2001 INFINITI QX4 coolant

TERMINAL
NO.ITEM CONDITIONVoltage
V
6 Intake door position switch
Intake door positionRECIRCULATION Approximately 4.6
FRESH or 20% FRESH Approximately 0
7Multiplex communication sig-
nal
(AMP,NAVI)ÐÐ
8Multiplex communication sig-
nal
(NAVI,AMP)ÐÐ
9 Sensor ground
Ð Approximately 0
10 Sunload sensor Ð Ð
11 Thermal transmitter
Engine coolant
temperatureApproximately 30ÉC (86ÉF) Approximately 9.4
Approximately 55ÉC (131ÉF) Approximately 6.5
Approximately 100ÉC
(212ÉF)Approximately 2.4
Approximately 110ÉC
(230ÉF)Approximately 1.9
14 A/C LAN signal Ð Approximately 5.5
17 ECM signalCompressor: ON Approximately 0
Compressor: OFF Approximately 4.6
18 Intake door position switch Intake door positionFRESH Approximately 4.6
RECIRCULATION or 20%
FRESHApproximately 0
19 Intake door position switch Intake door position20% FRESH Approximately 4.6
RECIRCULATION or
FRESHApproximately 0
20Multiplex communication sig-
nal (CLK)ÐÐ
21 Power supply for door motor
Ð Approximately 12
22 Compressor ON signalCompressor: ON Approximately 0
Compressor: OFF Approximately 4.6
24 Power supply for BAT Ð BATTERY VOLTAGE
TROUBLE DIAGNOSES
Auto Amp. Terminals and Reference Value (Cont'd)
HA-42

SYSTEM DESCRIPTION=NBHA0062Component partsNBHA0062S01Fan speed control system components are:
1) Auto amp.
2) Fan control amp.
3) A/C LAN system (PBR built-in mode door motor and air mix door motor)
4) In-vehicle sensor
5) Ambient sensor
6) Sunload sensor
7) Intake sensor
System OperationNBHA0062S02
SHA006FF
Automatic ModeNBHA0062S03In the automatic mode, the blower motor speed is calculated by the automatic amplifier based on inputs from
the PBR, in-vehicle sensor, sunload sensor, intake sensor and ambient sensor. The blower motor applied
voltage ranges from approximately 5 volts (lowest speed) to 12 volts (highest speed).
The control blower speed (in the range of 5 to 12V), the automatic amplifier supplies a gate voltage to the fan
control amplifier. Based on this voltage, the fan control amplifier controls the voltage supplied to the blower
motor.
Starting Fan Speed ControlNBHA0062S04Start Up From ªCOLD SOAKº Condition (Automatic mode)NBHA0062S0401In a cold start up condition where the engine coolant temperature is below 50ÉC (122ÉF), the blower will not
operate for a short period of time (up to 126 seconds). The exact start delay time varies depending on the
ambient and engine coolant temperature.
In the most extreme case (very low ambient) the blower starting delay will be 126 seconds as described above.
After this delay, the blower will operate at low speed until the engine coolant temperature rises above 55ÉC
(131ÉF), at which time the blower speed will increase to the objective speed.
