Air con MITSUBISHI LANCER 2005 Workshop Manual

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-60
COMMENTS ON TROUBLE SYMPTOM
If the power is not supplied to the A/C compressor,
the A/C compressor circuit system may be
defective..
TROUBLESHOOTING HINTS
•Malfunction of the A/C compressor relay
•Damaged the wiring harness or connectors
DIAGNOSIS
STEP 1. Connector check: B-17X A/C
compressor relay connector
Q: Is the check result normal?
YES :
Go to Step 2.
NO : Repair the connector.
STEP 2. Check the A/C compressor relay
continuity.
Refer to P.55-75.
Q: Is the A/C compressor relay in good condition?
YES :
Go to Step 3.
NO : Replace the A/C compressor relay.
STEP 3. Voltage measurement at B-17X A/C
compressor relay connector.
(1) Remove the relay, and measure at the relay box
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 2 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6.
NO : Go to Step 4.
NO : Go to Step 5.
AC304988AB
Connector: B-17X
Front of
vehicle
1
3 2
4
Relay box side
AC304988AB
Connector: B-17X
Front of
vehicle
1
3 2
4
Relay box side
AC301541EU
Connector B-17X
(Relay box side)
Front of
vehicle1
3 2
4

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-61
STEP 4. Check the wiring harness between B-17X
A/C compressor relay connector terminal No.2
and the ignition switch (IG2).
NOTE:
Prior to the wiring harness inspection, check
intermediate connector C-15, joint connector C-35,
junction block connectors C-209 and C-210, and
repair if necessary.
•Check the A/C compressor relay power supply
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.
AC304988AB
Connector: B-17X
Front of
vehicle
1
3 2
4
Relay box side
AC303800
Connector: C-15

AE
C-15 (L)
AC303798
Connector: C-35

AJ
2 1313 12 1421 105 4616 15 17789
19 18 2011
22
C-35 (L)
AC303809
Connectors: C-209, C-210
AF
C-209
C-210
Junction block (front view)
C-209
Harness side
1016
145
12134117 238 9
C-210
Harness side
4 65321

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-62
STEP 5. Check the wiring harness between B-17X
A/C compressor relay connector terminal No.2
and the ignition switch (IG2).
NOTE:
Prior to the wiring harness inspection, check
intermediate connector C-135, joint connector C-35,
junction block connectors C-209 and C-210, and
repair if necessary.
•Check the A/C compressor relay power supply
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.
AC304988AB
Connector: B-17X
Front of
vehicle
1
3 2
4
Relay box side
AC303814
Connector: C-35

AI
C-35(L)
AC303818
Connector: C-135

AH
C-135 (L)
AC303823
Connectors: C-209, C-210
AE
C-210
Junction block (front view)
C-209
C-209
Harness side
1016
145
12134117 238 9
C-210
Harness side
4 65321

TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-63
STEP 6. Voltage measurement at B-17X A/C
compressor relay connector.
(1) Remove the relay, and measure at the junction
block side.
(2) Measure the voltage between terminal 1 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8.
NO : Go to Step 7.
STEP 7. Check the wiring harness between B-17X
A/C compressor relay connector terminal No.1
and the battery.
NOTE:
Prior to the wiring harness inspection, check
intermediate connector A-13 or C-111
, and repair if necessary.
•Check the A/C compressor relay power supply
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.
AC304988AB
Connector: B-17X
Front of
vehicle
1
3 2
4
Relay box side
AC301541EV
Connector B-17X
(Relay box side)
Front of
vehicle1
3 2
4
AC304988AB
Connector: B-17X
Front of
vehicle
1
3 2
4
Relay box side
AC303857
Connector: A-13

AB
A-13 (B)
AC303816
Connector: C-111

AF
615
121179
810234

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)