 5) and A/C-ECU D-24 (terminals 21, 24
and 29).
Q: Is the wiring harness between air mixing damper control
motor and potentiometer connector D-20 (terminals 7, 3
and 5) and A/C-ECU D-24 (terminals 21, 24 and 29) in
good condition?
YES : Replace the A/C-ECU (Refer to
). Then go
to Step 5.
NO : Repair the wiring harness. Then go to Step 5.
AC204188
CONNECTORS : D-20, D-24
D-24(B)
D-24(B)
BY
D-20
D-20
HARNESS SIDE
HARNESS SIDE
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
7 6 5 4 3 2 1
AC204188
CONNECTORS : D-20, D-24
D-24(B)
D-24(B)
BY
D-20
D-20
HARNESS SIDE
HARNESS SIDE
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
7 6 5 4 3 2 1
AUTO A/C DIAGNOSIS
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AUTOMATIC AIR CONDITIONING
55B-24
STEP 5. Recheck for diagnostic trouble code.
Q: Is DTC 31 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC 32: Potentiometer System of Air Outlet Changeover Damper Control Motor Assembly.
.
DTC SET CONDITION
• DTC 32 is output if there is an open or short cir-
cuit in the potentiometer input circuit, or if there is
an open circuit in the power circuit or earth circuit.
.
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.
Air Outlet Changeover Damper Potentiometer Circuit
AC205351
AC204170
CONNECTORS : D-22, D-24
DU
D-24(B)
D-22(B)
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