Infiniti M45 (Y34). Manual — part 129
ATC-1
AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
CONTENTS
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SECTION
ATC
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ATC
AUTOMATIC AIR CONDITIONER
PRECAUTIONS . . . . . . . . . . . . . . .. 4
CONTAMINATED REFRIGERANT . . . . . ... 4
Precautions for Leak Detection Dye . . . . . . 11
IDENTIFICATION . . . . . . . . . . . . .11
IDENTIFICATION LABEL FOR VEHICLE . . . 11
Wiring Diagrams and Trouble Diagnosis . . . . .11
PREPARATION . . . . . . . . . . . . . . . 12
Special Service Tools . . . . . . . . . . . . 12
HFC-134a (R-134a) Service Tools and Equipment
Commercial Service Tools . . . . . . . . . .. 15
REFRIGERATION SYSTEM . . . . . . . . . . 16
Refrigerant Cycle . . . . . . . . . . . . ... 16
REFRIGERANT FLOW . . . . . . . . . ... 16
FREEZE PROTECTION . . . . . . . . . . 16
Refrigerant System Protection . . . . . . . ... 16
REFRIGERANT PRESSURE SENSOR . . . . 16
PRESSURE RELIEF VALVE . . . . . . . ... 16
V-6 Variable Displacement Compressor . . . . . 17
GENERAL INFORMATION . . . . . . . . . 17
DESCRIPTION . . . . . . . . . . . . . 18
Component Layout . . . . . . . . . . . . . 21
LUBRICANT . . . . . . . . . . . . . . . .. 22
Maintenance of Lubricant Quantity in Compressor ... 22
AIR CONDITIONER CONTROL . . . . . . . ... 25
Description of Control System . . . . . . . . 29
Control Operation . . . . . . . . . . . . ... 30
ATC-2
DUAL SWITCH . . . . . . . . . . . . . 31
SWITCHES AND THEIR CONTROL FUNCTION ... 33
TROUBLE DIAGNOSIS . . . . . . . . . . . 34
How to Perform Trouble Diagnosis for Quick and
Accurate Repair . . . . . . . . . . . . . .. 34
WORK FLOW . . . . . . . . . . . . . .. 34
SYMPTOM TABLE . . . . . . . . . . . .. 34
Component Parts and Harness Connector Location ... 35
ENGINE COMPARTMENT . . . . . . . . .. 35
PASSENGER COMPARTMENT . . . . . . .. 36
Self-Diagnosis Function . . . . . . . . . . .. 49
Operational Check . . . . . . . . . . . . .. 57
Power Supply and Ground Circuit for Auto Amp. ... 60
LAN System Circuit . . . . . . . . . . . . 62
DIAGNOSTIC PROCEDURE FOR LAN CIR-
CUIT . . . . . . . . . . . . . . . . . 62
Mode Door Motor Circuit . . . . . . . . . . 66
Air Mix Door Motor Circuit . . . . . . . . . .. 69
Air Mix Door Motor PBR Circuit . . . . . . . .. 71
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR PBR . . . . . . . . . . ... 71
Intake Door Motor Circuit . . . . . . . . . . 72
DIAGNOSTIC PROCEDURE FOR INTAKE
DOOR MOTOR . . . . . . . . . . . . . 74
Blower Motor Circuit . . . . . . . . . . . . 75
Magnet Clutch Circuit . . . . . . . . . . . ..80
Insufficient Cooling . . . . . . . . . . . . ..87
Insufficient Heating . . . . . . . . . . . . .96
INSPECTION FLOW . . . . . . . . . . . 96
Noise . . . . . . . . . . . . . . . . . ...97
INSPECTION FLOW . . . . . . . . . . . 97
Self-Diagnosis . . . . . . . . . . . . . . .98
INSPECTION FLOW . . . . . . . . . . . 98
Memory Function . . . . . . . . . . . . . 99
INSPECTION FLOW . . . . . . . . . . . 99
ECON (ECONOMY) Mode . . . . . . . . . 100
INSPECTION FLOW . . . . . . . . . . ..100
Ambient Sensor Circuit . . . . . . . . . . .101
In-Vehicle Sensor Circuit . . . . . . . . . ...103
Sunload Sensor Circuit . . . . . . . . . . .106
Intake Sensor Circuit . . . . . . . . . . . .109
Multiplex Communication Circuit . . . . . . ... 111
DIAGNOSTIC PROCEDURE FOR MULTIPLEX
COMMUNICATION CIRCUIT . . . . . . . 111
ATC-3
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ATC
CONTROL UNIT . . . . . . . . . . . . . ..114
Removal and Installation . . . . . . . . . ...114
REMOVAL . . . . . . . . . . . . . . ..114
INSTALLATION . . . . . . . . . . . . ..114
AMBIENT SENSOR . . . . . . . . . . . . .115
Removal and Installation . . . . . . . . . ...115
REMOVAL . . . . . . . . . . . . . . ..115
INSTALLATION . . . . . . . . . . . . ..115
IN-VEHICLE SENSOR . . . . . . . . . . . .116
Removal and Installation . . . . . . . . . ...116
REMOVAL . . . . . . . . . . . . . . ..116
INSTALLATION . . . . . . . . . . . . ..116
SUNLOAD SENSOR . . . . . . . . . . . ...117
Removal and Installation . . . . . . . . . ...117
REMOVAL . . . . . . . . . . . . . . ..117
INSTALLATION . . . . . . . . . . . . ..117
INTAKE SENSOR . . . . . . . . . . . . . 118
Removal and Installation . . . . . . . . . ...118
REMOVAL . . . . . . . . . . . . . . ..118
INSTALLATION . . . . . . . . . . . . ..118
BLOWER UNIT . . . . . . . . . . . . . . 119
