Infiniti QX4 (R50). Manual — part 410
NBEL0145
Use the chart below to find out what each wiring
diagram code stands for.
Refer to the wiring diagram code in the alphabetical
index to find the location (page number) of each
wiring diagram.
Code
Section
Wiring Diagram Name
1STSIG
AT
A/T 1ST Signal
2NDSIG
AT
A/T 2ND Signal
3RDSIG
AT
A/T 3RD Signal
4THSIG
AT
A/T 4TH Signal
A/C, A
HA
Auto Air Conditioner
AAC/V
EC
IACV-AAC Valve
ABS
BR
Anti-lock Brake System
AP/SEN
EC
Absolute Pressure Sensor
ASCD
EL
Automatic Speed Control Device
AT/C
EC
A/T Control
ATDIAG
EC
A/T Diagnosis Communication
Line
AT/IND
EL
A/T Indicator Lamp
AUDIO
EL
Audio
AUT/DP
EL
Automatic Drive Positioner
BA/FTS
AT
A/T Fluid Temperature Sensor
and TCM Power Supply
BACK/L
EL
Back-up Lamp
BYPS/V
EC
Vacuum Cut Valve Bypass Valve
CHARGE
SC
Charging System
CHIME
EL
Warning Chime
CIGAR
EL
Cigarette Lighter
CLOCK
EL
Clock
COMPAS
EL
Compass and Thermometer
D/LOCK
EL
Power Door Lock
DEF
EL
Rear Window Defogger
DTRL
EL
Headlamp — With Daytime Light
System —
ECTS
EC
Engine Coolant Temperature Sen-
sor
ENGSS
AT
Engine Speed Signal
F/FOG
EL
Front Fog Lamp
F/LID
EL
Fuel Lid Opener
F/PUMP
EC
Fuel Pump Control
FICD
EC
IACV-FICD Solenoid Valve
FLS1
EC
Fuel Gauge
Code
Section
Wiring Diagram Name
FLS2
EC
Fuel Gauge
FLS3
EC
Fuel Gauge
FTS
AT
A/T Fluid Temperature Sensor
FUELLH
EC
Fuel Injection System Function
(Left Bank)
FUELRH
EC
Fuel Injection System Function
(Right Bank)
H/AIM
EL
Headlamp Aiming Control System
H/LAMP
EL
Headlamp
HORN
EL
Horn
HSEAT
EL
Heated Seat
IATS
EC
Intake Air Temperature Sensor
IGN/SG
EC
Ignition Signal
ILL
EL
Illumination
INJECT
EC
Injector
INT/L
EL
Interior, Spot, Vanity Mirror, and
Luggage Room Lamps
IVC-L
EC
Intake Valve Timing Control Sole-
noid Valve LH
IVC-R
EC
Intake Valve Timing Control Sole-
noid Valve RH
IVCS
EL
INFINITI Communicator
IVCS-L
EC
Intake Valve Timing Control Posi-
tion Sensor LH
IVCS-R
EC
Intake Valve Timing Control Posi-
tion Sensor RH
KS
EC
Knock Sensor
LAN
AT
A/T Communication Line
LOAD
EC
Electrical Load Signal
LPSV
AT
Line Pressure Solenoid Valve
MAFS
EC
Mass Air Flow Sensor
MAIN
AT
Main Power Supply and Ground
Circuit
MAIN
EC
Main Power Supply and Ground
Circuit
METER
EL
Speedometer, Tachometer, Temp.,
Oil, and Fuel Gauges
MIL/DL
EC
MIL and Data Link Connectors
MIRROR
EL
Door Mirror
MULTI
EL
Multi-remote Control System
NATS
EL
IVIS (Infiniti Vehicle Immobiliser
System)
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
WIRING DIAGRAM CODES (CELL CODES)
EL-457
Code
Section
Wiring Diagram Name
NAVI
EL
Navigation System
NONDTC
AT
Non-detectable Items
O2H1B1
EC
Heated Oxygen Sensor 1 Heater
(Front) (Bank 1)
O2H1B2
EC
Heated Oxygen Sensor 1 Heater
(Front) (Bank 2)
O2H2B1
EC
Heated Oxygen Sensor 2 Heater
(Rear) (Bank 1)
O2H2B2
EC
Heated Oxygen Sensor 2 Heater
(Rear) (Bank 2)
O2S1B1
EC
Heated Oxygen Sensor 1 (Front)
(Bank 1)
O2S1B2
EC
Heated Oxygen Sensor 1 (Front)
(Bank 2)
O2S2B1
EC
Heated Oxygen Sensor 2 (Rear)
(Bank 1)
O2S2B2
EC
Heated Oxygen Sensor 2 (Rear)
