This document provides precautions and general information for servicing a 2005 Infiniti QX56, including: - Precautions for supplemental restraint systems, vehicle immobilizers, three-way catalysts, fuels, and hoses. - How to use the service manual terms, contents, symbols, and wiring diagrams. - How to perform efficient electrical diagnosis, including incident simulation tests and circuit inspection. - Information on the CONSULT-II diagnostic system, lifting points, towing, and standard bolt tightening torques.

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QUICK REFERENCE INDEX
A GENERAL INFORMATION GI General Information
B ENGINE EM Engine Mechanical
LU Engine Lubrication System
CO Engine Cooling System
EC Engine Control System
FL Fuel System
EX Exhaust System
ACC Accelerator Control System
C TRANSMISSION/
TRANSAXLE
AT Automatic Transmission
D DRIVELINE/AXLE TF Transfer
PR Propeller Shaft
FFD Front Final Drive
RFD Rear Final Drive
FAX Front Axle
RAX Rear Axle
E SUSPENSION FSU Front Suspension
RSU Rear Suspension
WT Road Wheels & Tires
F BRAKES BR Brake System
PB Parking Brake System
BRC Brake Control System
G STEERING PS Power Steering System
H RESTRAINTS SB Seat Belts
SRS Supplemental Restraint System (SRS)
I BODY BL Body, Lock & Security System
GW Glasses, Window System & Mirrors
RF Roof
EI Exterior & Interior
IP Instrument Panel
SE Seat
AP Adjustable Pedal
J AIR CONDITIONER ATC Automatic Air Conditioner
K ELECTRICAL SC Starting & Charging System
LT Lighting System
DI Driver Information System
WW Wiper, Washer & Horn
BCS Body Control System
LAN LAN System
AV Audio Visual, Navigation & Telephone System
ACS Auto Cruise Control System
PG Power Supply, Ground & Circuit Elements
L MAINTENANCE MA Maintenance
M INDEX IDX Alphabetical Index
Edition: October 2004
Revision: October 2005
Publication No. SM5E-1J60U1
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© 2005 NISSAN NORTH AMERICA, INC.
All rights reserved. No part of this Service Manual may be reproduced or stored in a retrieval system, or transmitted in any
form, or by any means, electronic, mechanical, photo-copying, recording or otherwise, without the prior written permission
of Nissan North America, Inc., Gardena, California.
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This manual contains maintenance and repair procedures for the
2005 INFINITI QX56.
In order to assure your safety and the efficient functioning of the vehicle,
this manual should be read thoroughly. It is especially important that the
PRECAUTIONS in the GI section be completely understood before starting
any repair task.
All information in this manual is based on the latest product information
at the time of publication. The right is reserved to make changes in specifi-
cations and methods at any time without notice.
IMPORTANT SAFETY NOTICE
The proper performance of service is essential for both the safety of
the technician and the efficient functioning of the vehicle.
The service methods in this Service Manual are described in such a
manner that the service may be performed safely and accurately.
Service varies with the procedures used, the skills of the technician
and the tools and parts available. Accordingly, anyone using service
procedures, tools or parts which are not specifically recommended
by NISSAN must first be completely satisfied that neither personal
safety nor the vehicle’s safety will be jeopardized by the service
method selected.

3. QUICK REFERENCE CHART: QX56 2005
QUICK REFERENCE CHART: QX56 PFP:00000
Engine Tune-Up Data ELS001U4
Cylinder arrangement V-8
Displacement 5,552 cm3
(338.80 in3
)
Bore and stroke 98 x 92 mm (3.86 x 3.62 in)
Valve arrangement DOHC
Firing order 1-8-7-3-6-5-4-2
Number of piston rings
Compression 2
Oil 1
Number of main bearings 5
Compression ratio 9.8:1
Compression pressure
Standard 1,520 kPa (15.5 kg/cm2
, 220 psi) / 200 rpm
Minimum 1,324 kPa (13.5 kg/cm2 , 192 psi) / 200 rpm
Differential limit between cylinders 98 kPa (1.0 kg/cm2 , 14 psi) / 200 rpm
Cylinder number
Valve timing
Unit: degree
a b c d e f
232° 230° 2° 48° 3° 49°
SEM957C
PBIC0187E

