Infiniti F50. Manual — part 119
ATC-1
AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
CONTENTS
C
D
E
F
G
H
I
K
L
M
SECTION
A
B
ATC
AUTOMATIC AIR CONDITIONER
PRECAUTIONS . . . . . . . . . . . . . . .. 4
CONTAMINATED REFRIGERANT . . . . . ... 5
Precautions for Leak Detection Dye . . . . . ... 12
IDENTIFICATION . . . . . . . . . . . . 12
IDENTIFICATION LABEL FOR VEHICLE . . ... 12
Wiring Diagrams and Trouble Diagnosis . . . . 12
PREPARATION . . . . . . . . . . . . . . . 13
Special Service Tools . . . . . . . . . . . . 13
HFC-134a (R-134a) Service Tools and Equipment
Commercial Service Tool . . . . . . . . . ... 16
REFRIGERATION SYSTEM . . . . . . . . . . 17
Refrigerant Cycle . . . . . . . . . . . . ... 17
REFRIGERANT FLOW . . . . . . . . . ... 17
FREEZE PROTECTION . . . . . . . . . . 17
Refrigerant System Protection . . . . . . . ... 17
REFRIGERANT PRESSURE SENSOR . . . . 17
PRESSURE RELIEF VALVE . . . . . . . ... 17
V-6 Variable Displacement Compressor . . . . . 18
GENERAL INFORMATION . . . . . . . . . 18
DESCRIPTION . . . . . . . . . . . . . 19
Component Layout . . . . . . . . . . . . . 22
LUBRICANT . . . . . . . . . . . . . . . .. 23
Maintenance of Lubricant Quantity in Compressor ... 23
AIR CONDITIONER CONTROL . . . . . . . ... 26
Description of Control System . . . . . . . . 30
Control Operation . . . . . . . . . . . . ... 31
ATC-2
DUAL SWITCH . . . . . . . . . . . . . 32
SWITCHES AND THEIR CONTROL FUNCTION ... 34
TROUBLE DIAGNOSIS . . . . . . . . . . . 35
How to Perform Trouble Diagnoses for Quick and
Accurate Repair . . . . . . . . . . . . . .. 35
WORK FLOW . . . . . . . . . . . . . .. 35
SYMPTOM TABLE . . . . . . . . . . . .. 35
Component Parts and Harness Connector Location ... 36
ENGINE COMPARTMENT . . . . . . . . .. 36
PASSENGER COMPARTMENT . . . . . . .. 37
Self-diagnosis Function . . . . . . . . . . .. 53
Operational Check . . . . . . . . . . . . .. 62
Power Supply and Ground Circuit for Auto Amp. ... 65
LAN System Circuit . . . . . . . . . . . . 67
DIAGNOSTIC PROCEDURE FOR LAN CIR-
CUIT . . . . . . . . . . . . . . . . . 67
Mode Door Motor Circuit . . . . . . . . . . 71
Air Mix Door Motor Circuit . . . . . . . . . .. 74
Air Mix Door Motor PBR Circuit . . . . . . . .. 76
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR PBR . . . . . . . . . . ... 76
Intake Door Motor Circuit . . . . . . . . . . 77
DIAGNOSTIC PROCEDURE FOR INTAKE
DOOR MOTOR . . . . . . . . . . . . . 79
Rear Ventilator Door Motor . . . . . . . . . .79
Rear control switch . . . . . . . . . . . . .80
DIAGNOSTIC PROCEDURE FOR REAR CON-
TROL SWITCH . . . . . . . . . . . . . 80
Blower Motor Circuit . . . . . . . . . . . . 81
Magnet Clutch Circuit . . . . . . . . . . . ..86
Insufficient Cooling . . . . . . . . . . . . ..92
Insufficient Heating . . . . . . . . . . . ...100
INSPECTION FLOW . . . . . . . . . . ..100
Noise . . . . . . . . . . . . . . . . . .101
INSPECTION FLOW . . . . . . . . . . ..101
Self-diagnosis . . . . . . . . . . . . . ...102
INSPECTION FLOW . . . . . . . . . . ..102
Memory Function . . . . . . . . . . . . ..103
INSPECTION FLOW . . . . . . . . . . ..103
ECON (ECONOMY) Mode . . . . . . . . . 104
INSPECTION FLOW . . . . . . . . . . ..104
In-Vehicle Sensor Circuit . . . . . . . . . ... 110
ATC-3
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Intake Sensor Circuit . . . . . . . . . . . .116
Multiplex Communication Circuit . . . . . . ...118
CONTROL UNIT . . . . . . . . . . . . . . 123
Removal and Installation . . . . . . . . . .. 123
REMOVAL . . . . . . . . . . . . . . . 123
INSTALLATION . . . . . . . . . . . . . 123
AMBIENT SENSOR . . . . . . . . . . . . 124
Removal and Installation . . . . . . . . . .. 124
REMOVAL . . . . . . . . . . . . . . . 124
INSTALLATION . . . . . . . . . . . . . 124
IN-VEHICLE SENSOR . . . . . . . . . . . 125
Removal and Installation . . . . . . . . . .. 125
REMOVAL . . . . . . . . . . . . . . . 125
INSTALLATION . . . . . . . . . . . . . 125
SUNLOAD SENSOR . . . . . . . . . . . .. 126
Removal and Installation . . . . . . . . . .. 126
REMOVAL . . . . . . . . . . . . . . . 126
INSTALLATION . . . . . . . . . . . . . 126
INTAKE SENSOR . . . . . . . . . . . . ... 127
Removal and Installation . . . . . . . . . .. 127
REMOVAL . . . . . . . . . . . . . . . 127
INSTALLATION . . . . . . . . . . . . . 127
BLOWER UNIT . . . . . . . . . . . . . ... 128
Removal and Installation . . . . . . . . . .. 128
REMOVAL . . . . . . . . . . . . . . . 128
INSTALLATION . . . . . . . . . . . . . 128
Disassembly and Assembly . . . . . . . . . 129
BLOWER MOTOR . . . . . . . . . . . . .. 130
Removal and Installation . . . . . . . . . .. 130
REMOVAL . . . . . . . . . . . . . . . 130
