1999 MITSUBISHI LANCER EVOLUTION VI sensor

FULL-AUTOMATIC AIR CONDITIONER – Troubleshooting55-44
Inspection procedure 3
A/C graphic display on control panel is blank.
Probable cause
The cause is probably a malfunction of the A/C-ECU power supply system
(earth).
Malfunction of connector or harness

Malfunction of A/C-ECU
Does the A/C operate?NOInspection procedure 15 (Refer to P.55-52.)
YES
Replace the A/C-ECU.
Inspection procedure 4
Temperature cannot be set.
Probable cause
The cause is probably a malfunction of the temperature setting signal input
system or output system.
Malfunction of connector or harness

Malfunction of A/C-ECU
Inspection procedure 15 (Refer to P.55-52.)
Inspection procedure 5
A/C outlet air temperature does not increase.
Probable cause
If the outlet air temperature does not increase when the temperature setting is
increased, the cause is probably a sensor malfunction or a problem with
operation of the air mix damper. The MUT-II can be used to check the
diagnosis codes in order to check the cause of the problem for each separate
system.
Malfunction of air mix damper potentiometer

Malfunction of air mix damper motor

Malfunction of air mix damper

Malfunction of connector or harness

Malfunction of thermostat

Malfunction of A/C-ECU
MUT-II Self-Diag code
Is any of the codes 11, 12, 31 and 41 output?YESINSPECTION CHART FOR DIAGNOSIS CODES (Refer to
P.55-34.)
NO
Thermostat checkNG
Replace
OK
Replace the A/C-ECU.
Inspection procedure 6
A/C outlet air temperature does not decrease.
Probable cause
If the outlet air temperature does not decrease when the temperature setting is
decreased, the cause is probably a problem in A/C system operation due to a
sensor error, or a problem with operation of the air mix damper. The MUT-II
can be used to check the diagnosis codes in order to check the cause of the
problem for each separate system.
Malfunction of outside air temperature sensor

Malfunction of air mix damper potentiometer

Malfunction of air mix damper motor

Malfunction of air thermo sensor

Malfunction of connector or harness

Malfunction of air mix damper

Malfunction of A/C-ECU
Does the A/C operate?NOInspection procedure 2 (Refer to P.55-43.)
YES
MUT-II Self-Diag code
Is any of the codes 11, 12, 13, 14, 21, 22, 31 and 41 output?YESINSPECTION CHART FOR DIAGNOSIS CODES (Refer to
P.55-34.)
NO
Replace the A/C-ECU.

FULL-AUTOMATIC AIR CONDITIONER – Troubleshooting55-54
DATA LIST REFERENCE TABLE
Check itemCheck conditionNormal condition
Inside air temperature sensor

MUT-II (11)Ignition switch: ONInside air temperature and temper-
ature displayed on the MUT-II are
identical.
Outside air temperature sen-
sor

MUT-II (13)Ignition switch: ONOutside air temperature and tem-
perature displayed on the MUT-II
are identical.
Heater water temperature
sensor

MUT-II (15)Ignition switch: ONHeater core surface temperature
and temperature displayed on the
MUT-II are identical.
Air thermo sensor

MUT-II (21)Ignition switch: ONEvaporator surface temperature
and temperature displayed on the
MUT-II are identical.
Photo sensor

MUT-II (25)Ignition switch: ONAmount of incident light is propor-
tional to voltage displayed on the
MUT-II.
Air mix damper potentiometer

MUTII(31)
Ignition switch: ONDamper positionOpening degree (%)

MUT-II (31)MAX. HOTApprox. 100
MAX. COOLApprox. 0
Air outlet changeover damper
potentiometer
Ignition switch: ONDamper positionOpening degree (%)
potentiometer

