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AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
A
SECTION
AUTOMATIC AIR CONDITIONER
ATC B
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 4
. LUBRICANT ............................................................. 24
. F
Precautions for Supplemental Restraint System Maintenance of Lubricant Quantity in Compressor.. 24 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- LUBRICANT ....................................................... 24.
SIONER" ................................................................. 4
. CHECKING AND ADJUSTING ........................... 24 . G
Precautions for Working with HFC-134a (R-134a).... 4 . AIR CONDITIONER CONTROL .............................. 26 .
Contaminated Refrigerant ....................................... 4 . Description ............................................................. 26
.
General Refrigerant Precautions ............................. 5 . Operation ............................................................... 26
.
H
Precautions for Refrigerant Connection .................. 5 . AIR MIX DOORS CONTROL ............................. 26 .
ABOUT ONE-TOUCH JOINT ............................... 5 . BLOWER SPEED CONTROL ............................ 26 .
FEATURES OF NEW TYPE REFRIGERANT INTAKE DOOR CONTROL ................................ 26 .
CONNECTION ..................................................... 7. MODE DOOR CONTROL .................................. 26 . I
O-RING AND REFRIGERANT CONNECTION..... 9 DEFROSTER DOOR CONTROL ....................... 26 .
Precautions for Servicing Compressor .................. 12 . MAGNET CLUTCH CONTROL .......................... 27 .
Precautions for Service Equipment ....................... 12 . SELF-DIAGNOSTIC SYSTEM ........................... 27 . ATC
RECOVERY/RECYCLING EQUIPMENT ........... 12 . Description of Control System ............................... 28 .
ELECTRONIC LEAK DETECTOR ..................... 12 . Control Operation .................................................. 28
.
VACUUM PUMP ................................................ 13 . DISPLAY SCREEN ............................................. 29 .
K
MANIFOLD GAUGE SET ................................... 13 . AUTO SWITCH .................................................. 29 .
SERVICE HOSES .............................................. 13 . TEMPERATURE CONTROL DIAL (TEMPERA-
SERVICE COUPLERS ....................................... 14 . TURE CONTROL) (DRIVER SIDE) .................... 29 .
REFRIGERANT WEIGHT SCALE ..................... 14 . TEMPERATURE CONTROL DIAL (TEMPERA- L
CALIBRATING ACR4 WEIGHT SCALE ............. 14 . TURE CONTROL) (PASSENGER SIDE) ........... 29 .
CHARGING CYLINDER ..................................... 14 . TEMPERATURE CONTROL DIAL (TEMPERA-
Precautions for Leak Detection Dye ...................... 14 . TURE AND MODE CONTROL) (REAR) ............ 29 . M
IDENTIFICATION ............................................... 15 . RECIRCULATION (REC) SWITCH .................... 29 .
IDENTIFICATION LABEL FOR VEHICLE .......... 15 . DEFROSTER (DEF) SWITCH ............................ 29 .
Wiring Diagrams and Trouble Diagnosis ............... 15 . REAR WINDOW DEFOGGER SWITCH ............ 29 .
PREPARATION ........................................................ 16
. OFF SWITCH ..................................................... 29 .
Special Service Tools ............................................ 16
. A/C SWITCH ...................................................... 29.
HFC-134a (R-134a) Service Tools and Equipment.. 16 . MODE SWITCH (FRONT) .................................. 29 .
Commercial Service Tools ..................................... 19 . FRONT BLOWER CONTROL DIAL ................... 29 .
REFRIGERATION SYSTEM .................................... 20 . MODE SWITCH (REAR) .................................... 29 .
Refrigerant Cycle .................................................. 20
. Discharge Air Flow ................................................ 30.
REFRIGERANT FLOW ...................................... 20 . FRONT ............................................................... 30
.
FREEZE PROTECTION .................................... 20 . System Description ................................................ 31.
Refrigerant System Protection .............................. 20 . SWITCHES AND THEIR CONTROL FUNCTION 31 ...
REFRIGERANT PRESSURE SENSOR ............ 20 . CAN Communication System Description ............. 32 .
