Infiniti G20 (P11). Manual — part 417
NEW TERM
NEW ACRONYM /
ABBREVIATION
OLD TERM
Malfunction indicator lamp
MIL
Check engine light
Manifold absolute pressure
MAP
***
Manifold absolute pressure sensor
MAPS
***
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
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
Inhibitor switch
Neutral position 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
***
MA
EM
LC
EC
FE
CL
MT
AT
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
Simultaneous multiport fuel injection sys-
tem
***
Simultaneous fuel injection
Smoke puff limiter system
SPL system
***
Supercharger
SC
***
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
AUTO
PRECAUTIONS . . . . . . . . . . . . . . . ...3
Supplemental Restraint System (SRS)
. . . ...3
Precautions for Working with HFC-134a (R-134a) . .3
General Refrigerant Precautions . . . . . . . . .4
Precautions for Leak Detection Dye. . . . . . . 4
Identification. . . . . . . . . . . . . . . . .5
Precautions for Refrigerant Connection . . . . . ..5
Precautions for Servicing Compressor. . . . . . 7
Precautions for Service Equipment . . . . . . . .7
Wiring Diagrams and Trouble Diagnosis. . . . . .9
PREPARATION . . . . . . . . . . . . . . . .10
Special Service Tools . . . . . . . . . . . . 10
HFC-134a (R-134a) Service Tools and
Equipment. . . . . . . . . . . . . . . . .. 11
DESCRIPTION . . . . . . . . . . . . . . . ...14
Refrigeration System . . . . . . . . . . . . .14
Component Layout . . . . . . . . . . . . . 15
Introduction . . . . . . . . . . . . . . . . 16
Features. . . . . . . . . . . . . . . . . .16
Overview of Control System. . . . . . . . . ..19
Control Operation . . . . . . . . . . . . . ..19
Discharge Air Flow. . . . . . . . . . . . . .21
TROUBLE DIAGNOSES. . . . . . . . . . . . 23
Component Location. . . . . . . . . . . . ..23
Circuit Diagram . . . . . . . . . . . . . . ..25
Wiring Diagram - A/C, A - . . . . . . . . . . ..26
Auto Amp. Terminals and Reference Value. . . ...29
Self-diagnosis . . . . . . . . . . . . . . . 31
How to Perform Trouble Diagnoses for Quick
and Accurate Repair . . . . . . . . . . . . ..41
Operational Check . . . . . . . . . . . . . .42
A/C System. . . . . . . . . . . . . . . . 45
Mode Door Motor. . . . . . . . . . . . . ...48
Air Mix Door Motor . . . . . . . . . . . . . 54
Intake Door Motor. . . . . . . . . . . . . ..58
Blower Motor. . . . . . . . . . . . . . . ..65
Magnet Clutch. . . . . . . . . . . . . . . 73
Insufficient Cooling . . . . . . . . . . . . . 80
Insufficient Heating . . . . . . . . . . . . . 88
Noise. . . . . . . . . . . . . . . . . . ..89
Self-diagnosis . . . . . . . . . . . . . . . 90
Memory Function . . . . . . . . . . . . . ...91
ECON (ECONOMY) Mode . . . . . . . . . . 92
Ambient Sensor Circuit. . . . . . . . . . . ..92
In-vehicle Sensor Circuit. . . . . . . . . . . 95
Sunload Sensor Circuit. . . . . . . . . . . ..99
Intake Sensor Circuit . . . . . . . . . . . ...102
Air Mix Door Motor PBR Circuit . . . . . . . ..104
SERVICE PROCEDURE. . . . . . . . . . . ..105
HFC-134a (R-134a) Service Procedure . . . . ..105
Maintenance of Lubricant Quantity in
Compressor . . . . . . . . . . . . . . . .107
Compressor . . . . . . . . . . . . . . . . 110
Compressor Clutch . . . . . . . . . . . . .. 111