Start Up From Normal or ªHOT SOAKº Condition (Automatic mode)
NBHA0062S0402The blower will begin operation momentarily after the AUTO button is pushed. The blower speed will gradu-
ally rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
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TROUBLE DIAGNOSES
Blower Motor (Cont'd)
HA-97

Brake fluid change ...........................................BR-7
Brake fluid level .............................................MA-25
Brake fluid level and line check .......................BR-7
Brake hydraulic line ..........................................BR-9
Brake inspection ............................................MA-25
Brake lines and cables inspection .................MA-25
Brake lining wear temporary checking ..........MA-26
Brake master cylinder ....................................BR-16
Brake pedal ....................................................BR-14
Bulb specifications ........................................EL-456
Bumper, front ..................................................BT-12
Bumper, rear ...................................................BT-15
BYPS/V - Wiring diagram ....................EC-587, 594
C
Camshaft inspection ......................................EM-42
Camshaft position sensor (PHASE) .............EC-342
Canister-See EVAP canister ..........................EC-32
Center bearing assembly (propeller
shaft) .............................................................PD-9
Center bearing disassembly (propeller
shaft) .............................................................PD-7
Center case (Transfer) ..................................TF-123
CHARGE - Wiring diagram ............................SC-20
Charging system ............................................SC-19
Chassis and body maintenance ....................MA-21
CHIME - Wiring diagram...............................EL-127
CIGAR - Wiring diagram ...............................EL-148
Cigarette lighter.............................................EL-148
Circuit breaker.................................................EL-16
CKPS - Wiring diagram ................................EC-334
Closed loop control (Left bank) ....................EC-491
Closed loop control (Right bank) .................EC-491
Closed throttle position switch .....................EC-431
Clutch drum (Transfer) ..................................TF-125
Clutch force release limit adjustment .............TF-39
Clutch pressure switch (Transfer) .................TF-111
Coil spring (front)..............................................SU-8
Coil spring (rear) ............................................SU-18
Collision diagnosis..........................................RS-59
Combination lamp, front, removal and
installation ...................................................BT-12
Combination lamp, rear, removal and
installation ...................................................BT-35
Combination meter..........................................EL-94
Combination meter removal and instal-
lation - See Instrument panel ......................BT-21
Combination switch .........................................EL-28
COMPAS - Wiring diagram ...........................EL-111
Compass .......................................................EL-110
Component Location (auto A/C).....................HA-27
Compression pressure ...................................EM-14
Compressor clutch removal and
installation .................................................HA-150
Compressor precaution ....................................HA-6
Compressor special service tool ....................HA-10
Connecting rod...............................................EM-65
Connecting rod bearing clearance.................EM-69
Connecting rod bushing clearance ................EM-70Connector inspection .......................................GI-21
Console box - See Instrument panel ..............BT-21
CONSULT for ABS .........................................BR-43
CONSULT for all-mode 4WD ..........................TF-30
CONSULT for engine .....................................EC-81
CONSULT-II general information .....................GI-38
Control valve (A/T) ........................................AT-301
Control valve (Transfer) ................................TF-128
Converter housing installation .......................AT-278
Coolant mixture ratio......................................MA-12
Coolant replacement ......................................MA-14
Cooling circuit (engine) ...................................LC-10
``Crankcase emission control system -
See positive crankcase ventilation''............EC-38
Crankshaft ......................................................EM-67
Crankshaft position sensor (POS) ...............EC-334
Crankshaft position sensor (POS)
chipping ....................................................EC-517
Crankshaft position sensor (REF) ................EC-510
Cruise control - See ASCD ...........................EL-221
Cylinder block ................................................EM-61
Cylinder head .................................................EM-38
Cylinder head bolt tightening .........................EM-49
D
Data link connector for Consult......................EC-81
Daytime light system.......................................EL-46
Daytime running light - See Daytime
light system .................................................EL-46
DEF - Wiring diagram ...................................EL-153
Detonation sensor - See Knock sensor .......EC-328
Diagnostic trouble code (DTC) for OBD
system ....................................................EC-8, 60
Diagnostic trouble code (DTC) inspec-
tion priority chart .......................................EC-116
Differential carrier assembly.....................PD-30, 57
Differential carrier disassembly ......................PD-44
Differential gear oil replacement ....................MA-24
Dimensions ......................................................GI-43
D/LOCK - Wiring diagram .............................EL-256
Dome light - See Interior lamp .......................EL-88
