2005 MITSUBISHI LANCER air condition

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-64
STEP 8. Connector check: B-114 A/C compressor
connector
Q: Is the check result normal?
YES :
Go to Step 9.
NO : Repair the connector.
STEP 9. Check the wiring harness between B-17X
A/C compressor relay connector terminal No.4
and B-114 A/C compressor connector terminal
No.1.
AC303782
Connector: B-114
<4G1-L.H.D.>
AC
Harness side
B-114 (B)
AC303790
Connector: B-114
<4G6-L.H.D.>
AC
Harness side
B-114 (B)
AC303786
Connector: B-114
<4G1-R.H.D.>
AB
Harness side
B-114 (B)
AC303794
Connector: B-114
<4G6-R.H.D.>
AB
Harness side
B-114 (B)
AC304988AB
Connector: B-17X
Front of
vehicle
1
3 2
4
Relay box side
AC303782
Connector: B-114
<4G1-L.H.D.>
AC
Harness side
B-114 (B)
AC303790
Connector: B-114
<4G6-L.H.D.>
AC
Harness side
B-114 (B)

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-65
•Check the A/C compressor power supply line for
open circuit.
Q: Is the check result normal?
YES :
Go to Step 10.
NO : Repair the wiring harness.
STEP 10. Connector check: C-123 engine-ECU
connector or C-122 engine-A/T-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 11.
YES : Go to Step 12.
NO : Repair the connector.
AC303786
Connector: B-114
<4G1-R.H.D.>
AB
Harness side
B-114 (B)
AC303794
Connector: B-114
<4G6-R.H.D.>
AB
Harness side
B-114 (B)
AC303805
Connectors: C-122 , C-123

C-122 (GR)
C-123 (Y)
C-122 Harness side
C-123
AE
AC303817
Connectors: C-122 , C-123
AF

C-122C-122 (GR)
C-123 (Y)
C-123 Harness side

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-66
STEP 11. Check the wiring harness between
C-123 engine-ECU connector terminal No.8 and
B-17X A/C compressor relay connector terminal
No.3.
•Check the A/C compressor relay earth line for
open circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction P.00-5).
NO : Repair the wiring harness.
STEP 12. Check the wiring harness between
C-122 engine A/T-ECU connector terminal No.20
and B-17X A/C compressor relay connector
terminal No.3.
•Check the A/C compressor relay earth line for
open or short circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction P.00-5).
NO : Repair the wiring harness.
AC304988AB
Connector: B-17X
Front of
vehicle
1
3 2
4
Relay box side
AC303804
Connector: C-123

AH
Harness side
C-123 (Y)
AC303816
Connector: C-123
AM

Harness side
C-123 (Y)
AC304988AB
Connector: B-17X
Front of
vehicle
1
3 2
4
Relay box side
AC303804
Connector: C-122

AG
Harness side
C-122 (GR)
AC303816
Connector: C-122
AL

Harness side
C-122 (GR)

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-67
CHECK AT ECU TERMINAL M1552010300527
12
345
678
9 10111213141516
AC300861AC

Terminal No. Check item Checking requirement Normal condition
1 Rear defogger switch Defogger switch: ON 0 V
Defogger switch: OFF System voltage
2 Inside/outside air selection
damper motor (outside air)When the damper is moved to
the inside air recirculation
position0 V
When the damper is moved to
the outside air inside air intake
positionSystem voltage
3 Inside/outside air selection
damper motor (inside air)When the damper is moved to
the inside air recirculation
positionSystem voltage
When the damper is moved to
the outside air inside air intake
position0 V
4 Output to the engine-A/T-ECU
(A/C1)A/C stopped 0 V
•A/C switch: ON
•Blower switch: ONSystem voltage
5 Output to the engine-A/T-ECU
(A/C2)When the A/C is under low load System voltage
When the A/C is under high
load0 V
6 Power supply to the A/C
illuminationLighting switch: ON System voltage
7---
8 Blower switch (lo) blower switch: lo System voltage
9---
10 Power supply to the ignition
switch (IG2)Ignition switch: ON System voltage
11 Earth to the A/C illumination Always 0 V
12 Earth Always 0 V
13 Air thermo sensor (outlet side) Sensor probe temperature 25°C
(1.5k ohm)2.2 V
14, 15 - - -
16 Earth to the air thermo sensor Always 0 V

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-68
CHECK AT ECU TERMINAL M1552010300538
21
78
6 534
11
10912
AC304990
AB

Terminal No. Check item Checking requirement Normal condition
1 Output to the engine-A/T-ECU
(A/C1)A/C stopped 0 V
•A/C switch: ON
•Blower switch: ONSystem voltage
2 Output to the engine-A/T-ECU
(A/C2)When the A/C is under low load System voltage
When the A/C is under high
load0 V
3 Earth Always 0 V
4 Earth to the air thermo sensor Always 0 V
5 Power supply to the A/C
illuminationLighting switch: ON System voltage
6 Air thermo sensor (outlet side) Sensor probe temperature 25°C
(1.5k ohm)2.2 V
7 Power supply to the ignition
switch (IG2)Ignition switch: ON System voltage
8 Blower switch (lo) blower switch: lo System voltage
9 Rear defogger switch Defogger switch: ON 0 V
Defogger switch: OFF System voltage
10 Inside/outside air selection
damper motor (outside air)When the damper is moved to
the inside air recirculation
position0 V
When the damper is moved to
the outside air inside air intake
positionSystem voltage
11 Inside/outside air selection
damper motor (inside air)When the damper is moved to
the inside air recirculation
positionSystem voltage
When the damper is moved to
the outside air inside air intake
position0 V
12 Earth to the A/C illumination Always 0 V