(Bank 2)
OVRCSV
AT
Overrun Clutch Solenoid Valve
P/ANT
EL
Power Antenna
PGC/V
EC
EVAP Canister Purge Volume
Control Solenoid Valve
PHASE
EC
Camshaft Position Sensor
(PHASE)
PNP/SW
EC
Park/Neutral Position Switch
PNP/SW
AT
Park/Neutral Position Switch
POS
EC
Crankshaft Position Sensor
(CKPS) (POS)
POWER
EL
Power Supply Routing
PRE/SE
EC
EVAP Control System Pressure
Sensor
PST/SW
EC
Power Steering Oil Pressure
Switch
REF
EC
Crankshaft Position Sensor
(CKPS) (REF)
REMOTE
EL
Audio (Remote Control Switch)
RP/SEN
EC
Refrigerant Pressure
S/SIG
EC
Start Signal
S/VCSW
EC
Swirl Control Valve Control
Vacuum Check Switch
SEAT
EL
Power Seat
SHIFT
AT
A/T Shift Lock System
SROOF
EL
Sunroof
SRS
RS
Supplemental Restraint System
Code
Section
Wiring Diagram Name
SSV/A
AT
Shift Solenoid Valve A
SSV/B
AT
Shift Solenoid Valve B
START
SC
Starting System
STOP/L
EL
Stop lamp
SWL/V
EC
Swirl Control Valve Control Sole-
noid Valve
TAIL/L
EL
Parking, License and Tail Lamps
TCCSIG
AT
A/T TCC Signal (Lock up)
TCV
AT
Torque Converter Clutch Solenoid
Valve
T/F
TF
Transfer
TFTS
EC
Tank Fuel Temperature Sensor
THEFT
EL
Theft Warning System
TLID
EL
Glass Hatch Opener
TP/SW
EC
Throttle Position Switch
TPS
AT
Throttle Position Sensor
TPS
EC
Throttle Position Sensor
TRNSMT
EL
Integrated HOMELINK
Y
Trans-
mitter
TRSA/T
AT
Turbine Revolution Sensor
TURN
EL
Turn Signal and Hazard Warning
Lamps
VIAS/V
EC
Variable Induction Air Control Sys-
tem
VSS
EC
Vehicle Speed Sensor
VSSA/T
AT
Vehicle Speed Sensor A/T (Revo-
lution Sensor)
VSSMTR
AT
Vehicle Speed Sensor MTR
WARN
EL
Warning Lamps
WINDOW
EL
Power Window
WIP/R
EL
Rear Wiper and Washer
WIPER
EL
Front Wiper and Washer
WIRING DIAGRAM CODES (CELL CODES)
EL-458
ENGINE MECHANICAL
CONTENTS
PRECAUTIONS . . . . . . . . . . . . . . . ...3
Parts Requiring Angular Tightening. . . . . . . .3
Liquid Gasket Application Procedure . . . . . . ..3
PREPARATION . . . . . . . . . . . . . . . ...4
Special Service Tools . . . . . . . . . . . . ..4
Commercial Service Tools . . . . . . . . . . ...6
NOISE, VIBRATION AND HARSHNESS (NVH)
TROUBLESHOOTING . . . . . . . . . . . . . .8
NVH Troubleshooting - Engine Noise . . . . . . .9
OUTER COMPONENT PARTS . . . . . . . . . .10
Removal and Installation . . . . . . . . . . ...10
. . . . . . . . ...12
MEASUREMENT OF COMPRESSION PRESSURE . 14
OIL PAN. . . . . . . . . . . . . . . . . . .15
Components. . . . . . . . . . . . . . . ...15
Removal. . . . . . . . . . . . . . . . . .15
Installation. . . . . . . . . . . . . . . . ..18
TIMING CHAIN . . . . . . . . . . . . . . . ..20
Components. . . . . . . . . . . . . . . ...20
POSITION FOR APPLYING LIQUID GASKET
. . . 21
Removal. . . . . . . . . . . . . . . . . .23
Inspection. . . . . . . . . . . . . . . . ...29
Installation. . . . . . . . . . . . . . . . ..29
OIL SEAL. . . . . . . . . . . . . . . . . ...35
Replacement. . . . . . . . . . . . . . . ..35
. . . . . . . . . . . . . .35
OIL SEAL INSTALLATION DIRECTION
. . . . . .36
. . . . . . . . . . . . . 36
. . . . . . . . . . . . . ..36
