Mitsubishi Lancer Evolution IX. Manual — part 557
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-101
ACTUATOR TEST TABLE
M1554005200315
CHECK AT ENGINE-A/T ECU TERMINALS
M1554005400289
Item No.
Check items
Drive content
01
Blower motor
Stop
02
Low speed
03
Middle speed
04
High speed
05
Air mixing damper control motor
Open angle: Approximately 0% (MAX COOL)
06
Opening angle: approximately 50%
07
Open angle: Approximately 100% (MAX HOT)
08
Mode selection damper control motor FACE
09
FOOT
10
DEF
11
Compressor output
OFF
12
ON
13
Outside/inside air selection damper
control motor
Outside air
14
Inside air
38
Idle-up
OFF (A/C high pressure)
39
ON (A/C low pressure)
45
43
42
41
44
52
61
60
4849
63
51
62
50
66
55
65
54
64
53
5657
47
46
67
58
68
59
95
83
94
93
92
91
80
79
72
71
78
82
73
81
74
98
97
96
86
85
84
87
75
88
100
99
76
89
77
90
AC504605
<C-121>
<C-119>
<C-117>
AB
Terminal
No.
Check items
Check conditions
Normal conditions
20
Output to A/C compressor
A/C compressor relay: OFF
System voltage
A/C compressor relay: ON
0 V
30
Condenser fan motor relay
(HI)
Fan inactive state (Engine coolant
temperature: 90
°C or less
System voltage
Fan high-speed rotation state (Engine
coolant temperature: 105
°C or less
1 V or less
31
Condenser fan motor relay
(LOW)
Fan inactive state (Engine coolant
temperature: 90
°C or less)
System voltage
Fan low-speed rotation state (Engine
coolant temperature: 95
− 100°C or less)
1 V or less
83
Input from A/C-ECU (A/C1) When the A/C is in operation (When the air
thermo sensor detects 3
°C or more).
System voltage
65
Input from A/C-ECU (A/C2) When the A/C is under low load
System voltage
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-102
CHECK AT A/C-ECU TERMINALS
M1554005400290
8
2
1
5
3 4
6 7
9 10
20
19
18
17
16
15
14
13
12
11
32
24
29
21
31
30
2223
27
35
33
25
34
26
36
28
AC300196
<C-36>
<C-37>
AC
Terminal
No.
Check items
Check conditions
Normal conditions
1
Interior temperature sensor
Sensor temperature: 25
°C (4kΩ)
2.1
− 2.7V
2
Output to blower pulse controller
When the blower is operating.
0
− 2.5V (Effective
alternating voltage)
3
Back-up power supply
Always
System voltage
4
Input from heater water temperature
sensor
Sensor temperature: 25
°C (4kΩ)
2.1
− 2.7V
5
Input from air mixing damper control
motor potentiometer
When the damper flaps is moving to
the MAX HOT position.
4.1
− 4.6 V
6
Input from mode selection damper
control motor potentiometer
When the damper is moved to the
DEF position.
4.1
− 4.6 V
7
Input from the outside thermo sensor Sensor temperature: 25
°C (4kΩ)
2.1
− 2.7 V
8
Input from the air thermo sensor
Sensor temperature: 25
°C (4kΩ)
2.1
− 2.7 V
9
Photo sensor (-)
Brightness is 0 lux
4.9
− 5.1 V
Brightness is 100,000 lux or more
Approximately 0 V
10
Potentiometer power supply
Always
5 V
11
Input from the A/C pressure sensor
2.6 MPa
3.9 V
12
− 15 -
-
-
16
Rear defogger
When the rear defogger is operating. 2.0 V or less
When the rear defogger is stopped
System voltage
17
Diagnosis set
Ignition switch: ON
A voltmeter needle
fluctuates between
0 and 12 V.
18
Input from diagnosis
Ignition switch: ON
Approximately 5 V
19
Photo sensor (+)
Always
0 V
20
Sensors and potentiometers earth
Always
0 V
21
Air outlet changeover damper motor
(FACE)
When the damper is moved to the
FACE position.
