Infiniti QX4 (R50). Manual — part 450
NEW TERM
NEW ACRONYM /
ABBREVIATION
OLD TERM
Evaporative emission canister
EVAP canister
Canister
Evaporative emission system
EVAP system
Canister control solenoid valve
Exhaust gas recirculation valve
EGR valve
EGR valve
Exhaust gas recirculation control-BPT
valve
EGRC-BPT valve
BPT valve
Exhaust gas recirculation control-solenoid
valve
EGRC-solenoid valve
EGR control solenoid valve
Exhaust gas recirculation temperature
sensor
EGRT sensor
Exhaust gas temperature sensor
EGR temperature sensor
Flash electrically erasable programmable
read only memory
FEEPROM
***
Flash erasable programmable read only
memory
FEPROM
***
Flexible fuel sensor
FFS
***
Flexible fuel system
FF system
***
Fuel pressure regulator
***
Pressure regulator
Fuel pressure regulator control solenoid
valve
***
PRVR control solenoid valve
Fuel tank temperature sensor
FTT sensor
Tank fuel temperature sensor
Fuel trim
FT
***
Heated Oxygen sensor
HO2S
Exhaust gas sensor
Idle air control system
IAC system
Idle speed control
Idle air control valve-air regulator
IACV-air regulator
Air regulator
Idle air control valve-auxiliary air control
valve
IACV-AAC valve
Auxiliary air control (AAC) valve
Idle air control valve-FICD solenoid valve
IACV-FICD solenoid valve
FICD solenoid valve
Idle air control valve-idle up control sole-
noid valve
IACV-idle up control solenoid valve
Idle up control solenoid valve
Idle speed control-FI pot
ISC-FI pot
FI pot
Idle speed control system
ISC system
***
Ignition control
IC
***
Ignition control module
ICM
***
Indirect fuel injection system
IFI system
***
Intake air
IA
Air
Intake air temperature sensor
IAT sensor
Air temperature sensor
Knock
***
Detonation
Knock sensor
KS
Detonation sensor
Malfunction indicator lamp
MIL
Check engine light
Manifold absolute pressure
MAP
***
Manifold absolute pressure sensor
MAPS
***
SAE J1930 TERMINOLOGY LIST
SAE J1930 Terminology List (Cont’d)
GI-52
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NEW ACRONYM /
ABBREVIATION
OLD TERM
Manifold differential pressure
MDP
***
Manifold differential pressure sensor
MDPS
***
Manifold surface temperature
MST
***
Manifold surface temperature sensor
MSTS
***
Manifold vacuum zone
MVZ
***
Manifold vacuum zone sensor
MVZS
***
Mass air flow sensor
MAFS
Air flow meter
Mixture control solenoid valve
MC solenoid valve
Air-fuel ratio control solenoid valve
Multiport fuel injection System
MFI system
Fuel injection control
Neutral position switch
***
Neutral switch
Nonvolatile random access memory
NVRAM
***
On board diagnostic system
OBD system
Self-diagnosis
Open loop
OL
Open loop
Oxidation catalyst
OC
Catalyst
Oxidation catalytic converter system
OC system
***
Oxygen sensor
O2S
Exhaust gas sensor
Park position switch
***
Park switch
Park/neutral position switch
PNP switch
Park/neutral switch
Periodic trap oxidizer system
PTOX system
***
Positive crankcase ventilation
PCV
Positive crankcase ventilation
Positive crankcase ventilation valve
PCV valve
PCV valve
Powertrain control module
PCM
***
Programmable read only memory
PROM
***
Pulsed secondary air injection control
solenoid valve
PAIRC solenoid valve
AIV control solenoid valve
Pulsed secondary air injection system
PAIR system
Air induction valve (AIV) control
Pulsed secondary air injection valve
PAIR valve
Air induction valve
Random access memory
RAM
***
Read only memory
ROM
***
Scan tool
ST
***
Secondary air injection pump
AIR pump
***
Secondary air injection system
AIR system
***
Sequential multiport fuel injection system
SFI system
Sequential fuel injection
Service reminder indicator
SRI
***
Simultaneous multiport fuel injection sys-
tem
***
Simultaneous fuel injection
Smoke puff limiter system
SPL system
***
Supercharger
SC
***
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SAE J1930 TERMINOLOGY LIST
SAE J1930 Terminology List (Cont’d)
GI-53
NEW TERM
NEW ACRONYM /
ABBREVIATION
OLD TERM
Supercharger bypass
SCB
***
System readiness test
SRT
***
Thermal vacuum valve
TVV
Thermal vacuum valve
Three way catalyst
TWC
Catalyst
Three way catalytic converter system
TWC system
***
Three way + oxidation catalyst
TWC + OC
Catalyst
Three way + oxidation catalytic converter
system
TWC + OC system
***
Throttle body
TB
Throttle chamber
SPI body
Throttle body fuel injection system