CYLINDER HEAD. . . . . . . . . . . . . . ..38
Components. . . . . . . . . . . . . . . ...38
Removal. . . . . . . . . . . . . . . . . .39
Disassembly. . . . . . . . . . . . . . . ...41
Inspection. . . . . . . . . . . . . . . . ...42
. . . . . . . ...42
. . . . . . . . . 42
. . . . . . . . . . . ..42
. . . . . . . . . ...42
. . . . . . 42
. . . . . . . . . . . 43
. . . . . . ...43
. . . . . . . . . 43
. . . . . . . . 44
. . . . . . . . . . . . . . .45
REPLACING VALVE SEAT FOR SERVICE PARTS
. 45
. . . . . . . . . . . ...46
. . . . . . . . . . . . . ...46
. . . . . . . . . . . . . . 46
Assembly . . . . . . . . . . . . . . . . ...47
Installation. . . . . . . . . . . . . . . . ..47
Valve Clearance. . . . . . . . . . . . . . .52
. . . . . . . . . . . . . . . .52
. . . . . . . . . . . . . . . 54
ENGINE ASSEMBLY. . . . . . . . . . . . . .57
Removal and Installation . . . . . . . . . . ...57
. . . . . . . . . . . . . . . ...58
. . . . . . . . . . . . . . 60
CYLINDER BLOCK . . . . . . . . . . . . . ...61
Components. . . . . . . . . . . . . . . ...61
. . . . . . . . . 62
Removal and Installation . . . . . . . . . . ...62
Disassembly. . . . . . . . . . . . . . . ...62
PISTON, CRANKSHAFT AND OIL JET
. . . . . ..62
Inspection. . . . . . . . . . . . . . . . ...63
PISTON AND PISTON PIN CLEARANCE
. . . . ..63
. . . . . . . 64
CONNECTING ROD BEND AND TORSION
. . . ...65
CYLINDER BLOCK DISTORTION AND WEAR
. . ...65
. . . . . . . ..66
. . . . . . . . . . . . . . .67
. . . . . . . . . . ...67
CONNECTING ROD BUSHING CLEARANCE
(SMALL END)
. . . . . . . . . . . . . . ..70
. . . . . . . . . . ..70
Assembly . . . . . . . . . . . . . . . . ...71
. . . . . . . . . . . . . . . . ..71
. . . . . . . . . . . . . . . . ..71
. . . . . . . . . . . . . . .71
REPLACEMENT OF PILOT CONVERTER
. . . . .74
. . . . . . . . . . . . . . .74
GI
MA
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SERVICE DATA AND SPECIFICATIONS (SDS) . . .75
General Specifications. . . . . . . . . . . ...75
Compression Pressure . . . . . . . . . . . ..75
Cylinder Head . . . . . . . . . . . . . . . 75
Valve . . . . . . . . . . . . . . . . . . ..76
. . . . . . . . . . . . . . . . . 76
. . . . . . . . . . . . ..76
. . . . . . . . . . . . . ...78
. . . . . . . . . . . . . . 78
. . . . . . . . . . . . . . .79
Valve Seat. . . . . . . . . . . . . . . . ..79
Camshaft and Camshaft Bearing . . . . . . . ..80
Cylinder Block. . . . . . . . . . . . . . . 81
Piston, Piston Ring and Piston Pin . . . . . . ...82
. . . . . . . . . . . . 82
. . . . . . . . . . . . . . .83
. . . . . . . . . . . . . . . 83
Connecting Rod . . . . . . . . . . . . . . .83
Crankshaft. . . . . . . . . . . . . . . . ..84
Available Main Bearing. . . . . . . . . . . ..85
. . . . . . . . . . . . . . . 85
Available Connecting Rod Bearing. . . . . . . 86
. . . . . . . . .86
. . . . . . . . . . . . . . . 86
Miscellaneous Components. . . . . . . . . ...86
. . . . . . . . . . ...86
CONTENTS
(Cont’d)
EM-2
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