ON-VEHICLE SERVICE
HEATER, AIR CONDITIONER AND VENTILATION55-69
ON-VEHICLE SERVICE
SIGHT GLASS REFRIGERANT LEVEL
TEST
M1552008400378
1. Start the engine.
2. Operate the air-conditioner, and then set the
temperature to maximum cooling.
3. Hold the engine speed at 1500 r/min.
4. Check the refrigerant level (bubble state) through
the sight glass.
CAUTION
Use the low-pressure service valve.
NOTE: Use the refrigerant recovery station to
charge the specified refrigerant because you can
not calculate the amount of the refrigerant
properly with the sight glass.
MAGNETIC CLUTCH TESTM1552008500405
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
M1552001000335
<1300, 1600>
Refer to GROUP 11A, On-vehicle Service − Drive
Belt Tension Check P.11A-7.
<2000>
Refer to GROUP 11C, On-vehicle Service − Drive
Belt Tension Check P.11C-7.
DUAL PRESSURE SWITCH CHECKM1552010400320
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
P.55-98, P.55-99.)
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. Items State
Insufficient Many bubbles are seen.
If refrigerant is extremely
low, it appears white.
Sufficient or excess
refrigerantNo bubbles are seen.
AC005963
Bubbles Insufficient
refrigerantSufficient or excess
refrigerant
AC
AC005671
Magnetic clutch connector
AC
AC001368AD High/Low
Pressure Side
Low-pressure side
High-pressure side
ON
OFFON
OFF
2650 ± 200 2060 ± 200230 ± 20 210 ± 25
(kPa)

ON-VEHICLE SERVICE
HEATER, AIR CONDITIONER AND VENTILATION55-70
CHARGING M1552001200362
1. With the handles turned back all the way (valve
closed), install the adaptor valve to the
low-pressure side of the gauge manifold.
2. Connect the charging hose (blue) to the adaptor
valve.
3. Connect the quick joint (for low-pressure) to the
charging hose (blue).
CAUTION
•Use tools that are suited to R134a.
•To install the quick joint, press section when
connecting, run your hand along the hose
while pressing to ensure that there are no
bends in the hose.
4. Connect the quick joint (for low-pressure) to the
low- pressure service valve.
NOTE: The low-pressure service valve should be
connected to the flexible suction hose.5. Close the high and low-pressure valves of the
gauge manifold.
CAUTION
Be sure to connect the power plug of the vacuum
pump to the vacuum pump adapter, and then
connect the power plug of the adapter to a 100-V
outlet.
6. Install the vacuum pump adaptor to the vacuum
pump.
7. Connect the charging hose (yellow) to the R-134a
connection port of the vacuum pump adaptor.
8. Tighten the adaptor valve handle (valve open).
9. Open the low-pressure valve of the gauge
manifold.
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
(6).
CAUTION
Do not operate the compressor for evacuation.
11.Turn the vacuum pump adaptor switch to the
R134a side to start the vacuum pump.
12.Evacuate to a vacuum reading of 100 kPa or
higher (takes approx. 10 minutes).
AC212526
AB
A
Sleeve Low-pressure
service valve Quick
joint
(for low
pressure)
SwitchVacuum
pump
Power supply
plug Vacuum
pump
adaptor R-12
connection
portCharging hose
(blue)
Adapter
valveCharging hose
(yellow)Gauge manifold
Switch
R-134a
connection
port Low-pressure
valveHigh-pressure
valve
AC212535
Vacuum
pump Low-pressure
service valve
AB
Vacuum pump
adaptor switch

ON-VEHICLE SERVICE
HEATER, AIR CONDITIONER AND VENTILATION55-71
CAUTION
Do not operate the compressor in the vacuum
condition; damage may occur.
13.Loosen the valve of the adapter valve fully (valve
closed), and turn off the vacuum pump adapter
switch. Then leave it for five minutes.
14.Check the system for proper sealing (negative
pressure should not decrease).
15.Connect the service can valve to the service can
with the handle loosened fully (valve closed).
16.Turn the handle of the adaptor valve back all the
way (valve closed), remove it from the gauge
manifold and install the service can.
17.Tighten the handle of the charging valve (valve
closed) to puncture the service can.
CAUTION
If the service can is inverted, liquid refrigerant
may be drawn into the compressor damaging it
by liquid compression. Keep the service can
upright to ensure that refrigerant is charged in
gas state.
18.Turn the handle of the charging valve back (valve
open) and tighten the handle of the adaptor valve
(valve open) to charge the system with refrigerant.
19.If the refrigerant is not drawn in, turn the handle of
the adaptor valve back all the way (valve closed).
20.Check for gas leaks using a leak detector. If a gas
leak is detected, re-tighten the connections, and
then repeat the charging procedure from
evacuation in step (11).
CAUTION
The leak detector for R-134a should be used.
21.Start the engine.
22.Operate the A/C and set to the lowest
temperature (MAX. COOL).
23.Fix the engine speed at 1,500 r/min.
CAUTION
If the service can is inverted, liquid refrigerant
may be drawn into the compressor damaging it
by liquid compression. Keep the service can
upright to ensure that refrigerant is charged in
gas state.
24.Tighten the handle of the adaptor valve (valve
open) to charge the required volume of
refrigerant.
AC212536
Valve open
Valve close
Charging valve
Service can Adaptor valve
AB
AC212537
Charging valve
Service can
(Refrigerant container)
Low-pressure
service valve
AB