Ignition harness INFINITI QX4 2001 Factory Service Manual

SEM415G
17. Disconnect injector harness connectors.
18. Remove fuel tube assembly in reverse order of installation.
Refer to EM-12, ªFuel Tubeº.
SEM416G
19. Remove ignition coils.
20. Remove RH and LH rocker covers from cylinder head.
SEM417G
21. Set No. 1 piston at TDC on the compression stroke by rotat-
ing crankshaft.
IAlign pointer with TDC mark on crankshaft pulley.
SEM418G
ICheck that intake and exhaust cam nose on No. 1 cylinder are
installed as shown left.
If not, turn the crankshaft one revolution (360É) and align as
above.
SEM485G
22. Remove starter motor, and set ring gear stopper using the
mounting bolt hole.
IBe careful not to damage the signal plate teeth.
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TIMING CHAIN
Removal (Cont'd)
EM-25

12. Apply sealant to the hatched portion of rear timing chain case.
IApply continuous bead of liquid gasket to mating surface of
rear timing chain case.
Refer to ªPOSITION FOR APPLYING LIQUID GASKETº,
EM-21.
IBefore installation, wipe off the protruding sealant.
SEM448G
13. Align rear timing chain case with dowel pins, then install on
cylinder head and block.
14. Tighten rear chain case bolts.
a. Tighten bolts in numerical order shown in the figure.
b. Repeat above step a.
15. Reinstall all removed parts in reverse order of removal.
SEM868E
Valve ClearanceNBEM0022CHECKINGNBEM0022S01Check valve clearance while engine is cold and not running.
1. Remove engine cover.
2. Remove air duct with air cleaner case, collectors, hoses, wires,
harnesses, connectors and so on.
3. Remove intake manifold collectors.
4. Remove ignition coils and spark plugs.
5. Remove RH and LH rocker covers.
6. Set No. 1 cylinder at TDC on its compression stroke.
IAlign pointer with TDC mark on crankshaft pulley.
CYLINDER HEAD
Installation (Cont'd)
EM-52

PrecautionsNBGI0001Observe the following precautions to ensure safe and proper
servicing. These precautions are not described in each indi-
vidual section.
SGI646
PRECAUTIONS FOR SUPPLEMENTAL RESTRAINT
SYSTEM (SRS) ªAIR BAGº AND ªSEAT BELT
PRE-TENSIONERº
NBGI0001S01The Supplemental Restraint System such as ªAIR BAGº and ªSEAT
BELT PRE-TENSIONERº used along with a seat belt, helps to
reduce the risk or severity of injury to the driver and front passen-
ger for certain types of collision. The SRS system composition
which is available to INFINITI QX4 is as follows:
IFor a frontal collision
The Supplemental Restraint System consists of driver air bag
module (located in the center of the steering wheel), front pas-
senger air bag module (located on the instrument panel on
passenger side), seat belt pre-tensioners, a diagnosis sensor
unit, warning lamp, wiring harness and spiral cable.
IFor a side collision
The Supplemental Restraint System consists of side air bag
module (located in the outer side of front seat), satellite sensor,
diagnosis sensor unit (one of components of air bags for a
frontal collision), wiring harness, warning lamp (one of compo-
nents of air bags for a frontal collision).
Information necessary to service the system safely is included in
theRS sectionof this Service Manual.
WARNING:
ITo 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 performed by an authorized INFINITI
dealer.
IImproper maintenance, including incorrect removal and
installation of the SRS, can lead to personal injury caused
by unintentional activation of the system. For removal of
Spiral Cable and Air Bag Module, see the RS section.
IDo not use electrical test equipment on any circuit related
to the SRS unless instructed to in this Service Manual.
Spiral cable and wiring harnesses covered with yellow
insulation tape either just before the harness connectors
or for the complete harness are related to the SRS.
PRECAUTIONS FOR IVIS (INFINITI VEHICLE
IMMOBILIZER SYSTEM Ð NATS)
NBGI0001S08IVIS (NATS) will immobilize the engine if someone tries to start it
without the registered key of IVIS (NATS).
Both of the originally supplied ignition key IDs have been IVIS
(NATS) registered.
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PRECAUTIONS
Precautions
GI-3

