Mitsubishi Lancer Evolution 7. Manual — part 401
HEATER, AIR CONDITIONER AND VENTILATION
-
Troubleshooting
55-11
Inspection procedure 9
Condenser fan not working only for HI
Probable cause
If the condenser fan does not work only for HI, the condenser fan circuit system
or the condenser fan relay (HI) circuit system may be defective.
D
Condenser fan motor fault
D
Condenser fan relay (HI) fault
D
Harness or connector fault
D
Engine-ECU fault
NG
Check the harness between the condenser fan relay (HI) and
the Ignition switch (IG2), and repair if necessary.
OK
Check the trouble
symptoms.
NG
Repair
NG
Replace
OK
Check the condenser fan motor. (Refer to P.55-40.)
Check the following connectors: A-07X, C-135, C-102,
C-209, C-210.
OK
NG
Check the harness between<L.H.D.>the condenser fan relay
(HI) and the fusible link (2)
, and between<R.H.D.>the condenser fan relay (HI) and the
battery, and repair if necessary.
OK
Check the trouble
symptoms.
Repair
Check the following connectors: A-07
NG
NG
OK
Check the trouble
symptoms.
Repair
NG
Check the following connectors:
<L.H.D.> A-07X, A-43, C-122.
<R.H.D.> A-07X, C-136,C-122
Replace the Engine-ECU.
OK
Repair
NG
Check the harness betweenthe condenser fan relay (HI) and
the Engine-ECU.
(2) NG
Measure at the condenser fan relay (HI) A-07X.
D
Disconnect the connector and measure at the junction box
side.
D
Ignition switch: ON
(1) Voltage between terminal 2 and body earth.
OK : Battery voltage
(2) Voltage between terminal 4 and body earth.
OK : Battery voltage
(1) NG
NG
Replace
OK
Check the condenser fan relay (HI) . (Refer to P.55-23.)
NG
Check the harness betweenthe condenser fan relay (HI) and
the condenser fan motor, and repair if necessary.
OK
Check the trouble
symptoms.
Repair
Check the following connectors: A-07X, A-45.
OK
HEATER, AIR CONDITIONER AND VENTILATION
-
Troubleshooting
HEATER, AIR CONDITIONER AND VENTILATION
-
Troubleshooting
55-12
CHECK AT THE ENGINE-ECU TERMINAL
Terminal no.
Check item
Check when
Normal state
21
Fan controller output
Radiator fan: ON
0 - 0.3 V
p
Radiator fan: OFF
0.7 V or more
22
A/C compressor output
A/C compressor relay: OFF
0 V
p
p
A/C compressor relay: ON
Battery voltage
or temporarily
6V or more→
1V or less
24
A/C-ECU input (A/C2)
At A/C low load
Battery voltage
32
Condenser fan motor relay (HI)
Fan: OFF(engine coolant temperature:90_C
or lower)
Battery voltage
Fan:
ON(engine
coolant
tempera-
ture:105_C or lower)
1V or more
34
Condenser fan motor relay (LOW)
Fan: OFF(engine coolant temperature:90_C
or lower)
Battery voltage
Fan:
ON(engine
coolant
tempera-
ture:105_C or lower)
1V or more
45
A/C-ECU input (A/C1)
A/C ON (When dual pressure switch is ON)
Battery voltage
CHECK AT THE A/C-ECU TERMINAL <L.H.drive vehicles>
Termi-
nal no.
Check item
Check when
Normal state
1
Rear defogger switch
Defogger switch: ON
0 V
gg
Defogger switch: OFF
Battery voltage
2
Inside/outside
air
changeover
d
t ( t id
i )
When damper moved to inside circulation position
0 V
g
damper motor (outside air)
When damper moved to outside air induction
position
Battery voltage
3
Inside/outside
air
changeover
d
t (i id
i )
When damper moved to inside circulation position
Battery voltage
g
damper motor (inside air)
When damper moved to outside air induction
position
0 V
4
Engine-ECU output (A/C1)
When A/C OFF
0 V
g
p (
)
A/C switch: ON, blower: ON (room temperature)
Battery voltage
5
Engine-ECU output (A/C2)
At A/C low load
Battery voltage
g
p (
)
At A/C high load
0 V
6
Illumination power supply
Lighting switches: ON
Battery voltage
7
-
-
-
8
Blower switch (LO)
Blower switch: LO
Battery voltage
HEATER, AIR CONDITIONER AND VENTILATION
-
Troubleshooting
55-13
Termi-
nal no.
