1999 MITSUBISHI LANCER EVOLUTION VI relay

REAR AXLE – Sensor Relay / AYC-ECU27-42
INSPECTION
1. LONGITUDINAL AND LATERAL ACCELERATION
SENSOR CHECK
Refer to GROUP 35B – Acceleration Sensor.
2. AYC RELAY CONTINUITY CHECK
Battery voltageTerminal No.
1345
When not energized
When energized
AYC-ECU
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operation

Front Floor Console Removal and Installation
5 Nm
AYC-ECU
5 Nm

CHASSIS ELECTRICAL – Ignition Switch and Immobilizer System54-18
Inspection Procedure 4
Malfunction of the immobilizer-ECU power supply and earth circuit
Measure at the immobilizer-ECU con-
nector B-100.

Disconnect the connector and
measure at the harness side.
(1) Voltage between 2 and body earth
(Ignition switch: ON)
OK: System voltage
(2) Voltage between 1 and body earth
OK: System voltage
(3) Continuity between 8 and body earth
OK: Continuity(1) NGCheck the following connectors:
B-76, B-74, B-100NG
Repair
OK
Check trouble symptoms.
NG
Check the fuse and the harness wire
between the ignition switch (IG) and
immobilizer-ECU.NG
OK
Check trouble symptoms.NGCheck the ignition switch.
(Refer to P.54-20.)
(2) NG
Check the following connectors:
B-65, B-100NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
immobilizer-ECU and the engine control
relay, and repair if necessary.
(3) NG
Check the following connectors.
B-50, B-100NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
immobilizer-ECU and body earth, and
repair if necessary. Repair
CHECK AT IMMOBILIZER-ECU
TERMINAL VOLTAGE CHECK CHART
Terminal No.SignalChecking requirementsTerminal voltage
1Immobilizer-ECU power supplyIgnition switch: ONSystem voltage
2Ignition switch-IGIgnition switch: OFF0V
Ignition switch: ONSystem voltage
8Immobilizer-ECU earthAlways0V

CHASSIS ELECTRICAL – Headlamp54-38
HEADLAMP RELAY CONTINUITYCHECK
Battery voltageTerminal No.
1345
Not supplied
Supplied
Headlamp relay

CHASSIS ELECTRICAL – Antenna / Rear Window Defogger54-50
REMOVAL SERVICE POINT
AANTENNA AMPLIFIER ASSEMBLY REMOVAL
Take off the left-hand edge of the hand lining and undo the
clips of the antenna amplifier assembly.
REAR WINDOW DEFOGGER
TROUBLESHOOTING WITH AUTOMATIC A/C>
Refer to GROUP 55.
ON-VEHICLE SERVICE
PRINTED-HEATER CHECK
1. Run engine at 2,000 r/min. Check heater element with
battery at full.
2. Turn ON rear window defogger switch. Measure heater
element voltage with circuit tester at rear window glass
centre A.
Condition is good if it indicates about 6V.
3. If 12 V is indicated at A, there is a break in the negative
terminals from A.
Move test bar slowly to negative terminal to detect where
voltage changes suddenly (0V).
4. If 0 V is indicated at A, there is a break in the positive
terminals from A. Defect where the voltage changes
suddenly (12 V) in the same method described above.
DEFOGGER RELAY CONTINUITY CHECK
Battery voltageTerminal No.Battery voltage1325
Power is not supplied
Power is supplied
Normal characteristic curve
Voltage
A (Centre point)
approx. 6 V
Positive
terminal
Printed heater lineNegative
terminal
Abnormal characteristic curve
Voltage
Open-circuit
point
Positive
terminal
Printed heater lineNegative
terminal
Junction block
Defogger relay

55-1
HEATER,
AIR CONDITIONER
AND VENTILATION
CONTENTS
HEATER AND MANUAL AIR
CONDITIONER 3. . . . . . . . . . . . . . . . . . . . . .
GENERAL 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outline of Change 3. . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS 3. . . . . . . . . . . . . .
LUBRICANTS 3. . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS 3. . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 4. . . . . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE 6. . . . . . . . . . . . . . . . . .
Refrigerant Charging 6. . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Charging Amount Check 9. . . . . . . .
Replenishing System 10. . . . . . . . . . . . . . . . . . . . .
Discharging System 11. . . . . . . . . . . . . . . . . . . . . .
Performance Test 11. . . . . . . . . . . . . . . . . . . . . . . .
Dual Pressure Switch Simple Check 13. . . . . . .
Power Relay Check 13. . . . . . . . . . . . . . . . . . . . . .
Idle-up Operation Check 14. . . . . . . . . . . . . . . . . .
HEATER CONTROL ASSEMBLY AND A/C
SWITCH 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HEATER UNIT AND BLOWER UNIT
AIR CONDITIONER> 18. . . . . . . . . . . . . . . . . . .
HEATER UNIT, COOLING AND BLOWER
UNIT CONDITIONER> 19. . . . . . . . . . . . . . . . . . . . . . .
BLOWER MOTOR ASSEMBLY, RESISTOR
AND EVAPORATOR 20. . . . . . . . . . . . . . . . . . .
COMPRESSOR AND TENSION
PULLEY 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONDENSER AND CONDENSER FAN 28. .
REFRIGERANT LINE 30. . . . . . . . . . . . . . . . . .
DUCTS 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONTINUED ON NEXT PAGE