IClean all disassembled parts in the designated liquid or solvent
prior to inspection or assembly.
IReplace oil seals, gaskets, packings, O-rings, locking washers,
cotter pins, self-locking nuts, etc. with new ones.
IReplace inner and outer races of tapered roller bearings and
needle bearings as a set.
IArrange the disassembled parts in accordance with their
assembled locations and sequence.
IDo not touch the terminals of electrical components which use
microcomputers (such as ECMs).
Static electricity may damage internal electronic components.
IAfter disconnecting vacuum or air hoses, attach a tag to indi-
cate the proper connection.
IUse only the fluids and lubricants specified in this manual.
IUse approved bonding agent, sealants or their equivalents
when required.
IUse tools and recommended special tools where specified for
safe and efficient service repairs.
IWhen repairing the fuel, oil, water, vacuum or exhaust
systems, check all affected lines for leaks.
IDispose of drained oil or the solvent used for cleaning parts in
an appropriate manner.
WARNING:
To prevent ECM from storing the diagnostic trouble codes, do
not carelessly disconnect the harness connectors which are
related to the engine control system and TCM (Transmission
Control Module) system. The connectors should be discon-
nected only when working according to the WORK FLOW of
TROUBLE DIAGNOSES in EC and AT sections.
SGI787
PRECAUTIONS FOR MULTIPORT FUEL INJECTION
SYSTEM OR ENGINE CONTROL SYSTEM
NBGI0001S03IBefore connecting or disconnecting any harness connector for
the multiport fuel injection system or ECM (Engine Control
Module):
Turn ignition switch to OFF position.
Disconnect negative battery terminal.
Otherwise, there may be damage to ECM.
IBefore disconnecting pressurized fuel line from fuel pump to
injectors, be sure to release fuel pressure.
IBe careful not to jar components such as ECM and mass air
flow sensor.
PRECAUTIONS FOR THREE WAY CATALYSTNBGI0001S04If a large amount of unburned fuel flows into the catalyst, the cata-
lyst temperature will be excessively high. To prevent this, follow the
instructions below:
IUse unleaded gasoline only. Leaded gasoline will seriously
damage the three way catalyst.
IWhen checking for ignition spark or measuring engine
compression, make tests quickly and only when necessary.
IDo not run engine when the fuel tank level is low, otherwise the
engine may misfire causing damage to the catalyst.
PRECAUTIONS
Precautions (Cont'd)
GI-6

AGI070
HARNESS INDICATIONNBGI0003S0206ILetter designations next to test meter probe indicate harness
(connector) wire color.
IConnector numbers in a single circle M33 indicate harness
connectors.
COMPONENT INDICATIONNBGI0003S0207IConnector numbers in a double circle F211 indicate compo-
nent connectors.
SGI860
SWITCH POSITIONSNBGI0003S0202Switches are shown in wiring diagrams as if the vehicle is in the
normal condition.
A vehicle is in the normal condition when:
Iignition switch is OFF,
Idoors, hood and trunk lid/back door are closed,
Ipedals are not depressed, and
Iparking brake is released.
HOW TO READ WIRING DIAGRAMS
Description (Cont'd)
GI-16

NBGI0005
NOTICE:
Trouble diagnoses indicates work procedures required to diagnose
problems effectively. Observe the following instructions before
diagnosing.
1)Before performing trouble diagnoses, read the ªPrelimi-
nary Checkº, the ªSymptom Chartº or the ªWork Flowº.
2)After repairs, re-check that the problem has been com-
pletely eliminated.
3)Refer to Component Parts and Harness Connector Loca-
tion for the Systems described in each section for
identification/location of components and harness con-
nectors.
4)Refer to the Circuit Diagram for quick pinpoint check.
If you need to check circuit continuity between harness
connectors in more detail, such as when a sub-harness is
used, refer to Wiring Diagram in each individual section
and Harness Layout in EL section for identification of har-
ness connectors.
5)When checking circuit continuity, ignition switch should
be OFF.
6)Before checking voltage at connectors, check battery volt-
age.
7)After accomplishing the Diagnostic Procedures and Elec-
trical Components Inspection, make sure that all harness
connectors are reconnected as they were.
HOW TO FOLLOW TROUBLE DIAGNOSIS
GI-34