Door glass .......................................................BT-18
Door lock .........................................................BT-18
Door mirror ......................................................BT-56
Door trim .........................................................BT-30
Door, front .......................................................BT-18
Door, rear ........................................................BT-20
Drive belt inspection ......................................MA-13
Drive chain (Transfer) ...................................TF-125
Drive pinion diff. inspection ......................PD-23, 47
Drive pinion height ...................................PD-25, 53
Drive plate runout ..........................................EM-70
Drive shaft (front)............................................AX-10
Dropping resistor (A/T) ..................................AT-167
DTC work support ..........................................EC-93
DTRL - Wiring diagram ...................................EL-51
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ALPHABETICAL INDEX
IDX-3

E
ECM input/output signal ...............................EC-127
ECTS - Wiring diagram ........................EC-171, 189
Electric sun roof ............................................EL-173
Electrical diagnoses.........................................GI-24
Electrical ignition system ................................EC-30
Electrical unit ................................................Foldout
Electrical units location .................................EL-436
Engine compartment .......................................BT-58
Engine control circuit diagram........................EC-24
Engine control component parts
location .......................................................EC-20
Engine control module (ECM) ......................EC-444
Engine control system diagram and
chart ............................................................EC-25
Engine coolant temperature sensor
(ECTS) ..............................................EC-169, 187
Engine fail-safe system ................................EC-117
Engine oil filter replacement ..........................MA-18
Engine oil precautions .......................................GI-8
Engine oil replacement ..................................MA-18
Engine outer component parts ......................EM-10
Engine removal ..............................................EM-57
Engine room - See Engine
compartment................................................BT-58
Engine serial number ......................................GI-43
EVAP canister.................................................EC-33
EVAP canister purge volume control
solenoid valve.............................EC-32, 367, 541
EVAP canister vent control
valve .........................................EC-374, 553, 573
EVAP control system (small leak)
diagnosis ..................................EC-352, 394, 526
EVAP control system pressure sensor.........EC-381
EVAP control system purge flow moni-
toring diagnosis.........................................EC-561
EVAP vapor lines inspection ..........................MA-20
Evaporative emission (EVAP) system ............EC-32
Exhaust system ................................................FE-8
Exhaust system inspection ............................MA-21
Exterior ............................................................BT-35
F
4LO indicator lamp........................................TF-104
4WD shift indicator lamp.................................TF-98
4WD shift switch ............................................TF-111
4WD solenoid valve.......................................TF-111
4WD warning lamp .........................................TF-13
Fan control amp. ............................................HA-98
F/FOG - Wiring diagram .................................EL-72
Final drive disassembly ..................................PD-43
Final drive pre-inspection ...............................PD-43
Final drive removal and installation ...............PD-43
Finisher, interior - See Trim ............................BT-28
F/LID - Wiring diagram .................................EL-180
Fluid temperature sensor (A/T) .....................AT-110Fluids ..............................................................MA-11
Flywheel runout..............................................EM-70
FO2H-L - Wiring diagram .............................EC-243
FO2H-R - Wiring diagram ............................EC-242
Fog lamp, front................................................EL-70
Fog lamp, front, removal and
installation ...................................................BT-12
Forward clutch ...............................................AT-320
F/PUMP - Wiring diagram ............................EC-627
Freeze frame data ..........................................EC-60
FRO2LH - Wiring diagram ...........EC-197, 223, 235
FRO2RH - Wiring diagram...........EC-196, 222, 234
Front axle..........................................................AX-2
Front bumper ..................................................BT-12
Front case (Transfer) ....................................TF-133
Front combination lamp removal and
installation ...................................................BT-12
Front disc brake .............................................BR-22
Front door .......................................................BT-18
Front drive shaft (Transfer) ...........................TF-125
Front final drive disassembly (4WD) ..............PD-18
Front final drive pre-inspection (4WD) ...........PD-18
Front final drive removal and installa-
tion (4WD)...................................................PD-18
Front fog lamp.................................................EL-70
Front fog lamp removal and installation .........BT-12
Front heated oxygen sensor (HO2S)
(Left bank) ................EC-192, 202, 210, 218, 231
Front heated oxygen sensor (HO2S)
(Right bank) .............EC-192, 202, 210, 218, 231
Front heated oxygen sensor heater
(Left bank).................................................EC-240
Front heated oxygen sensor heater