MUT-II (32)FACEApprox. 0
FOOTApprox. 50
FOOT/DEF.Approx. 75
DEF.Approx. 100
CHECK AT THE A/C-ECU TERMINALS
A/C-ECU
The parenthesized values in “Normal condition” column are for your reference.
Terminal
No.
Check itemCheck conditionNormal condition
1Front power transistor collector outputWhen blower switch is at OFFSystem voltage
When blower switch is at LOApprox. 7 V
When blower switch is at HIAlmost no voltage (0 V)
2Front power transistor base outputWhen blower switch is at OFF0 V
When blower switch is at LOApprox. 1.3 V
When blower switch is at HIApprox. 2.5 V
3BackupAt all timesSystem voltage

FULL-AUTOMATIC AIR CONDITIONER – Troubleshooting55-55
Terminal
No.Normal condition Check condition Check item
4Heater water temperature sensor
inputWhen sensor section temperature is
25C (4 kΩ)2.3 – 2.9 V
5Air mix damper potentiometer inputWhen damper is moved to MAX. HOT
position4.7 – 5.0 V
6Air outlet changeover damper poten-
tiometer inputWhen damper is moved to DEF.
position4.8 – 5.2 V
7Outside air temperature sensor inputWhen sensor section temperature is
25C (4 kΩ)2.3 – 2.9 V
8Air thermo sensor inputWhen sensor section temperature is
25C (4 kΩ)2.3 – 2.9 V
9Photo sensor (–)At luminous intensity of 0 lux0 V
At luminous intensity of 100,000 lux or
more–0.1 – 0.2 V
10Sensor power supplyAt all times4.8 – 5.2 V
12Blower motor HI relay (Exciting circuit)When blower switch is in HI1.5 V or less
When blower switch is in a position
other than HISystem voltage
16Rear defoggerWhen rear defogger switch is ON1.5 V or less
When rear defogger switch is OFFSystem voltage
17Diagnosis date outputWhen ignition switch is ON0 V ↔ 12 V
18Diagnosis control outputWhen ignition switch is ONSystem voltage – 2 V
19Photo sensor (+)At all times0 V
20Sensor earthAt all times0 V
21Air outlet changeover damper motor
(FACE)When damper is moved to FACE
position10 V
When damper is moved to DEF.
positionAlmost no voltage
(0.5 V)
22Air mix damper motor (MAX. COOL)When damper is moved to MAX.
COOL position10 V
When damper is moved to MAX. HOT
positionAlmost no voltage
(0.5 V)
23Inside/outside air changeover damper
motor (Inside)When switch is set to inside air
positionAlmost no voltage
(0.5 V)
When switch is set to outside air
position10 V
24Air outlet changeover damper motor
(DEF.)When damper is moved to FACE
positionAlmost no voltage
(0.5 V)
When damper is moved to DEF.
position10 V

FULL-AUTOMATIC AIR CONDITIONER – Photo Sensor55-61
PHOTO SENSOR
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operation

Instrument Panel Removal and Installation
1 2
Removal step
1. Defroster nozzle
2. Photo sensor
INSPECTION
If the blower speed drops when the receiver section of the
photo sensor is covered with your hand, then the photo sensor
is normal. If the speed does not drop, replace the photo sensor.

FULL-AUTOMATIC AIR CONDITIONER –
Outside Air Temperature
Sensor55-62
OUTSIDE AIR TEMPERATURE SENSOR
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operation

Radiator Grille Removal and Installation
Outside air temperature sensor
INSPECTION
When the resistance value between the sensor terminals is
measured under two or more temperature conditions, the
resistance value should be close to the values shown in the
graph.
NOTE
The temperature conditions when testing should not exceed
the range of the characteristic curve in the graph.Resistance kΩ
Temperature C 20
15
10
0 5
–10 0 4020 30 10

FULL-AUTOMATIC AIR CONDITIONER –
Heater Water
Temperature Sensor55-63
HEATER WATER TEMPERATURE SENSOR
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operation