PRESSURE RELIEF VALVE .............................. 21 . TROUBLE DIAGNOSIS ........................................... 33 .
Components .......................................................... 22
. CONSULT-II Function (BCM) ................................ 33 .
REFRIGERATION SYSTEM .............................. 22 . CONSULT-II BASIC OPERATION ...................... 33 .
ATC-1
DATA MONITOR ................................................. 34 . Magnet Clutch Circuit .............................................87 .
How to Perform Trouble Diagnosis for Quick and INSPECTION FLOW ...........................................87 .
Accurate Repair ..................................................... 35 . SYSTEM DESCRIPTION ....................................88 .
WORK FLOW ..................................................... 35 . DIAGNOSTIC PROCEDURE FOR MAGNET
SYMPTOM TABLE ............................................. 35 . CLUTCH .............................................................88 .
ComponentParts and Harness Connector Location 36 ... COMPONENT INSPECTION ..............................92 .
ENGINE COMPARTMENT ................................. 36 . Insufficient Cooling .................................................93 .
FRONT PASSENGER COMPARTMENT ........... 37 . INSPECTION FLOW ...........................................93 .
Schematic --LHD MODELS-- .............................. 38 . PERFORMANCE TEST DIAGNOSES ...............94 .
Wiring Diagram --A/C-- --LHD MODELS-- ........ 39 . PERFORMANCE CHART ...................................96 .
Schematic --RHD MODELS-- .............................. 46 . TROUBLE DIAGNOSES FOR UNUSUAL PRES-
Wiring Diadram --A/C-- --RHD MODELS-- ........ 47 . SURE ..................................................................97
.
Front Air Control Terminals and Reference Value... 53 Insufficient Heating .............................................. 100 .
PIN CONNECTOR TERMINAL LAYOUT ........... 53 . INSPECTION FLOW ......................................... 100 .
TERMINALS AND REFERENCE VALUE FOR Noise .................................................................... 101
.
FRONT AIR CONTROL ...................................... 53 . INSPECTION FLOW ......................................... 101 .
A/C System Self-diagnosis Function ..................... 55 . Self-diagnosis ...................................................... 103.
DESCRIPTION ................................................... 55 . INSPECTION FLOW ......................................... 103 .
Operational Check ................................................. 57 . Memory Function ................................................. 104 .
CHECKING MEMORY FUNCTION .................... 57 . INSPECTION FLOW ......................................... 104 .
CHECKING BLOWER ........................................ 57 . Ambient Sensor Circuit ........................................ 105 .
CHECKING DISCHARGE AIR ........................... 58 . COMPONENT DESCRIPTION ......................... 105 .
CHECKING RECIRCULATION ........................... 58 . AMBIENT TEMPERATURE INPUT PROCESS.105
CHECKING TEMPERATURE DECREASE ........ 58 . DIAGNOSTIC PROCEDURE FOR AMBIENT
CHECKING TEMPERATURE INCREASE ......... 59 . SENSOR ........................................................... 105 .
CHECK A/C SWITCH ......................................... 59 . COMPONENT INSPECTION ............................ 107 .
CHECKING AUTO MODE .................................. 59 . In-vehicle Sensor Circuit ...................................... 108 .
Power Supply and Ground Circuit for Front Air Con- COMPONENT DESCRIPTION ......................... 108 .
trol .......................................................................... 60
. DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
INSPECTION FLOW .......................................... 60 . SENSOR ........................................................... 109 .
COMPONENT DESCRIPTION ........................... 61 . COMPONENT INSPECTION ............................ 111 .
DIAGNOSTIC PROCEDURE FORA/C SYSTEM 61 ... Optical Sensor Circuit .......................................... 112 .
Mode Door Motor Circuit ....................................... 63 . COMPONENT DESCRIPTION ......................... 112 .
INSPECTION FLOW .......................................... 63 . OPTICAL INPUT PROCESS ............................ 112 .
SYSTEM DESCRIPTION ................................... 64 . DIAGNOSTIC PROCEDURE FOR SUNLOAD
COMPONENT DESCRIPTION ........................... 65 . SENSOR ........................................................... 112 .