55-2
FULL-AUTOMATIC AIR
CONDITIONER 33. . . . . . . . . . . . . . . . . . . . .
GENERAL 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outline of Change 33. . . . . . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS 33. . . . . . . . . . . .
LUBRICANTS 33. . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS 33. . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 34. . . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE 56. . . . . . . . . . . . . . . .
Refrigerant Charging, Level Check, Addition
and Removal, Performance Test, Dual
Pressure Switch Simple Check 56. . . . . . . . . . . .
Power Relay Check 57. . . . . . . . . . . . . . . . . . . . . .
Idle-up Operation Check 57. . . . . . . . . . . . . . . . . .
DAMPER CONTROL MOTOR ASSEMBLY
AND POWER TRANSISTOR 58. . . . . . . . . . . .
PHOTO SENSOR 61. . . . . . . . . . . . . . . . . . . . . .
OUTSIDE AIR TEMPERATURE
SENSOR 62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HEATER WATER TEMPERATURE
SENSOR 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OTHER MAINTENANCE SERVICE
POINTS 64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

HEATER AND MANUAL AIR CONDITIONER – Troubleshooting55-4
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 checked1.
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.
Fuse111
Harness, connector2212
Amount of refrigerant31
A/C compressor relay4
A/C compressor magnet
clutch5
Dual pressure switch623
A/C switch7
Blower switch832
Blower relay4
Resistor53
Blower motor6
Air thermo-sensor93
Condenser fan relay44
Condenser fan motor55
Radiator fan relay (HI, LO)66
Radiator fan motor77
Refrigerant temperature
switch108
Auto compressor control
unit119
Engine-ECU12108

HEATER AND MANUAL AIR CONDITIONER – Troubleshooting55-5
No.Trouble symp-
tomProblem causeRemedyRefer-
ence
page
1When the igni-
tion switch is
“ON”, the A/C
does not oper
Refrigerant leak or overfilling of refriger-
antReplenish the refrigerant, repair the
leak or take out some of the
refrigerant55-6
does not oper-
ate.A/C compressor relay is defectiveReplace the A/C compressor relay55-14ate.
A/C compressor magnetic clutch is
defectiveReplace the A/C compressor magnet
clutch55-26
Dual pressure switch is defectiveReplace the dual pressure switch55-13
A/C switch is defectiveReplace the A/C switch55-17
Blower switch is defectiveReplace the blower switch55-17
Air thermo-sensor is defectiveReplace the air thermo-sensor55-22
Refrigerant temperature switch is defec-
tiveReplace the refrigerant temperature
switch55-25
Automatic compressor-ECU is defectiveReplace the automatic compressor-
ECU–
2When the A/C is
operating, tem-
perat re inside
Refrigerant leakReplenish the refrigerant and repair
the leak55-6
perature inside
the
passengerDual pressure switch is defectiveReplace the dual pressure switch55-13the passenger
compartment
doesn’tde-Air thermo-sensor is defectiveReplace the air thermo-sensor–doesnt de-
crease (cool air
is not emitted)
Condenser fan relay is defectiveReplace the condenser fan relay55-14
is not emitted).Condenser fan motor is defectiveReplace the condenser fan motor55-29
Radiator fan relay (HI, LO) is defectiveReplace the radiator fan relay (HI, LO)55-14
Radiator fan motor is defectiveReplace the radiator fan motor–
Refrigerant temperature switch is defec-
tiveReplace the refrigerant temperature
switch55-25
Automatic compressor-ECU is defectiveReplace the automatic compressor-
ECU–
3Blower fan mo-
tor doesn’t turn
Blower switch is defectiveReplace the blower switch55-17
tor doesn’t turn.Blower relay is defectiveReplace the blower relay55-13
Resistor is defectiveReplace the resistor55-21
Blower fan motor is defectiveReplace the blower fan motor55-21
4Blower fan mo-
tor doesn’t stop
t rning
Defective harness between the blower
fan motor and the blower switchRepair the harness–
turning.Blower switch is defectiveReplace the blower switch55-17
Resistor is defectiveReplace the resistor55-21
5When the A/C is
operating con
Condenser fan relay is defectiveReplace the condenser fan relay55-14
operating con-
denser fan orCondenser fan motor is defectiveReplace the condenser fan motor55-29denser an or
radiator fan
does not runRadiator fan relay (HI, LO) is defectiveReplace the radiator fan relay (HI, LO)55-14does not run.
Radiator fan motor is defectiveReplace the radiator fan motor–
Dual pressure switch is defectiveReplace the dual pressure switch55-13
Engine-ECU is defectiveReplace the engine-ECU–