(Right bank) ..............................................EC-240
Front revolution sensor (Transfer) ................TF-112
Front seat ........................................................BT-41
Front seat belt ..................................................RS-4
Front suspension ..............................................SU-2
Front washer .................................................EL-136
Front wiper ....................................................EL-136
Fuel cut control (at no load & high
engine speed) .............................................EC-32
Fuel filler lid.....................................................BT-15
Fuel filter replacement ...................................MA-16
Fuel gauge ......................................................EL-94
Fuel injection system (Left bank) .........EC-294, 302
Fuel injection system (Right bank) ......EC-294, 302
Fuel lid opener, electric.................................EL-180
Fuel line inspection ........................................MA-16
Fuel precautions ................................................GI-8
Fuel pressure check .......................................EC-39
Fuel pressure regulator ..................................EC-40
Fuel pressure release ....................................EC-39
Fuel pump ....................................................EC-625
Fuel system ......................................................FE-4
Fuel tank temperature sensor ......................EC-309
Fuel tank vacuum relief valve ........................EC-33
FUELLH - Wiring diagram....................EC-297, 305
FUELRH - Wiring diagram ...................EC-296, 304
Fuse ................................................................EL-16
Fuse block ....................................................Foldout
ALPHABETICAL INDEX
IDX-4

ENGINE LUBRICATION &
COOLING SYSTEMS
SECTION
LC
CONTENTS
ENGINE LUBRICATION SYSTEM..................................2
Precautions ..................................................................2
LIQUID GASKET APPLICATION PROCEDURE............2
Preparation ..................................................................2
SPECIAL SERVICE TOOLS........................................2
COMMERCIAL SERVICE TOOL..................................3
Lubrication Circuit ........................................................3
Oil Pressure Check......................................................4
Oil Pump ......................................................................5
REMOVAL AND INSTALLATION.................................5
DISASSEMBLY AND ASSEMBLY................................5
OIL PUMP INSPECTION............................................6
REGULATOR VALVE INSPECTION............................6
OIL FILTER...............................................................7
Oil Cooler .....................................................................7
REMOVAL AND INSTALLATION.................................7
INSPECTION.............................................................8
Service Data and Specifications (SDS).......................8
OIL PRESSURE........................................................8
REGULATOR VALVE.................................................8
OIL PUMP.................................................................8
ENGINE COOLING SYSTEM..........................................9
Precautions ..................................................................9
LIQUID GASKET APPLICATION PROCEDURE............9
Preparation ..................................................................9
SPECIAL SERVICE TOOLS........................................9
Cooling Circuit ...........................................................10
System Check............................................................ 11
CHECKING COOLING SYSTEM HOSES................... 11
CHECKING RADIATOR............................................ 11
CHECKING RADIATOR CAP.................................... 11
CHECKING COOLING SYSTEM FOR LEAKS............12
Water Pump ...............................................................12
REMOVAL AND INSTALLATION...............................12
REMOVAL...............................................................12
INSPECTION...........................................................14
INSTALLATION........................................................14
Thermostat .................................................................16
REMOVAL AND INSTALLATION...............................16
INSPECTION...........................................................16
Water Control Valve ...................................................17
REMOVAL AND INSTALLATION...............................17
INSPECTION...........................................................18
Radiator .....................................................................19
REMOVAL AND INSTALLATION...............................19
Cooling Fan (Crankshaft driven) ...............................20
REMOVAL AND INSTALLATION...............................20
INSPECTION...........................................................20
Refilling Engine Coolant ............................................20
Radiator (Aluminum type) ..........................................21
PREPARATION.......................................................21
DISASSEMBLY........................................................21
ASSEMBLY.............................................................22
INSPECTION...........................................................23
Overheating Cause Analysis .....................................24
Service Data and Specifications (SDS).....................25
THERMOSTAT........................................................25
WATER CONTROL VALVE.......................................25
RADIATOR..............................................................25
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SEM164F
AEM080
Precautions
LIQUID GASKET APPLICATION PROCEDURENBLC00011. Use a scraper to remove all traces of old liquid gasket from
mating surfaces and grooves. Also, completely clean any oil
from these areas.
