Mitsubishi Lancer Evolution VI. Manual — part 113
HEATER AND MANUAL AIR CONDITIONER –
Troubleshooting
55-4
TROUBLESHOOTING
TROUBLESHOOTING PROCEDURES
1.
Check air ducts, control rods, etc. for improper connection.
2.
Check that the electrical connectors of the relevant components are connected securely and the
fuse is not blown.
3.
Perform the troubleshooting as follows; first understand the items to be inspected and the the procedures
comprehensively using Trouble Symptom/Failed Component Cross-Reference Table and then inspect
the appropriate items sequentially.
4.
Be sure to perform each component check after disconnecting the relevant connector.
Trouble Symptom/Failed Component Cross-Reference Table
Items to be checked
1.
When the igni-
tion switch is
“ON”, the A/C
does not oper-
ate.
2.
When the A/C
is operating,
temperature
inside the pas-
senger
compartment
does not
decrease (cool
air is not
emitted).
3.
Blower fan
motor does not
turn.
4.
Blower fan
motor does not
stop turning.
5.
When A/C is
operating,
radiator fan
and condenser
fan do not run.
Fuse
1
1
1
Harness, connector
2
2
1
2
Amount of refrigerant
3
1
A/C compressor relay
4
A/C compressor magnet
clutch
5
Dual pressure switch
6
2
3
A/C switch
7
Blower switch
8
3
2
Blower relay
4
Resistor
5
3
Blower motor
6
Air thermo-sensor
9
3
Condenser fan relay
4
4
Condenser fan motor
5
5
Radiator fan relay (HI, LO)
6
6
Radiator fan motor
7
7
Refrigerant temperature
switch
10
8
Auto compressor control
unit
11
9
Engine-ECU
12
10
8
HEATER AND MANUAL AIR CONDITIONER –
Troubleshooting
55-5
No.
Trouble symp-
tom
Problem cause
Remedy
Refer-
ence
page
1
When the igni-
tion switch is
“ON”, the A/C
does not oper
Refrigerant leak or overfilling of refriger-
ant
Replenish the refrigerant, repair the
leak or take out some of the
refrigerant
55-6
does not oper-
ate.
A/C compressor relay is defective
Replace the A/C compressor relay
55-14
ate.
A/C compressor magnetic clutch is
defective
Replace the A/C compressor magnet
clutch
55-26
Dual pressure switch is defective
Replace the dual pressure switch
55-13
A/C switch is defective
Replace the A/C switch
55-17
Blower switch is defective
Replace the blower switch
55-17
Air thermo-sensor is defective
Replace the air thermo-sensor
55-22
Refrigerant temperature switch is defec-
tive
Replace the refrigerant temperature
switch
55-25
Automatic compressor-ECU is defective
Replace the automatic compressor-
ECU
–
2
When the A/C is
operating, tem-
perat re inside
Refrigerant leak
Replenish the refrigerant and repair
the leak
55-6
perature inside
the passenger
Dual pressure switch is defective
Replace the dual pressure switch
55-13
the passenger
compartment
doesn’t
de-
Air thermo-sensor is defective
Replace the air thermo-sensor
–
doesn t
de-
crease (cool air
is not emitted)
Condenser fan relay is defective
Replace the condenser fan relay
55-14
is not emitted).
Condenser fan motor is defective
Replace the condenser fan motor
55-29
Radiator fan relay (HI, LO) is defective
Replace the radiator fan relay (HI, LO)
55-14
Radiator fan motor is defective
Replace the radiator fan motor
–
Refrigerant temperature switch is defec-
tive
Replace the refrigerant temperature
switch
55-25
Automatic compressor-ECU is defective
Replace the automatic compressor-
ECU
–
3
Blower fan mo-
tor doesn’t turn
Blower switch is defective
Replace the blower switch
55-17
tor doesn’t turn.
Blower relay is defective
Replace the blower relay
55-13
Resistor is defective
Replace the resistor
55-21
Blower fan motor is defective
Replace the blower fan motor
55-21
4
Blower fan mo-
tor doesn’t stop
t rning
Defective harness between the blower
fan motor and the blower switch
Repair the harness
–
turning.
Blower switch is defective
Replace the blower switch
55-17
Resistor is defective
Replace the resistor
55-21
5
When the A/C is
operating
con
Condenser fan relay is defective
Replace the condenser fan relay
55-14
operating con-
denser fan or
Condenser fan motor is defective
Replace the condenser fan motor
55-29
denser
an or
radiator fan
does not run
Radiator fan relay (HI, LO) is defective
Replace the radiator fan relay (HI, LO)
55-14
does not run.