TBI system
Fuel injection control
Throttle position
TP
Throttle position
Throttle position sensor
TPS
Throttle sensor
Throttle position switch
TP switch
Throttle switch
Torque converter clutch solenoid valve
TCC solenoid valve
Lock-up cancel solenoid
Lock-up solenoid
Transmission control module
TCM
A/T control unit
Turbocharger
TC
Turbocharger
Vehicle speed sensor
VSS
Vehicle speed sensor
Volume air flow sensor
VAFS
Air flow meter
Warm up oxidation catalyst
WU-OC
Catalyst
Warm up oxidation catalytic converter sys-
tem
WU-OC system
***
Warm up three way catalyst
WU-TWC
Catalyst
Warm up three way catalytic converter
system
WU-TWC system
***
Wide open throttle position switch
WOTP switch
Full switch
SAE J1930 TERMINOLOGY LIST
SAE J1930 Terminology List (Cont’d)
GI-54
HEATER &
AIR CONDITIONER
CONTENTS
PRECAUTIONS . . . . . . . . . . . . . . . ...2
Supplemental Restraint System (SRS)
. . . ...2
Precautions for Working with HFC-134a (R-134a) . .2
General Refrigerant Precautions . . . . . . . . .3
Precautions for Leak Detection Dye. . . . . . . 3
Identification. . . . . . . . . . . . . . . . .4
Precautions for Refrigerant Connection . . . . . ..4
Precautions for Servicing Compressor. . . . . . 6
Precautions for Service Equipment . . . . . . . .7
Wiring Diagrams and Trouble Diagnoses. . . . . 9
PREPARATION . . . . . . . . . . . . . . . .10
Special Service Tools . . . . . . . . . . . . 10
HFC-134a (R-134a) Service Tools and
Equipment. . . . . . . . . . . . . . . . .. 11
DESCRIPTION . . . . . . . . . . . . . . . ...14
Refrigeration System . . . . . . . . . . . . .14
V-6 Variable Displacement Compressor. . . . . 15
Component Layout . . . . . . . . . . . . . 19
Introduction . . . . . . . . . . . . . . . . 20
Features. . . . . . . . . . . . . . . . . .20
Overview of Control System. . . . . . . . . ..23
Control Operation . . . . . . . . . . . . . ..23
Discharge Air Flow. . . . . . . . . . . . . .25
System Description. . . . . . . . . . . . . 26
TROUBLE DIAGNOSES. . . . . . . . . . . . 27
Component Location. . . . . . . . . . . . ..27
Circuit Diagram (Without Navigation System). . ...30
Wiring Diagram - A/C, A - (Without Navigation
System). . . . . . . . . . . . . . . . . ..31
Circuit Diagram (With Navigation System). . . . 35
Wiring Diagram - A/C, A - (With Navigation
System). . . . . . . . . . . . . . . . . ..36
Auto Amp. Terminals and Reference Value. . . ...40
Self-diagnosis . . . . . . . . . . . . . . . 44
How to Perform Trouble Diagnoses for Quick
and Accurate Repair . . . . . . . . . . . . ..65
Operational Check . . . . . . . . . . . . . .66
A/C System. . . . . . . . . . . . . . . . 71
Mode Door Motor. . . . . . . . . . . . . ...75
Air Mix Door Motor . . . . . . . . . . . . . 82
Intake Door Motor. . . . . . . . . . . . . ..87
Blower Motor. . . . . . . . . . . . . . . ..95
Magnet Clutch. . . . . . . . . . . . . . ..104
Insufficient Cooling . . . . . . . . . . . . .. 112
Insufficient Heating . . . . . . . . . . . . ..121
Noise. . . . . . . . . . . . . . . . . . 123
Self-diagnosis . . . . . . . . . . . . . . ..124
Memory Function . . . . . . . . . . . . . .126
ECON (ECONOMY) Mode . . . . . . . . . ..128
Ambient Sensor Circuit. . . . . . . . . . . 129
In-vehicle Sensor Circuit. . . . . . . . . . ..132
Sunload Sensor Circuit. . . . . . . . . . . 135
Intake Sensor Circuit . . . . . . . . . . . ...139
Air Mix Door Motor PBR Circuit . . . . . . . ..141
Multiplex Communication Circuit . . . . . . . .142
SERVICE PROCEDURE. . . . . . . . . . . ..144
HFC-134a (R-134a) Service Procedure . . . . ..144
Maintenance of Lubricant Quantity in
Compressor . . . . . . . . . . . . . . . .146
Compressor . . . . . . . . . . . . . . . .149
Compressor Clutch . . . . . . . . . . . . ..150
Refrigerant Lines . . . . . . . . . . . . . .154
Belt. . . . . . . . . . . . . . . . . . ...159
Ventilation Air Filter. . . . . . . . . . . . ..159
SERVICE DATA AND SPECIFICATIONS (SDS) . ...160
Compressor . . . . . . . . . . . . . . . .160
Lubricant . . . . . . . . . . . . . . . . ..160
Refrigerant . . . . . . . . . . . . . . . ...160
Engine Idling Speed (When A/C is ON) . . . . ..160
Belt Tension . . . . . . . . . . . . . . . .160
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
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