2. Apply a continuous bead of liquid gasket to mating surfaces.
(Use Genuine RTV silicone sealant Part No. 999MP-A7007
or equivalent.)
IFor oil pan, be sure liquid gasket diameter is 4.0 to 5.0 mm
(0.157 to 0.197 in).
IFor areas except oil pan, be sure liquid gasket diameter is 2.0
to 3.0 mm (0.079 to 0.118 in).
3. Apply liquid gasket around the inner side of bolt holes (unless
otherwise specified).
4. Assembly should be done within 5 minutes after coating.
5. Wait at least 30 minutes before refilling engine oil and engine
coolant.
Preparation
SPECIAL SERVICE TOOLSNBLC0002The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
ST25051001
(J25695-1)
Oil pressure gauge
NT050
ST25052000
(J25695-2)
Hose
NT559
Adapting oil pressure gauge to upper oil pan
WS39930000
(Ð)
Tube pressure
NT052
Pressing the tube of liquid gasket
ENGINE LUBRICATION SYSTEM
Precautions
LC-2

SLC935AA
4. Check regulator valve to oil pump body clearance.
Clearance:
6 : 0.040 - 0.097 mm (0.0016 - 0.0038 in)
If it exceeds the limit, replace oil pump body.
ALC094
OIL FILTERNBLC0009The oil filter is a small, full-flow cartridge type and is provided with
a relief valve.
IUse Tool specified in MA-18 for changing oil filter.
Oil Cooler
REMOVAL AND INSTALLATIONNBLC0036
SLC332B
1. Drain engine oil and coolant.
IDo not spill coolant on the drive belt.
2. Remove oil cooler.
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ENGINE LUBRICATION SYSTEM
Oil Pump (Cont'd)
LC-7

IInspect the oil cooler after removing it.
SLC333B
3. Installation is in reverse order of removal.
IWhen installing the oil cooler, align the oil cooler stopper
with the stopper of the oil cooler bracket.
INSPECTIONNBLC0037Oil CoolerNBLC0037S011. Check oil cooler for cracks.
2. Check oil cooler for clogging by blowing through coolant inlet.
If necessary, replace oil cooler assembly.
Oil Pressure Relief ValveNBLC0037S02Inspect oil pressure relief valve for movement, cracks and breaks
by pushing the ball. If replacement is necessary, remove valve by
prying it out with a suitable tool. Install a new valve in place by
tapping it.
Service Data and Specifications (SDS)
OIL PRESSURENBLC0010
Engine speed
rpmApproximate discharge pressure
kPa (kg/cm2, psi)
Idle speed
2,000More than 98 (1.0, 14)
294 (3.0, 43)
REGULATOR VALVENBLC0011Unit: mm (in)
Regulator valve to oil pump cover clearance 0.040 - 0.097 (0.0016 - 0.0038)
OIL PUMPNBLC0012Unit: mm (in)
Body to outer rotor radial clearance 0.114 - 0.200 (0.0045 - 0.0079)
Inner rotor to outer rotor tip clearance Below 0.18 (0.0071)
Body to inner rotor axial clearance 0.030 - 0.070 (0.0012 - 0.0028)
Body to outer rotor axial clearance 0.050 - 0.110 (0.0020 - 0.0043)
Inner rotor to brazed portion of housing clearance 0.045 - 0.091 (0.0018 - 0.0036)
ENGINE LUBRICATION SYSTEM
Oil Cooler (Cont'd)
LC-8