Radiator fan motor is defective
Replace the radiator fan motor
–
Dual pressure switch is defective
Replace the dual pressure switch
55-13
Engine-ECU is defective
Replace the engine-ECU
–
HEATER AND MANUAL AIR CONDITIONER –
Troubleshooting /
On-vehicle Service
55-6
INSPECTION AT THE AUTOMATIC COMPRESSOR-ECU TERMINAL
Terminal
No.
Check item
Checking requirements
Normal condition
1
Output from ECU to A/C compressor
relay
A/C compressor relay: OFF
System voltage
relay
A/C compressor relay: ON
0 V
2
Input from A/C switch to ECU
A/C switch: OFF
0 V
A/C switch: ON
System voltage
3
Earth
Always
0 V
ON-VEHICLE SERVICE
REFRIGERANT CHARGING
Caution
The refrigerant generates toxic gases when it is expored
to a heat source such as fire. Keep flames away from
the refrigerant. Perform refrigerant charging at a
well-ventilated place.
1.
Recommended charging tools
The following commercially available tools are recommended
for discharging and charging refrigerant.
D
Gas charging set [No. EA95 (R134a)]
D
Gas charging set case [No. EA101CS-2]
D
Gauge manifold [No. EA101N-1]
D
Charging valve [No. EA108N]
D
Adapter valve [No. EA104AD-3]
NOTE
The adapter valve opens when the handle is turned
clockwise and closes when it is turned counter-clockwise.
D
Quick joint (for low pressure) [No. EA413L]
D
Quick joint (for high pressure) [No. EA413H]
D
Charging hose (red) [No. EA104N-1]
D
Charging hose (blue) [No. EA104N-2]
D
Charging hose (yellow) [No. EA104N-3]
D
Vacuum pump [No. EA112A]
D
Vacuum pump adaptor [No. EA112X]
Gauge manifold
Adapter valve
(for low pressure)
Charging hose
Vacuum
pump adaptor
Quick joint
(for low pressure)
Charging valve
Quick joint
(for high pressure)
Vacuum pump
HEATER AND MANUAL AIR CONDITIONER –
On-vehicle Service
55-7
2.
Charging
1.
Open the low-pressure valve of the gauge manifold. Keep
the high-pressure valve closed.
2.
With the handles turned back all the way (valve closed),
install the adaptor valve to the low-pressure side of the
gauge manifold.
3.
Connect the charging hose (blue) to the adaptor valve
1.
4.
Connect the quick joint 2 to the charging hose (blue).
5.
Connect the quick joint 2 to the low pressure service
valve.
NOTE
The low-pressure service valve is provided on the suction
pipe.
Caution
(1) To install the quick joint, press section “A” firmly
against the service valve until a click is heard.
(2) When connecting, run your hand along the hose
while pressing to ensure that there are no bends
in the hose.
6.
Connect the charging hose (yellow) to the valve 3 of
the gauge manifold.
7.
Install the vacuum pump adaptor to the vacuum pump.
Caution
To supply the power, connect the power supply plug
of the vacuum pump to the vacuum pump adapter
and then the power supply plug of the vacuum pump
adapter to a 100 V power outlet.
8.
Connect the charging hose (yellow) to the R134a
connection port of the vacuum pump adaptor.
9.
Tighten the adaptor valve 1 handle (valve closed).
10. Turn the power switch of the vacuum pump to the ON
position.
NOTE
Even if the vacuum pump power switch is turned ON,
the vacuum pump will not operate because of the power
supply connection in step (7).
11. Turn the vacuum pump adaptor switch to the R134a side
to start the vacuum pump.
Low-
pressure
valve
High-
pressure
valve
Gauge
manifold
Adapter
valve (for low
pressure)
Charging hose (yellow)
Charging hose
(blue)
To 100 V
power
outlet
Switch
R134a
connec-
tion port
Vacuum
pump
adaptor
Vacuum
pump
Power
supply
plug
Quick joint
(for low
pressure)
Low-
pressure
service
valve
Sleeve
Low-
pressure
gauge
High-
pressure
gauge
Valve
High-
pressure
service
valve
Air
condi-
tioning
system
A
Power
supply
plug
Switch
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