Mitsubishi Montero (2002-2004). Manual — part 63
REAR AIR CONDITIONING DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-115
STEP 11. Check the wiring harness between rear A/C
control unit connector E-20 (terminal 9, 10 and 11) and
mode selection damper control motor connector G-22-3
(terminal 6, 4 and 3).
NOTE: Also check intermediate connector D-112 and rear A/C
unit connector G-22. If intermediate connector D-112 and rear
A/C unit connector G-22 is damaged, repair or replace the con-
nector as described in GROUP 00E, Harness Connector
Inspection
.
Q: Is the wiring harness between rear A/C control unit
connector E-20 (terminal 9, 10 and 11) and mode
selection damper control motor connector G-22-3
(terminal 6, 4 and 3) in good condition?
YES : Go to Step 12.
NO : Repair the wiring harness. Check that the rear air
conditioning works normally.
AC204176
CONNECTOR : E-20
AY
HARNESS SIDE
7
8
3
10 9
2
4
11
1312
5
14
6
1
AC204698
CONNECTOR : G-22-3
AG
HARNESS SIDE
7 6 5 4 3 2 1
AC204171 AL
CONNECTOR : D-112
2 3
27
32
28
33
16
15
4 5
19
18
29
17
34
7 8
35
22
21
9 10
30
36
31
37
25
24
23
6
20
1
14
26
11
13
12
38
AC204179
CONNECTOR : G-22
AP
HARNESS SIDE
1
5
7
8
2
6
10
4
9
3
REAR AIR CONDITIONING DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-116
STEP 12. Replace the mode selection damper control
motor connector.
Q: Do the air conditioning work normally?
YES : No action is necessary and testing is complete.
NO : Replace the rear A/C control unit. Check that the air
conditioning works normally.
CHECK AT ECU TERMINAL
M1554005400074
ACX00820
TERMINAL
NO.
INSPECTION ITEM
INSPECTION CONDITION
NORMAL
CONDITION
1
Magnetic valve
Magnetic valve: OFF
Battery positive
voltage
Magnetic valve: ON
0.5 V
2
Ground
At all times
0 V
3
Input from temperature adjusting
switch
Temperature switch: MAX HOT
1 V
Temperature switch: MAX COOL
4 V
4
Air mixing damper control motor
potentiometer power supply
At all times
5 V
5
Power supply (IG2)
Ignition switch: ON
Battery positive
voltage
Ignition switch: OFF
0 V
6
Air mixing damper control motor
<Vehicles with rear heater or
Rear A/C>
When the damper is moving toward
the MAX COOL position.
10 V
When the damper is moving toward
the MAX HOT position.
0 V
7
Air mixing damper control motor
potentiometer input signal
<Vehicles with rear heater or
Rear A/C>
Air mix damper: MAX HOT position
1 V
Air mix damper: MAX COOL position 4 V
8
Sensor and potentiometer
ground
At all times
0 V
9
Air outlet changeover damper
motor signal <Vehicles with Rear
A/C>
Ignition switch: ON
0
− 12 V
10
Air outlet changeover damper
motor signal <Vehicles with Rear
A/C>
Ignition switch: ON
0
− 12 V
11
Air outlet changeover damper
motor signal <Vehicles with Rear
A/C>
Ignition switch: ON
0
− 12 V
12
Air thermo sensor input signal
Sensing part temperature: 25
°C (77
°F) (1.5 kΩ)
2.2 V
SPECIAL TOOLS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-117
SPECIAL TOOLS
M1552000600141
13
Rear fan switch or front rear fan
switch input
Rear fan switch or front rear fan
switch: ON
0 V
14
Air mixing damper control motor
(MAX HOT) <Vehicles with rear
heater or Rear A/C>
When the damper is moving toward
the MAX COOL position.
0.5 V
When the damper is moving toward
the MAX HOT position.
Battery positive
voltage
TERMINAL
NO.
INSPECTION ITEM
INSPECTION CONDITION
NORMAL
CONDITION
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
MB991367
Special spanner
MB991367-01
Armature mounting nut of
compressor removal and
installation
MB991386
Pin
MIT217213l
MB990784
Ornament remover
General service tool
Center panel removal
B991367
MB990784
ON-VEHICLE SERVICE
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-118
ON-VEHICLE SERVICE
REFRIGERANT LEVEL TEST
M1552008400152
Use the refrigerant recovery station to remove all of the refrig-
erant, and then calculate the amount of the refrigerant and
charge it.
MAGNETIC CLUTCH TEST
M1552008500342
1. Disconnect the magnetic clutch connector to the magnetic
clutch.
2. Connect the positive battery terminal to the air conditioning
compressor clutch connector terminal 3, and ground the
negative battery terminal to the body of the compressor.
3. If the magnetic clutch is normal, there will be a "click." If the
pulley and armature do not make contact ("click"), there is a
malfunction.
RECEIVER DRIER TEST
M1552008600123
Turn the A/C on. Check the temperature by touching the
receiver drier outlet and inlet pipes. If there is a difference in the
temperatures of the two pipes, the receiver assembly is
restricted. Replace the receiver assembly.
DUAL PRESSURE SWITCH CHECK
M1552010400267
1. Remove the dual pressure switch connector and connect
the high/low pressure side terminals located on the harness
side as shown in the illustration.
2. Install a gauge manifold to the high-pressure side service
valve of the refrigerant line. (Refer to
3. When the high/low pressure sides of the dual pressure
switch are at operation pressure (ON) and there is continuity
between the respective terminals, then the condition is
normal. If there is no continuity, replace the switch.
ACX01440AB
ITEM
OFF to ON
ON to OFF
Low-pressure side kPa
(psi)
223
± 27 (32.4
± 3.9)
196
± 20 (28.4
± 2.9)
High-pressure side kPa
(psi)
2,550
± 200
(369.9
± 29)
3,140
± 200
(455.5
± 29)
ACX00822
ON
OFF
196 ± 20
(284 ± 2.9)
223 ± 27
(32.4 ± 3.9)
2,550 ± 200
(369.9 ± 29)
3,140 ± 200
(455.5 ± 29)
kPa
(psi)
DUAL PRESSURE
SWITCH
AF
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