HEATER &
AIR CONDITIONER
SECTION
HA
CONTENTS
PRECAUTIONS AND PREPARATION............................2
Supplemental Restraint System (SRS) ″AIR
BAG″ and ″SEAT BELT PRE-TENSIONER″...............2
Precautions for Working with HFC-134a (R-134a) .....2
General Refrigerant Precautions.................................3
Precautions for Refrigerant Connection ......................3
Precautions for Servicing Compressor........................6
Special Service Tools ..................................................7
HFC-134a (R-134a) Service Tools and
Equipment....................................................................8
Precautions for Service Equipment...........................10
DESCRIPTION...............................................................12
Refrigeration Cycle ....................................................12
V-6 Variable Displacement Compressor....................13
Component Layout ....................................................16
Air Conditioner LAN System......................................17
Automatic Temperature Control (ATC) System .........19
Overview of Control System......................................20
Control Operation ......................................................20
Discharge Air Flow.....................................................22
TROUBLE DIAGNOSES ...............................................24
How to Perform Trouble Diagnoses for Quick
and Accurate Repair..................................................24
Operational Check.....................................................25
Symptom Chart..........................................................28
Self-diagnosis ............................................................29
Preliminary Check......................................................36
Performance Test Diagnoses ....................................44
Performance Chart ....................................................46
Trouble Diagnoses for Abnormal Pressure ...............47
Component Location..................................................50
Circuit Diagram..........................................................52
Wiring Diagram - A/C - ..............................................53
Auto Amp. Terminals and Reference Value...............58
Main Power Supply and Ground Circuit Check ........61
Self-diagnosis Circuit.................................................63
Ambient Sensor Circuit..............................................64
In-vehicle Sensor Circuit............................................67
Intake Sensor Circuit .................................................70
Sunload Sensor Circuit..............................................71
Mode Door Motor Circuit (LAN).................................74
Air Mix Door Motor Circuit (LAN) ..............................76
Bi-level Door Motor Circuit (LAN)..............................78
LAN System Circuit ...................................................80
Intake Door Motor Circuit ..........................................83
Blower Motor Circuit ..................................................87
Magnet Clutch Circuit ................................................92
Rear Vent Door Motor Circuit....................................96
Control Linkage Adjustment.......................................97
SERVICE PROCEDURES .............................................99
HFC-134a (R-134a) Service Procedure....................99
Maintenance of Lubricant Quantity in
Compressor .............................................................102
Refrigerant Lines .....................................................104
Checking Refrigerant Leaks ....................................105
Compressor Mounting .............................................108
Belt Tension .............................................................108
Fast Idle Control Device (FICD)..............................108
Compressor .............................................................108
Compressor Clutch..................................................109
Ventilation Air Filter..................................................111
SERVICE DATA AND SPECIFICATIONS (SDS) ........113
General Specifications.............................................113
Inspection and Adjustment ......................................113
When you read wiring diagrams:
I Read GI section, “HOW TO READ WIRING DIAGRAMS”.
I See EL section, “POWER SUPPLY ROUTING” for power distribution circuit.
When you perform trouble diagnoses, read GI section, “HOW TO FOLLOW FLOW
CHART IN TROUBLE DIAGNOSES” and “HOW TO PERFORM EFFICIENT DIAGNOSIS
FOR AN ELECTRICAL INCIDENT”.
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
EL
IDX
EXIT
EXIT
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