Thermal Protector . . . . . . . . . . . . . 114
Heater Unit (Heater Core) . . . . . . . . . ... 114
Blower Unit . . . . . . . . . . . . . . . .. 115
Cooling Unit (A/C Evaporator). . . . . . . . . 116
Refrigerant Lines . . . . . . . . . . . . . . 117
Belt. . . . . . . . . . . . . . . . . . ...122
Idle Air Control Valve (IACV) - Auxiliary Air
Control (AAC) Valve . . . . . . . . . . . . 122
Ventilation Air Filter. . . . . . . . . . . . ..122
SERVICE DATA AND SPECIFICATIONS (SDS) . ...123
Auto. . . . . . . . . . . . . . . . . . ..123
MANUAL
PRECAUTIONS . . . . . . . . . . . . . . ...124
Supplemental Restraint System (SRS)
. . ...124
Precautions for Working with HFC-134a
(R-134a). . . . . . . . . . . . . . . . ...124
General Refrigerant Precautions . . . . . . . .125
Precautions for Leak Detection Dye. . . . . . 125
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
Identification. . . . . . . . . . . . . . . .126
Precautions for Refrigerant Connection . . . . ..126
Precautions for Servicing Compressor. . . . . 128
Precautions for Service Equipment . . . . . . .128
Wiring Diagrams and Trouble Diagnosis. . . . .130
PREPARATION . . . . . . . . . . . . . . ...131
Special Service Tools . . . . . . . . . . . ..131
HFC-134a (R-134a) Service Tools and
Equipment. . . . . . . . . . . . . . . . 132
DESCRIPTION . . . . . . . . . . . . . . . .135
Refrigeration System . . . . . . . . . . . ...135
Component Layout . . . . . . . . . . . . ..136
Control Operation . . . . . . . . . . . . . 137
Discharge Air Flow. . . . . . . . . . . . ...138
System Description. . . . . . . . . . . . ..139
TROUBLE DIAGNOSES. . . . . . . . . . . ..140
Component Location. . . . . . . . . . . . 140
Circuit Diagram - Air Conditioner. . . . . . . .142
Wiring Diagram - A/C, M - . . . . . . . . . ...143
How to Perform Trouble Diagnoses for Quick
and Accurate Repair . . . . . . . . . . . . 147
Operational Check . . . . . . . . . . . . ...148
A/C System. . . . . . . . . . . . . . . ..150
Intake Door . . . . . . . . . . . . . . . ..152
Mode Door Motor. . . . . . . . . . . . . .156
Air Mix Door. . . . . . . . . . . . . . . .162
Blower Motor. . . . . . . . . . . . . . . 167
Magnet Clutch. . . . . . . . . . . . . . ..174
Insufficient Cooling . . . . . . . . . . . . ..182
Insufficient Heating . . . . . . . . . . . . ..189
Noise. . . . . . . . . . . . . . . . . . 190
SERVICE PROCEDURE. . . . . . . . . . . ..191
HFC-134a (R-134a) Service Procedure . . . . ..191
Maintenance of Lubricant Quantity in
Compressor . . . . . . . . . . . . . . . .193
Compressor . . . . . . . . . . . . . . . .196
Compressor Clutch . . . . . . . . . . . . ..197
Thermal Protector . . . . . . . . . . . . . 200
Heater Unit (Heater Core) . . . . . . . . . ...200
Blower Unit . . . . . . . . . . . . . . . ..201
Cooling Unit (A/C Evaporator). . . . . . . . .202
Refrigerant Lines . . . . . . . . . . . . . .203
Belt. . . . . . . . . . . . . . . . . . ...208
Idle Air Control Valve (IACV) - Auxiliary Air
Control (AAC) Valve . . . . . . . . . . . . 208
Ventilation Air Filter. . . . . . . . . . . . ..208
SERVICE DATA AND SPECIFICATIONS (SDS) . ...209
Manual . . . . . . . . . . . . . . . . . .209
CONTENTS
(Cont’d)
HA-2
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