SHA967EE
RHA868H
Check body ground circuit for auto amp. with ignition switch OFF.
Check for continuity between terminal Nos. 32, 14 and body
ground.
Ohmmeter terminal
Continuity
(+) (þ)
32
Body ground Yes
14 (Canada only)
If OK, check auto amp. ground circuit, see below.
IIf NG, check 7.5A fuses (Nos. 11 and 24, located in the fuse
block) and 15A fuses (Nos. 1 and 2, located in the fuse block).
IIf fuses are OK, check for open circuit in wiring harness.
Repair or replace as necessary.
IIf fuses are NG, replace fuse and check wiring harness for
short circuit. Repair or replace as necessary.
NOTE:
If OK, replace auto amp.
If NG, repair or replace harness.
TROUBLE DIAGNOSES
A/C System (Cont'd)
HA-74

Fusible link ......................................................EL-16
G
Garage jack and safety stand .........................GI-46
Gauges............................................................EL-94
Generator - See Alternator .............................SC-28
Generic scan tool (GST) ................................EC-95
Glass ...............................................................BT-18
Glass hatch opener, electric .........................EL-178
Grease ............................................................MA-11
Ground distribution..........................................EL-17
H
Harness connector ............................................EL-5
Harness connector inspection .........................GI-21
Harness layout ..............................................EL-440
Hazard warning lamp ......................................EL-75
Headlamp ........................................................EL-31
Headlamp aiming control ................................EL-59
Headlining - See Roof trim .............................BT-32
Heated seat .......................................BT-43, EL-183
Height (Dimensions) ........................................GI-43
HFC134a (R134a) system precaution .............HA-2
HFC134a (R134a) system service
procedure ..................................................HA-144
HFC134a (R134a) system service tools ........HA-11
HFC134a system service equipment
precaution .....................................................HA-7
High clutch.....................................................AT-317
H/LAMP - Wiring diagram ...............................EL-36
Hood................................................................BT-12
Horn ..............................................................EL-147
HORN - Wiring diagram................................EL-147
How to erase DTC for OBD system...............EC-72
HSEAT - Wiring diagram...............................EL-183
I
IACV-AAC valve ...........................................EC-422
IATS - Wiring diagram ..................................EC-166
Identification .....................................................HA-4
Identification plate............................................GI-42
Idle air control valve (IACV) .........................EC-422
Idle mixture ratio.............................................EC-43
Idle speed .......................................................EC-43
IGN/SG - Wiring diagram .............................EC-501
Ignition control system .................................EC-499
Ignition timing .................................................EC-43
ILL - Wiring diagram .......................................EL-83
Illumination ......................................................EL-80
In vehicle sensor ..........................................HA-132
INFINITI COMMUNICATOR..........................EL-348
Infiniti communicator (IVCS) .........................EL-348
INJECT - Wiring diagram .............................EC-617
Injector ..........................................................EC-616Injector removal and installation ....................EC-41
Instrument panel .............................................BT-21
INT/L - Wiring diagram....................................EL-91
Intake air temparature sensor ......................EC-164
Intake door control linkage adjustment ..........HA-94
Intake door motor ...........................................HA-87
Intake manifold...............................................EM-12
Intake sensor ................................................HA-139
Integrated homelink transmitter ....................EL-325
Interior .............................................................BT-28
Interior lamp ....................................................EL-88
Interior lamp on-off control ..............................EL-89
Internal gear (Transfer) .................................TF-134
IVC-L - Wiring diagram.................................EC-453
IVC-R - Wiring diagram ................................EC-453
IVCS - Wiring diagram ..................................EL-359
IVCS-L - Wiring diagram ..............................EC-485
IVCS-R - Wiring diagram .............................EC-485
IVIS (Infiniti vehicle immobilizer
system) ......................................................EL-328
IVIS (Infiniti vehicle immobilizer sys-
tem) precautions ............................................GI-3
J
Jacking points ..................................................GI-45
Journal bearing assembly (propeller
shaft) .............................................................PD-9
Journal bearing disassembly (propeller
shaft) .............................................................PD-8
Junction box (J/B).........................................Foldout
K
Keyless entry system - See Multi-re-
mote control system ..................................EL-270
Knock sensor (KS) .......................................EC-328
Knuckle spindle ................................................AX-9
KS - Wiring diagram .....................................EC-330
L
Length (Dimensions) .......................................GI-43
License lamp ...................................................EL-61
Lifting points ....................................................GI-47
Limited slip diff. adjustment ............................PD-50
Limited slip diff. assembly ..............................PD-51
Limited slip diff. disassembly..........................PD-48
Limited slip diff. inspection .............................PD-49
Line pressure solenoid valve ........AT-147, 161, 167
Line pressure switch (Transfer) .....................TF-111
Line pressure test (A/T) ..................................AT-62
Liquid gasket application .................................EM-3
LOAD - Wiring diagram ................................EC-643
Location of electrical units ............................EL-436
Lock, door .......................................................BT-18
Low and reverse brake .................................AT-324
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ALPHABETICAL INDEX
IDX-5