Normal state
Check when
Check item
9
-
-
-
10
Ignition switch (IG2) power supply
Ignition switch: ON
Battery voltage
11
Illumination earth
Any time
0 V
12
Earth
Any time
0 V
13
Air thermo sensor
When temperature around sensor 25_C (1.5kΩ)
2.2 V
14
-
-
-
15
-
-
-
16
Air thermo sensor earth
Any time
0 V
CHECK AT THE A/C-ECU TERMINAL <R.H.drive vehicles>
Termi-
nal no.
Check item
Check when
Normal state
1
Engine-ECU output (A/C1)
When A/C OFF
0 V
g
p (
)
A/C switch: ON, blower: ON (room temperature)
Battery voltage
2
Engine-ECU output (A/C2)
At A/C low load
Battery voltage
g
p (
)
At A/C high load
0 V
3
Earth
Any time
0 V
4
Air thermo sensor earth
Any time
0 V
5
Illumination power supply
Lighting switches: ON
Battery voltage
6
Air thermo sensor
When temperature around sensor 25_C (1.5kΩ)
2.2 V
7
Ignition switch (IG2) power supply
Ignition switch: ON
Battery voltage
8
Blower switch (LO)
Blower switch: LO
Battery voltage
9
Rear defogger switch
Defogger switch: ON
0 V
gg
Defogger switch: OFF
Battery voltage
10
Inside/outside
air
changeover
d
t ( t id
i )
When damper moved to inside circulation position
0 V
g
damper motor (outside air)
When damper moved to outside air induction
position
Battery voltage
11
Inside/outside
air
changeover
d
t (i id
i )
When damper moved to inside circulation position
Battery voltage
g
damper motor (inside air)
When damper moved to outside air induction
position
0 V
12
Illumination earth
Any time
0 V
HEATER, AIR CONDITIONER AND VENTILATION
–
On-vehicle Service
55-14
ON-VEHICLE SERVICE
REFRIGERANT LEVEL TEST THROUGH
PERFORMANCE TEST
1. Start the engine.
2. Turn on the A/C switch, and set the A/C control to MAX.
COOL.
3. Adjust the engine speed to 1,500 r/min.
4. Check the refrigerant level (bubble state) through the
sight glass.
Item
State
Insufficient refriger-
ant
Many bubbles are seen. If refrigerant
is extremely low, it appears white.
Sufficient or excess
refrigerant
No bubbles are seen
NOTE
1. If insufficient, replenish the refrigerant as follows.
a) Replenish until bubbles disappear from the sight
glass.
b) After the bubbles disappear from the sight glass,
replenish 100g of refrigerant.
2. If excessive, replenish the refrigerant as follows.
a) Drain the refrigerant until bubbles can be seen
through the sight glass.
b) Replenish until bubbles disappear from the sight
glass.
c) After the bubbles disappear from the sight glass,
replenish 100g of refrigerant.
MAGNETIC CLUTCH TEST
1. Disconnect the connector to the magnetic clutch.
2. Connect battery (+) voltage directly to the connector for
the magnetic clutch.
3. If the magnetic clutch is normal, there will be ”click”. If
the pulley and armature do not make contact (’click’),
there is a malfunction.
RECEIVER DRIER TEST
Operate the unit and check the piping temperature by touching
the receiver drier outlet and inlet.
If there is a difference in the temperatures, the receiver drier
is restricted.
Replace the receiver drier.
Insufficient
refrigerant
Sufficient or excess
refrigerant
Bubbles
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