Floor Console Removal and Installation

Glove Box Removal and Installation

Foot Duct Removal and Installation
(Refer to P55-31.)
1 2
Removal steps
AA1. Heater water temperature sensor clip
AA2. Heater water temperature sensor
REMOVAL SERVICE POINT
AHEATER WATER TEMPERATURE SENSOR CLIP
AND HEATER WATER TEMPERATURE SENSOR
REMOVAL
Pull out the heater water temperature sensor clip which is
at the bottom of the heater unit, and then remove the heater
water temperature sensor from the heater unit.
INSTALLATION SERVICE POINT
AHEATER WATER TEMPERATURE SENSOR AND
HEATER WATER TEMPERATURE SENSOR CLIP
INSTALLATION
Insert the heater water temperature sensor into its mounting
hole at the bottom of the heater unit, and then fix it by inserting
the heater water temperature sensor clip.
Heater unit
Heater water
temperature
sensor clip

FULL-AUTOMATIC AIR CONDITIONER –
Heater Water Temperature Sensor /
Other Maintenance Service Points55-64
INSPECTION
Follow the same procedure as for the inspection of the outside
temperature sensor. (Refer to P55-62.)
OTHER MAINTENANCE SERVICE POINTS
The following maintenance service points are the same as for the manual A/C.
ItemsReference page
Dual Pressure Switch55-13
Blower Relay, A/C Compressor Relay, Condenser Fan Relay, Radiator Fan Relay55-13, 14
Idle-up System55-14
Heater Unit, Cooling and Blower Unit55-15
Blower Motor Assembly, Evaporator55-19
Compressor, Tension Pulley55-23
Condenser, Condenser Fan55-28
Ducts55-31

C-1
ELECTRICAL
WIRING
(R.H. DRIVE VEHICLES)
CONTENTS
GENERAL 3. . . . . . . . . . . . . . . . . . . . . . . . . .
WIRING HARNESS CONFIGURATION
DIAGRAMS 4. . . . . . . . . . . . . . . . . . . . . . . . .
ENGINE COMPARTMENT 4. . . . . . . . . . . . . . . .
DASH PANEL 8. . . . . . . . . . . . . . . . . . . . . . . . . . .
FLOOR AND ROOF 12. . . . . . . . . . . . . . . . . . .
LUGGAGE COMPARTMENT 14. . . . . . . . . . . .
SINGLE PART INSTALLATION
POSITION 16. . . . . . . . . . . . . . . . . . . . . . . . .
RELAY 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ECU 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SENSOR 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SOLENOID AND SOLENOID VALVE 19. . . .
INSPECTION CONNECTOR 20. . . . . . . . . . . .
FUSIBLE LINK AND FUSE 20. . . . . . . . . . . . .
EARTH CABLE 21. . . . . . . . . . . . . . . . . . . . . . . .
EARTH 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CIRCUIT DIAGRAM 23. . . . . . . . . . . . . . . .
CENTRALIZED JUNCTION 23. . . . . . . . . . . . .
POWER DISTRIBUTION SYSTEM 24. . . . . .
STARTING SYSTEM 29. . . . . . . . . . . . . . . . . . .
IGNITION SYSTEM 30. . . . . . . . . . . . . . . . . . . .
CHARGING SYSTEM 31. . . . . . . . . . . . . . . . . .
MPI SYSTEM 32. . . . . . . . . . . . . . . . . . . . . . . . . .
COOLING SYSTEM 38. . . . . . . . . . . . . . . . . . . .
HEADLAMP 40. . . . . . . . . . . . . . . . . . . . . . . . . . .
TAIL LAMP, POSITION LAMP, LICENCE
PLATE LAMP AND LIGHTING MONITOR
BUZZER 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ROOM LAMP AND LUGGAGE
COMPARTMENT LAMP 45. . . . . . . . . . . . . . . .
IGNITION KEY CYLINDER ILLUMINATION
LAMP 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TURN-SIGNAL LAMP AND
HAZARD WARNING LAMP 48. . . . . . . . . . . . .
CONTINUED ON NEXT PAGE