INSTALLATION . . . . . . . . . . . . . 130
INTAKE DOOR MOTOR . . . . . . . . . . . 131
Removal and Installation . . . . . . . . . .. 131
REMOVAL . . . . . . . . . . . . . . . 131
INSTALLATION . . . . . . . . . . . . . 131
IN-CABIN MICROFILTER . . . . . . . . . ... 132
Removal and Installation . . . . . . . . . .. 132
HEATER & COOLING UNIT ASSEMBLY . . . .. 133
Removal and Installation . . . . . . . . . .. 133
REMOVAL . . . . . . . . . . . . . . . 133
INSTALLATION . . . . . . . . . . . . . 134
Disassembly and Assembly . . . . . . . . . 135
MODE DOOR MOTOR . . . . . . . . . . ... 136
Removal and Installation . . . . . . . . . .. 136
REMOVAL . . . . . . . . . . . . . . . 136
INSTALLATION . . . . . . . . . . . . . 136
AIR MIX DOOR MOTOR . . . . . . . . . . . 137
Removal and Installation . . . . . . . . . .. 137
REMOVAL . . . . . . . . . . . . . . . 137
INSTALLATION . . . . . . . . . . . . . 137
DUCTS AND GRILLES . . . . . . . . . . ... 138
Removal and Installation . . . . . . . . . .. 138
REMOVAL . . . . . . . . . . . . . . . 138
INSTALLATION . . . . . . . . . . . . . 140
REFRIGERANT LINES . . . . . . . . . . ... 141
HFC-134a (R-134a) Service Procedure . . . ... 141
SETTING OF SERVICE TOOLS AND EQUIP-
MENT . . . . . . . . . . . . . . . . 141
Components . . . . . . . . . . . . . . . 143
Compressor . . . . . . . . . . . . . . .. 144
REMOVAL . . . . . . . . . . . . . . . 144
INSTALLATION . . . . . . . . . . . . . 144
Compressor Clutch . . . . . . . . . . . ... 145
REMOVAL . . . . . . . . . . . . . . . 145
INSTALLATION . . . . . . . . . . . . . 147
Low-Pressure Flexible Hose . . . . . . . . . 148
REMOVAL . . . . . . . . . . . . . . . 148
INSTALLATION . . . . . . . . . . . . . 148
High-Pressure Flexible Hose . . . . . . . . 149
REMOVAL . . . . . . . . . . . . . . . 149
INSTALLATION . . . . . . . . . . . . . 149
High-Pressure Pipe . . . . . . . . . . . .. 149
REMOVAL . . . . . . . . . . . . . . . 149
INSTALLATION . . . . . . . . . . . . . 150
Refrigerant Pressure Sensor . . . . . . . . 150
REMOVAL . . . . . . . . . . . . . . . 150
INSTALLATION . . . . . . . . . . . . . 150
Condenser . . . . . . . . . . . . . . . 151
REMOVAL . . . . . . . . . . . . . . . 151
INSTALLATION . . . . . . . . . . . . . 152
Liquid Tank . . . . . . . . . . . . . . ... 152
REMOVAL . . . . . . . . . . . . . . . 153
INSTALLATION . . . . . . . . . . . . . 153
Evaporator . . . . . . . . . . . . . . . 153
REMOVAL . . . . . . . . . . . . . . . 153
INSTALLATION . . . . . . . . . . . . . 154
Expansion Valve . . . . . . . . . . . . ... 154
REMOVAL . . . . . . . . . . . . . . . 154
INSTALLATION . . . . . . . . . . . . . 154
ATC-4
PRECAUTIONS
PRECAUTIONS
PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EJS0022V
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. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:
●
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.
●
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.
●
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)
EJS0008R
WARNING:
●
CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
are mixed and compressor malfunction is likely to occur, refer to “CONTAMINATED REFRIGER-
ANT” below. To determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use
Refrigerant Recovery/Recycling Recharging equipment (ACR4) (J-39500-INF) and Refrigerant
Identifier.
●
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.
●
The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol-
lowing handling precautions must be observed:
–
When removing refrigerant components from a vehicle, immediately cap (seal) the component to
minimize the entry of moisture from the atmosphere.
–
When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just
before connecting the components. Connect all refrigerant loop components as quickly as possi-
ble to minimize the entry of moisture into system.
–
Only use the specified lubricant from a sealed container. Immediately reseal containers of lubri-
cant. Without proper sealing, lubricant will become moisture saturated and should not be used.
–
Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from the A/C system, using certified service equipment meet-
ing requirements of SAE J2210 HFC-134a (R-134a) recycling equipment, or J2209 HFC-134a (R-
134a) recovery equipment. If accidental system discharge occurs, ventilate work area before
resuming service. Additional health and safety information may be obtained from refrigerant and
lubricant manufacturers.
–
Do not allow lubricant (Nissan A/C System Oil Type S) to come in contact with styrofoam parts.
Damage may result.
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