Page 3305 of 3833

AIR CONDITIONER CONTROL
ATC-29
C
D
E
F
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K
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MA
B
AT C
FAN SPEED CONTROL
Blower speed is automatically controlled based on temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and air mix door position.
With FAN switch set to AUTO, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
INTAKE DOOR CONTROL
The intake doors are automatically controlled by: The temperature setting, ambient temperature, in-vehicle
temperature, intake temperature, amount of sunload and ON-OFF operation of the compressor.
OUTLET DOOR CONTROL
The outlet door is automatically controlled by: The temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature and amount of sunload.
MAGNET CLUTCH CONTROL
The ECM controls compressor operation using input signals from the throttle position sensor and auto ampli-
fier.
SELF-DIAGNOSTIC SYSTEM
The self-diagnostic system is built into the auto amplifier (LCU) to quickly locate the cause of malfunctions.
Overview of Control systemEJS000TK
The control system consists of input sensors, switches, the automatic amplifier (microcomputer) and outputs.
The relationship of these components is shown in the diagram below:
RJIA1942E
Page 3306 of 3833

ATC-30
AIR CONDITIONER CONTROL
Control Operation
EJS000TL
DISPLAY SCREEN
Displays the operational status of the system.
AUTO SWITCH
The compressor, intake doors, air mix doors, outlet doors and blower speed are automatically controlled so
that the in-vehicle temperature will reach, and be maintained at the set temperature selected by the operator.
TEMPERATURE DIAL (POTENTIO TEMPERATURE CONTROL)
Increase or decrease the set temperature.
Ambient temperature will be displayed by pressing the temperature dial. Display should show the outside
(ambient) temperature for approximately 5 seconds.
A/C SWITCH
The compressor is ON or OFF.
(Pressing the A/C switch when the AUTO switch is ON will turn off the A/C switch and compressor.)
DEFROSTER (DEF) SWITCH
Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position.
MODE SWITCH
Control the air discharge outlets.
FAN SWITCH
Manually controls the blower speed. Five speeds are available for manual control (as shown on the display
screen).
OFF SWITCH
The compressor and blower are OFF, the intake doors are set to the outside air position, and the air outlet
doors are set to the foot position.
FRESH (FRE) SWITCH
OFF position: Interior air is recirculated inside the vehicle.
ON position: Outside air is drawn into the passenger compartment.
(When RECIRCULATION switch is ON, the FRESH switch turns OFF automatically.)
RECIRCULATION (REC) SWITCH
OFF position: Outside air is drawn into the passenger compartment.
ON position: Interior air is drawn into the passenger compartment.
(When the FRESH switch is ON or the compressor is turned from ON to OFF, the RECIRCULATION switch
turns OFF automatically.)
RJIA1943E
Page 3307 of 3833
AIR CONDITIONER CONTROL
ATC-31
C
D
E
F
G
H
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K
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MA
B
AT C
Discharge Air FlowEJS000TM
RJIA0483E
Page 3308 of 3833
ATC-32
AIR CONDITIONER CONTROL
System Description
EJS000TN
SWITCHES AND THEIR CONTROL FUNCTION
RJIA0484E
RJIA0485E
Page 3309 of 3833

TROUBLE DIAGNOSIS
ATC-33
C
D
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F
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H
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MA
B
AT C
TROUBLE DIAGNOSISPFP:00004
How to Perform Trouble Diagnoses for Quick and Accurate RepairEJS001GS
WORK FLOW
SYMPTOM TABLE
*1AT C - 5 4 , "Operational Check"
SHA900E
Symptom Reference Page
A/C system does not come on. Go to Trouble Diagnosis Procedure for A/C system.ATC-57, "
Power
Supply and
Ground Circuit for
Auto Amp."
Air outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door Motor. (LAN)AT C - 6 2 , "Mode
Door Motor Cir-
cuit"Mode door motor does not operate normally.
Discharge air temperature does not change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor. (LAN)ATC-64, "
Air Mix
Door Motor Cir-
cuit"Air mix door motor does not operate nor-
mally.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor.(LAN)AT C - 6 8 , "
Intake
Door Motor Cir-
cuit"Intake door motor does not operate normally.
Blower motor operation is malfunctioning.
Go to Trouble Diagnosis Procedure for Blower Motor.ATC-70, "
Blower
Motor Circuit"Blower motor operation is malfunctioning
under out of starting fan speed control.
Magnet clutch does not engage. Go to Trouble Diagnosis Procedure for Magnet Clutch.AT C - 7 8 , "
Magnet
Clutch Circuit"
Insufficient cooling. Go to Trouble Diagnosis Procedure for Insufficient Cooling.AT C - 8 6 , "Insuffi-
cient Cooling"
Insufficient heating. Go to Trouble Diagnosis Procedure for Insufficient Heating.AT C - 9 5 , "Insuffi-
cient Heating"
Noise. Go to Trouble Diagnosis Procedure for Noise.ATC-97, "Noise"
Self-diagnosis cannot be performed. Go to Trouble Diagnosis Procedure for Self-diagnosis.AT C - 9 8 , "Self-
diagnosis"
Memory function does not operate. Go to Trouble Diagnosis Procedure for Memory Function.AT C - 9 9 , "Memory
Function"
Page 3310 of 3833
ATC-34
TROUBLE DIAGNOSIS
Component Parts and Harness Connector Location
EJS001GT
ENGINE COMPARTMENT
RJIA0677E
Page 3311 of 3833
TROUBLE DIAGNOSIS
ATC-35
C
D
E
F
G
H
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K
L
MA
B
AT C
PASSENGER COMPARTMENT
RJIA0487E
Page 3312 of 3833
ATC-36
TROUBLE DIAGNOSIS
Circuit Diagram
EJS001GU
WITH GASOLINE ENGINE
TJWA0001E