10 V
When the damper is moved to the
DEF position.
Faint voltage (0.5
V)
22
Air mix damper motor (MAX COOL)
When the damper flaps is moving to
the MAX COOL position.
10 V
When the damper flaps is moving to
the MAX HOT position.
Faint voltage (0.5
V)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-103
23
Outside/inside air selection damper
control motor (outside)
When the damper is moved to the
inside air recirculation position
10 V (When the
motor is stopped)
When the damper is moved to the
outside air inside air intake position
2.0 V or less
24
Mode selection damper control motor
and potentiometer (DEF)
When the damper is moved to the
FACE position.
Faint voltage (0.5
V)
When the damper is moved to the
DEF position.
10 V
25
Air mixing damper control motor and
potentiometer (MAX HOT)
When the damper flaps is moving to
the MAX COOL position.
Faint voltage (0.5
V)
When the damper flaps is moving to
the MAX HOT position.
10 V
26
outside/inside air selection damper
control motor (inside)
When the damper is moved to the
inside air recirculation position
2.0 V or less
When the damper is moved to the
outside air inside air intake position
10 V (When the
motor is stopped)
27
Earth
Always
Continuity exists.
28
IG2 power supply
Ignition switch: ON
System voltage
29
Illumination earth
Always
Continuity exists.
30
ILL power supply
Lighting switch: ON
System voltage
31
-
-
-
32
Input from the engine-A/T-ECU
(A/C2)
When the A/C is under low load
System voltage
33
Input from the compressor relay
Compressor: ON
System voltage
34
Input from the engine-A/T-ECU
(A/C1)
When the A/C is stopped
0 V
When the A/C is operating (When the
compressor is operating)
System voltage
35
-
-
-
36
ACC power supply
Ignition switch: ACC
System voltage
Terminal
No.
Check items
Check conditions
Normal conditions
ON-VEHICLE SERVICE
HEATER, AIR CONDITIONER AND VENTILATION
55-104
ON-VEHICLE SERVICE
MAGNETIC CLUTCH TEST
M1552008500483
1. Disconnect the magnetic clutch connector to the
magnetic clutch.
2. Connect positive battery voltage directly to the
connector for the magnetic clutch.
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.
COMPRESSOR DRIVE BELT
ADJUSTMENT
M1552001000409
Refer to GROUP 11A, On-vehicle Service
− Drive
Belt Tension Check
DUAL PRESSURE SWITCH CHECK
M1552010400375
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)
the resistance should less than two ohms
between the terminals. If open circuit, replace the
switch.
CHARGING AND DISCHARGING
M1552022200044
Use the refrigerant recovery unit to discharge refrig-
erant gas front the system.
NOTE: Refer to the Refrigerant Recovery and Recy-
cling Unit instruction Manual for operation of the unit.
REFILLING OF OIL IN THE A/C SYSTEM
M1552020000066
Too little oil will provide inadequate compressor lubri-
cation and cause a compressor failure. Too much oil
will increase discharge air temperature.
When a compressor is installed at the factory, it con-
tains 120 mL of compressor oil. While the A/C sys-
tem is in operation, the oil is carried through the
entire system by the refrigerant. Some of this oil will
be trapped and retained in various parts of the sys-
tem.
When the following system components are
changed, it is necessary to add oil to the system to
replace the oil being removed with the component.
Compressor oil: SUN PAG 56
Quantity
Evaporator: 60 mL
Condenser: 15 mL
Flexible suction hose: 10 mL
Receiver: 10 mL
PERFORMANCE TEST
M1552001400429
1. The vehicles to be tested should be in a place that
is not in direct sunlight.
AC005671
Magnetic clutch connector
AC
AC001368 AD
High/Low
Pressure Side
Low-pressure side
High-pressure side
ON
OFF
ON
OFF
2650 ± 200
2060 ± 200
230 ± 20
210 ± 25
(kPa)
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