Removal and Installation . . . . . . . . . ...119
REMOVAL . . . . . . . . . . . . . . ..119
INSTALLATION . . . . . . . . . . . . ..119
Disassembly and Assembly . . . . . . . . ..119
BLOWER MOTOR . . . . . . . . . . . . .. 121
Removal and Installation . . . . . . . . . .. 121
REMOVAL . . . . . . . . . . . . . . . 121
INSTALLATION . . . . . . . . . . . . . 121
INTAKE DOOR MOTOR . . . . . . . . . . . 122
Removal and Installation . . . . . . . . . .. 122
REMOVAL . . . . . . . . . . . . . . . 122
INSTALLATION . . . . . . . . . . . . . 122
IN-CABIN MICROFILTER . . . . . . . . . ... 123
Removal and Installation . . . . . . . . . .. 123
HEATER & COOLING UNIT ASSEMBLY . . . .. 124
Removal and Installation . . . . . . . . . .. 124
REMOVAL . . . . . . . . . . . . . . . 124
INSTALLATION . . . . . . . . . . . . . 125
Disassembly and Assembly . . . . . . . . . 126
HEATER CORE . . . . . . . . . . . . . .. 128
Removal and Installation . . . . . . . . . .. 128
REMOVAL . . . . . . . . . . . . . . . 128
INSTALLATION . . . . . . . . . . . . . 128
MODE DOOR MOTOR . . . . . . . . . . ... 129
Removal and Installation . . . . . . . . . .. 129
REMOVAL . . . . . . . . . . . . . . . 129
INSTALLATION . . . . . . . . . . . . . 129
AIR MIX DOOR MOTOR . . . . . . . . . . . 130
Removal and Installation . . . . . . . . . .. 130
REMOVAL . . . . . . . . . . . . . . . 130
INSTALLATION . . . . . . . . . . . . . 130
DUCTS AND GRILLES . . . . . . . . . . ... 131
Removal and Installation . . . . . . . . . .. 131
REMOVAL . . . . . . . . . . . . . . . 131
INSTALLATION . . . . . . . . . . . . . 133
REFRIGERANT LINES . . . . . . . . . . ... 134
HFC-134a (R-134a) Service Procedure . . . ... 134
SETTING OF SERVICE TOOLS AND EQUIP-
MENT . . . . . . . . . . . . . . . . 134
Components . . . . . . . . . . . . . . . 136
Removal and Installation of Compressor . . . .. 137
REMOVAL . . . . . . . . . . . . . . . 137
INSTALLATION . . . . . . . . . . . . . 137
Removal and Installation of Compressor Clutch .. 138
REMOVAL . . . . . . . . . . . . . . . 138
INSTALLATION . . . . . . . . . . . . . 140
Removal and Installation of Low-Pressure Flexible
Hose . . . . . . . . . . . . . . . . . . 141
REMOVAL . . . . . . . . . . . . . . . 141
INSTALLATION . . . . . . . . . . . . . 142
Removal and Installation of High-Pressure Flexible
Hose . . . . . . . . . . . . . . . . . . 142
REMOVAL . . . . . . . . . . . . . . . 142
INSTALLATION . . . . . . . . . . . . . 142
Removal and Installation of High-Pressure Pipe .. 143
REMOVAL . . . . . . . . . . . . . . . 143
INSTALLATION . . . . . . . . . . . . . 143
Removal and Installation of Refrigerant Pressure
Sensor . . . . . . . . . . . . . . . . .. 143
REMOVAL . . . . . . . . . . . . . . . 143
INSTALLATION . . . . . . . . . . . . . 143
Removal and installation of Condenser . . . . 144
REMOVAL . . . . . . . . . . . . . . . 144
INSTALLATION . . . . . . . . . . . . . 144
Removal and Installation of Liquid Tank . . . ... 145
REMOVAL . . . . . . . . . . . . . . . 145
INSTALLATION . . . . . . . . . . . . . 145
Removal and Installation of Evaporator . . . . 146
REMOVAL . . . . . . . . . . . . . . . 146
INSTALLATION . . . . . . . . . . . . . 146
Removal and Installation of Expansion Valve . ... 146
REMOVAL . . . . . . . . . . . . . . . 146
INSTALLATION . . . . . . . . . . . . . 147
ATC-4
PRECAUTIONS
PRECAUTIONS
PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
AJS00115
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.
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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)
AJS0006S
WARNING:
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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 and Refrigerant Identifier.
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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 J-2210 HFC-134a (R-134a) recycling equipment, or J-2209 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.
CONTAMINATED REFRIGERANT
If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are:
●
Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant
into the atmosphere.
●
Explain that recovery of the contaminated refrigerant could damage your service equipment and refriger-
ant supply.
●
Suggest the customer return the vehicle to the location of previous service where the contamination may
have occurred.
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