Mitsubishi Montero (2004+). Manual — part 661
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-133
STEP 2. Check the wiring harness between A/C-ECU
connector D-23 (terminal 9), D-24 (terminal 29) and A/C
compressor connector B-30 (terminal 1, 2).
NOTE: Also check intermediate connector E-111. If intermedi-
ate connector E-111 is damaged, repair or replace the connec-
tor as described in GROUP 00E, Harness Connector
Inspection
.
Q: Is the wiring harness between A/C-ECU connector D-23
(terminal 9), D-24 (terminal 29) and A/C compressor
connector B-30 (terminal 1, 2) in good condition?
YES : Go to Step 3.
NO : Repair the wiring harness. Check that the air
conditioning works normally.
AC204169
CONNECTOR : B-30
AE
B-30(B)
B-30(B)
2
3
1
HARNESS
SIDE
AC204188
CONNECTORS : D-23, D-24
D-24(B)
D-24(B)
D-23(B)
D-23(B)
HARNESS SIDE
HARNESS SIDE
BH
22
30 29
21
23
31
25
26
33
34
32
24
28
3635
27
1
3
4
2
12
1413
11
6
7
8
10 9
18
19
20
16
17
5
15
AC204176
CONNECTOR : E-111
BF
15
4
14
37
36
26 27
12
11
35
34
23 24
3
13
25
9
2
8
32
20 21
6
5
17
29
30
18
1
7
19
31
10
22
33
16
28
38
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-134
STEP 3. Replace the lock sensor.
Q: Does the air conditioning work normally?
YES : No action is necessary and testing is complete.
NO : Replace the A/C-ECU (Refer to
). Check
that the air conditioning works normally.
DATA LIST REFERENCE TABLE
M1554005100169
MUT-III SCAN
TOOL DISPLAY
ITEM
NO.
INSPECTION ITEM INSPECTION REQUIREMENT
NORMAL VALUE
A/M DAMPER
31
Air mixing damper
control motor
potentiometer
Ignition switch: ON Damper
position
Opening degree (%)
MAX. HOT
Approx. 100
MAX. COOL
Approx. 0
OUTSIDE TEMP 13
Outside air
temperature sensor
Ignition switch: ON
Outside air
temperature and
temperature
displayed on scan
tool are identical.
EVAP TEMP
21
A/C sensor
Ignition switch: ON
The temperature of
the air, which flows
through the
evaporator, and
temperature
displayed on scan
tool are identical.
AIR OUT POS
32
Mode selection
damper control
motor potentiometer
Ignition switch: ON Damper
position
Opening degree (%)
FACE
Approx. 0
FOOT
Approx. 50
FOOT/DEF.
Approx. 75
DEF.
Approx. 100
PHOTO SNSR
25
Photo sensor
Ignition switch: ON
Amount of incident
light is proportional
to voltage displayed
on scan tool.
INSIDE TEMP
11
Inside air
temperature sensor
Ignition switch: ON
Inside air
temperature and
temperature
displayed on scan
tool are identical.
HEATER TEMP
15
heater water
temperature sensor
Ignition switch: ON
ON when heater
core wall
temperature is 30
°C
(86
°F) or higher.
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-135
ACTUATOR TEST REFERENCE
M1554005200155
CHECK AT ECU TERMINAL
M1554005400171
MUT-III SCAN TOOL
DISPLAY
ITEM
NO.
INSPECTION ITEM
DRIVE CONTENT
A/M 0%
05
Air mix damper motor
Opening degree: approx. 0%
A/M 100%
07
Opening degree: approx. 100%
A/M 50%
06
Opening degree: approx. 50%
CLUTCH OFF
11
A/C compressor
OFF
CLUTCH ON
12
ON
DEF
10
Air outlet changeover damper motor DEF
FACE
08
FACE
FAN HI
04
Blower motor
HI
FAN LO
02
LO
FAN ME
03
ME
FAN OFF
01
OFF
FOOT
09
Air outlet changeover damper motor FOOT
FRESH
13
Inlet/outlet air changeover damper
motor
FRESH
RECIRC
14
RECIRCULATION
1
2 3 4 5 6
7 8
9 10
11 12 13 14 15 16 17 18 19 20
32 33 34
29
30 31
21 22 23 24 25 26 27 28
35 36
AC002694
TERMINAL
NO.
INSPECTION ITEM
INSPECTION CONDITION
NORMAL
CONDITION
1
Air mixing damper control
motor
When the air mix damper is moved to the
MAX. COOL position.
10 V
When the air mix damper is moved to the
MAX. HOT position.
0.5 V
2
Mode selection damper control
motor (FACE)
When the damper is moved to the FACE
position.
10 V
When the damper is moved to the DEF
position.
0.5 V
3
Inside/outside air changeover
damper motor (inside air)
When the damper flap is moving to the
inside air recirculation position.
0.5 V
When the damper flap is moving to the
outside air induction position.
10 V (when the
motor is stopped)
4
Inside/outside air changeover
damper motor (FRESH)
When the damper flap is moving to the
inside air recirculation position.
0 V (when the
motor is stopped)
When the damper flap is moving to the
outside air induction position.
0.5 V
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-136
5
Request signal for turning the
A/C compressor on
Dual pressure switch: OFF
System voltage
Dual pressure switch: ON
0 V
6
RV meter communication line
Ignition switch: ON
Hi: 4
− 5 V
Lo: 0
− 1 V
7
PCM communication line
When the A/C is off.
0 V
When the A/C (compressor) is operating System voltage
8
-
-
-
9
Lock sensor input
When the compressor is operating
0
− 0.75 V (pulse
signal)
10
Heater blower controller unit
output
When the blower is operating
0
− 3.5 V
(alternative
effective value)
11
Air mixing damper control
motor
When the air mix damper is moved to the
MAX. COOL position.
0.5 V
When the air mix damper is moved to the
MAX. HOT position.
10 V
12
Air outlet changeover damper
motor (DEF)
When the damper is moved to the FACE
position.
0.5 V
When the damper is moved to the DEF
position.
10 V
13
-
-
-
14
Blower relay
When the blower is stopped
System voltage
When the blower is operating
0 V
15
Rear defogger
Rear defogger: OFF
System voltage
Rear defogger: ON
0 V
16
RV meter communication line
Ignition switch: ON
Hi: 4
− 5 V
Lo: 0
− 1 V
17
RV meter communication line
Ignition switch: ON
Hi: 4
− 5 V
Lo: 0
− 1 V
18
RV meter communication line
shield
At all times
0 V
19
Diagnosis code set
Ignition switch: ON
0
⇔ Battery
positive voltage
20
A/C compressor relay input
When the A/C is off.
0 V
When the A/C (compressor) is operating System voltage
21
Potentiometer power supply
At all times
5 V
22
Outside air temperature sensor
input
When sensor section temperature is
25
°C (77°F) [4 kΩ]
1.9 V
23
Heater water temperature
sensor input
When sensor section temperature is
25
°C (77°F) [4 kΩ]
2.8 V
24
Air mixing damper control
motor potentiometer input
When the damper door has moved to the
MAX. HOT position.
0.7
− 1.3 V
25
ILL power supply
Lighting switch: ON
System voltage
TERMINAL
NO.
INSPECTION ITEM
INSPECTION CONDITION
NORMAL
CONDITION
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