DIAGNOSTIC PROCEDURE FOR MODE Intake Sensor Circuit ............................................ 114 .
DOOR MOTOR .................................................. 65 . COMPONENT DESCRIPTION ......................... 114 .
Air Mix Door Motor Circuit ..................................... 68 . DIAGNOSTICPROCEDUREFORINTAKESEN-
INSPECTION FLOW .......................................... 68 . SOR .................................................................. 114
.
SYSTEM DESCRIPTION ................................... 69 . COMPONENT INSPECTION ............................ 115 .
COMPONENT DESCRIPTION ........................... 70 . CONTROL UNIT ..................................................... 116 .
DIAGNOSTIC PROCEDURE FOR AIR MIX Removal and Installation ...................................... 116 .
DOOR MOTOR (DRIVER) .................................. 71 . REMOVAL ......................................................... 116 .
DIAGNOSTIC PROCEDURE FOR AIR MIX INSTALLATION ................................................. 116 .
DOOR MOTOR (PASSENGER) ......................... 73 . AMBIENT SENSOR ............................................... 117 .
Intake Door Motor Circuit ....................................... 77 . Removal and Installation ...................................... 117 .
INSPECTION FLOW .......................................... 77 . REMOVAL ......................................................... 117 .
SYSTEM DESCRIPTION ................................... 78 . INSTALLATION ................................................. 117 .
COMPONENT DESCRIPTION ........................... 79 . IN-VEHICLE SENSOR ........................................... 118 .
DIAGNOSTIC PROCEDURE FOR INTAKE Removal and Installation ...................................... 118 .
DOOR MOTOR .................................................. 79 . REMOVAL ......................................................... 118 .
Blower Motor Circuit .............................................. 80 . INSTALLATION ................................................. 118 .
INSPECTION FLOW .......................................... 80 . OPTICAL SENSOR ................................................ 119 .
SYSTEM DESCRIPTION ................................... 81 . Removal and Installation ...................................... 119 .
COMPONENT DESCRIPTION ........................... 82 . INTAKE SENSOR ................................................... 120 .
DIAGNOSTIC PROCEDURE FOR BLOWER Removal and Installation ...................................... 120 .
MOTOR .............................................................. 82 . REMOVAL ......................................................... 120 .
COMPONENT INSPECTION ............................. 86 . INSTALLATION ................................................. 120 .
ATC-2
BLOWER MOTOR ................................................. 121 . REFRIGERANT LINES .......................................... 138 .
Components ........................................................ 121
. HFC-134a (R-134a) Service Procedure .............. 138 . A
Removal and Installation ..................................... 121. SETTING OF SERVICE TOOLS AND EQUIP-
REMOVAL ........................................................ 121
. MENT ............................................................... 138
.
INSTALLATION ................................................ 121. Components ........................................................ 140 . B
AIR CONDITIONER FILTER .................................. 122 . Removal and Installation for Compressor ........... 142 .
Removal and Installation ..................................... 122. REMOVAL ........................................................ 142 .
FUNCTION ....................................................... 122
. INSTALLATION ................................................ 142 .
REPLACEMENT TIMING ................................. 122 . Removal and Installation for Compressor Clutch . 143 C
REPLACEMENT PROCEDURE ...................... 122 . REMOVAL ........................................................ 143 .
HEATER & COOLING UNIT ASSEMBLY ............. 124 . INSPECTION ................................................... 144 .
Components ........................................................ 124
. INSTALLATION ................................................ 144 . D
Removal and Installation ..................................... 126. BREAK-IN OPERATION ................................... 146 .
REMOVAL ........................................................ 126
. Removal andInstallation for High-pressure Flexible
INSTALLATION ................................................ 126. A/C Hose ............................................................. 146
. E
HEATER CORE ..................................................... 127
. REMOVAL ........................................................ 146 .
Components ........................................................ 127
. INSTALLATION ................................................ 146 .
Removal and Installation ..................................... 127. Removal and Installation for High-pressure A/C
REMOVAL ........................................................ 127
. Pipe ..................................................................... 146
. F
INSTALLATION ................................................ 127. REMOVAL ........................................................ 146 .