SMA010
2. Clean oil filter mounting surface on cylinder block. Coat rubber
seal of new oil filter with engine oil.
SMA702C
3. Screw in the oil filter until a slight resistance is felt, then tighten
an additional 2/3 turn.
4. Add engine oil.
Refer to MA-18, ªChanging Engine Oilº.
IClean excess oil from engine.
SMA098D
Changing Spark PlugsNBMA00171. Remove engine cover.
2. Remove throttle wires.
3. Remove air duct with air cleaner assembly.
4. Disconnect harness connectors and harness brackets around
ignition coil sides.
5. Remove throttle body. (Only when removing the No. 4 cylinder
spark plug)
6. Disconnect ignition coil harness connectors.
7. Loosen ignition coil fixing bolts and pull out coil from intake
manifold connector.
Ignition coil:
: 8.5 - 10.7 N´m (0.86 - 1.1 kg-m, 75 - 95 in-lb)
SEM294A
8. Check type and gap of new spark plug.
Spark plug type:
Symbol Make
Standard type PLFR5A-11 NGK
Cold type PLFR6A-11 NGK
Hot type PLFR4A-11 NGK
Gap (Nominal): 1.1 mm (0.043 in)
Spark plug:
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ENGINE MAINTENANCE
Changing Oil Filter (Cont'd)
MA-19

Precautions
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) ªAIR BAGº AND ªSEAT BELT
PRE-TENSIONERº
NBRS0001The Supplemental Restraint System such as ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS composition which is available to INFINITI QX4 is as follows:
IFor a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing wheel), front passenger air bag module (located on the instrument panel on passenger side), seat belt
pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.
IFor a side collision
The Supplemental Restraint System consists of side air bag module (located in the outer side of front seat),
satellite sensor, diagnosis sensor unit (one of components of air bags for a frontal collision), wiring harness,
warning lamp (one of components of air bags for a frontal collision).
WARNING:
ITo 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 performed
by an authorized INFINITI dealer.
IImproper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system.
IDo not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses covered with yellow insulation tape either just
before the harness connectors or for the complete harness are related to the SRS.
PRECAUTION FOR SEAT BELT SERVICENBRS0002CAUTION:
IBefore removing the seat belt pre-tensioner assembly, turn the ignition switch off, disconnect both
battery cables and wait at least 3 minutes.
IDo not use electrical test equipment for seat belt pre-tensioner connector.
IAfter replacing or reinstalling seat belt pre-tensioner assembly, or reconnecting seat belt pre-ten-
sioner connector, check the system function. Refer to ªSRS Operation Checkº (RS-38) for details.
IDo not use disassemble buckle or seat belt assembly.
IReplace anchor bolts if they are deformed or worn out.
INever oil tongue and buckle.
IIf any component of seat belt assembly is questionable, do not repair. Replace the whole seat belt
assembly.
IIf webbing is cut, frayed, or damaged, replace seat belt assembly.
IWhen replacing seat belt assembly, use a genuine seat belt assembly.
After A CollisionNBRS0002S01WARNING:
Inspect all seat belt assemblies including retractors and attaching hardware after any collision.
NISSAN recommends that all seat belt assemblies in use during a collision be replaced unless the
collision was minor and the belts show no damage and continue to operate properly. Failure to do so
could result in serious personal injury in an accident. Seat belt assemblies not in use during a colli-
sion should also be replaced if either damage or improper operation is noted. Seat belt pre-tensioner
should be replaced even if the seat belts are not in use during a frontal collision in which the air bags
are deployed.
Replace any seat belt assembly if:
IThe seat belt was in use at the time of a collision (except for minor collisions and the belts, retractors and
buckles show no damage and continue to operate properly).
IThe seat belt was damaged in an accident. (i.e. torn webbing, bent retractor or guide, etc.)
IThe seat belt attaching point was damaged in an accident. Inspect the seat belt attaching area for dam-
age or distortion and repair as necessary before installing a new seat belt assembly.
IAnchor bolts are deformed or worn out.
IThe seat belt pre-tensioner should be replaced even if the seat belts are not in use during the collision in
which the air bags are deployed.
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SEAT BELTS
Precautions
RS-3