HEATER PUMP ..................................................... 128
. INSTALLATION ................................................ 146 .
Components ........................................................ 128
. Removal and Installation for Low-pressure Flexible G
Removal and Installation ..................................... 128. A/C Hose ............................................................. 146
.
REMOVAL ........................................................ 128
. REMOVAL ........................................................ 146 .
INSTALLATION ................................................ 128. INSTALLATION ................................................ 146 . H
INTAKE DOOR MOTOR ........................................ 129 . RemovalandInstallationforLow-pressureA/CPipe 147 .
Components ........................................................ 129
. REMOVAL ........................................................ 147 .
Removal and Installation ..................................... 129. INSTALLATION ................................................ 147 .
I
REMOVAL ........................................................ 129
. Removal and Installation for Refrigerant Pressure
INSTALLATION ................................................ 129. Sensor ................................................................. 147
.
MODE DOOR MOTOR .......................................... 130 . REMOVAL ........................................................ 147 .
Components ........................................................ 130
. INSTALLATION ................................................ 147 . ATC
Removal and Installation ..................................... 130. Removal and Installation for Condenser ............. 147 .
REMOVAL ........................................................ 130
. REMOVAL ........................................................ 147 .
INSTALLATION ................................................ 130. INSTALLATION ................................................ 148 . K
AIR MIX DOOR MOTOR ........................................ 131 . Removal and Installation for Evaporator ............. 149 .
Components ........................................................ 131
. REMOVAL ........................................................ 149 .
Removal and Installation ..................................... 131. INSTALLATION ................................................ 149 . L
AIR MIX DOOR MOTOR (DRIVER) ................. 131 . Removal and Installation for Expansion Valve ..... 150 .
AIR MIX DOOR MOTOR (PASSENGER) ........ 131 . REMOVAL ........................................................ 150 .
VARIABLE BLOWER CONTROL ......................... 133 . INSTALLATION ................................................ 150 .
Components ........................................................ 133
. Checking for Refrigerant Leaks ........................... 150 . M
Removal and Installation ..................................... 133. Checking System for Leaks Using the Fluorescent
REMOVAL ........................................................ 133
. Leak Detector ...................................................... 150 .
INSTALLATION ................................................ 133. Dye Injection ........................................................ 151
.
DUCTS AND GRILLES ......................................... 134 . Electronic Refrigerant Leak Detector ................... 151 .
Components ........................................................ 134
. PRECAUTIONS FOR HANDLING LEAK
Removal and Installation ..................................... 136. DETECTOR ...................................................... 151 .
CONSOLE DUCTS AND CONSOLE GRILLE . 136 CHECKING PROCEDURE .............................. 152 .
DEFROSTER NOZZLE .................................... 136 . SERVICE DATA AND SPECIFICATIONS (SDS) ... 154 .
RH AND LH SIDE DEMISTER DUCT .............. 136 . Service Data and Specifications (SDS) ............... 154 .
RH AND LH VENTILATOR DUCT .................... 136 . COMPRESSOR ............................................... 154 .
CENTER VENTILATOR DUCT ........................ 136 . LUBRICANT ..................................................... 154 .
FLOOR CONNECTOR DUCT .......................... 136 . REFRIGERANT ................................................ 154 .
FRONT AND REAR FLOOR DUCTS .............. 137 . ENGINE IDLING SPEED ................................. 154 .
REAR OVERHEAD DUCTS ............................. 137 . BELT TENSION ................................................ 154 .
SIDE REAR FLOOR DUCT ............................. 137 .
GRILLES .......................................................... 137
.
ATC-3
PRECAUTIONS
PRECAUTIONS PFP:00001
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS006AK
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:
q To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Working with HFC-134a (R-134a) EJS006AL
WARNING:
q CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. These refrigerants
must never be mixed, even in the smallest amounts. If the refrigerants are mixed and compressor
malfunction is likely occur.
q Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) compo-
nents. If lubricant other than that specified is used, compressor malfunction is likely to occur.
q The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol-
lowing handling precautions must be observed:
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