4. 2005
QUICK REFERENCE CHART: QX56
Drive Belt Deflection and Tension
Spark Plugs (Double Platinum Tipped)
Front Wheel Alignment (Unladen*1 )*6 ELS001U5
*1: Fuel, radiator coolant and engine oil full. Spare tire, jack, hand tools and mats in designated positions.
*2: Target value 37° 31′ (37.52°)
*3: Target value 33° 59′ (33.98°)
*4: Target value 37° 44′ (37.73°)
*5: Target value 33° 29′ (33.48°)
*6: Some vehicles may be equipped with straight (non-adjustable) lower link bolts and washers. In order to adjust camber and caster on
these vehicles, first replace the lower link bolts and washers with adjustable (cam) bolts and washers.
Tension of drive belts Auto adjustment by auto tensioner
Make NGK
Standard type PLFR5A-11
Hot type PLFR4A-11
Cold type PLFR6A-11
Gap (nominal) 1.1 mm (0.043 in)
Drive type 4x2 4x4
Camber
Degree minute (decimal degree)
Minimum -0° 51′ (-0.85°) -0° 33′ (-0.55°)
Nominal -0° 6′ (-0.10°) 0° 12′ (0.20°)
Maximum 0° 39′ (0.65°) 0° 57′ (0.95°)
Cross camber 0° 45′ (0.75°) or less 0° 45′ (0.75°) or less
Caster
Degree minute (decimal degree)
Minimum 3° 15′ (3.25°) 2° 45′ (2.75°)
Nominal 4° 0′ (4.00°) 3° 30′ (3.50°)
Maximum 4° 45′ (4.75°) 4° 15′ (4.25°)
Cross caster 0° 45′ (0.75°) or less 0° 45′ (0.75°) or less
Kingpin inclination
Degree minute (decimal degree)
13° 32′ (13.53°) 13° 13′ (13.22°)
Total toe-in
Distance (A − B)
Minimum 1.8 mm (0.07 in) 1.8 mm (0.07 in)
Nominal 2.8 mm (0.11 in) 2.8 mm (0.11 in)
Maximum 3.8 mm (0.15 in) 3.8 mm (0.15 in)
Angle (left side and right side)
Degree minute (decimal degree)
Minimum 0° 3′ (0.05°) 0° 3′ (0.05°)
Nominal 0° 5′ (0.08°) 0° 5′ (0.08°)
Maximum 0° 7′ (0.12°) 0° 7′ (0.12°)
Wheel turning angle
(full turn)
Inside
Degree minute (decimal degree)
34° 31′ – 38° 31′ *2
(34.52° – 38.52°)
34° 44′ – 38° 44′ *4
(34.73° – 38.73°)
Outside
Degree minute (decimal degree)
30° 59′ – 34° 59′ *3
(30.98° – 34.98°)
30° 29′ – 34° 29′ *5
(30.48° – 34.48°)
SFA234AC

5. QUICK REFERENCE CHART: QX56
2005
Rear Wheel Alignment ELS001U6
Brake ELS001U7
Unit: mm (in)
Camber
Degree minute (decimal degree)
Minimum 0° 0′ (0°)
Nominal - 0° 30′ (-0.5°)
Maximum - 1° 0′ (-1.0°)
Cross camber 0° 45′ (0.75°)
Toe-in
Distance (A - B)
Minimum 0 mm (0 in)
Nominal 3.3 mm (0.130 in)
Maximum 6.6 mm (0.260 in)
Cross toe 2 mm (0.079 in)
Angle (left, right)
Degree minute (decimal
degree)
Minimum 0° 0′ (0°)
Nominal 0° 7′ (0.11°)
Maximum 0° 14′ (0.22°)
Cross toe 0° 8′ (0.14°)
SFA234AC
Front brake Brake model CLZ31VC
Rotor outer diameter × thickness 320 × 26 (12.60 × 1.02)
Pad Length × width × thickness 111.0 × 73.5 × 9.5 (4.73 × 2.894 × 0.374)
Cylinder bore diameter 51 (2.01)
Rear brake Brake model AD14VE
Rotor outer diameter × thickness 320 × 14 (12.60 × 0.55)
Pad Length × width × thickness 83.0 × 33.0 × 8.5 (3.268 × 1.299 × 0.335)
Cylinder bore diameter 48 (1.89)
Control valve Valve model Electric brake force distribution
Brake booster Booster model C215T
Diaphragm diameter 215 (8.46)
Recommended brake fluid
Genuine NISSAN Super Heavy Duty Brake Fluid or equivalent,
DOT 3 (US FMVSS No. 116)

6. 2005
QUICK REFERENCE CHART: QX56
Disc Brake - Repair Limits ELS001U8
Unit: mm (in)
Brake Pedal ELS001U9
Unit: mm (in)
Refill Capacities ELS001UA
Brake model CLZ31VC (Front) AD14VE (Rear)
Brake Pad
Standard thickness (new) 11.88 (0.468) 12.13 (0.478)
Repair limit thickness 1.0 (0.039) 1.0 (0.039)
Disc rotor
Standard thickness (new) 26.0 (1.024) 14.0 (0.551)
Repair limit thickness 24.5 (0.965) 12.0 (0.472)
Maximum uneven wear (measured at 8 positions) 0.015 (0.0006) 0.015 (0.0006)
Runout limit (with it attached to the vehicle) 0.04 (0.0016) 0.05 (0.0020)
Brake pedal height (from dash panel top surface) 182.3 − 192.3 (7.18 − 7.57)
Depressed pedal height [under a force of 490 N (50 kg, 110 lb) with engine running] More than 90.3 (3.55)
Clearance between stopper rubber and the threaded end of stop lamp switch 0.74 − 1.96 (0.029 − 0.077)
Pedal play 3 − 11 (0.12 − 0.43)
Description
Capacity (Approximate)
Metric US measure Imp measure
Fuel 105.8 28 US gal 23 1/4 Imp gal
Engine oil
Drain and refill
With oil filter change 6.2 6 1/2 qt 5 1/2 qt
Without oil filter change 5.9 6 1/4 qt 5 1/4 qt
Dry engine (engine overhaul) 7.6 8 qt 6 3/4 qt
Cooling system With reservoir at MAX level 14.4 3 3/4 gal 3 1/8 gal
Automatic transmission fluid (ATF) 10.6 11 1/4 qt 9 3/8 qt
Rear final drive oil 1.75 3 3/4 pt 3 1/8 pt
Transfer fluid 3.0 3 1/8 qt 2 5/8 qt
Front final drive oil 1.6 3 3/8 pt 2 7/8 pt
Power steering fluid (PSF) 1.0 2 1/8 pt 1 3/4 pt
Windshield washer fluid 4.5 1 1/4 gal 1 gal
Air conditioning system refrigerant 1.08 ± 0.05 kg 2.38 ± 0.11 lb 2.38 ± 0.11 lb
Air conditioning system lubricants 290 m 9.8 fl oz 10.2 fl oz

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8. GI-1
GENERAL INFORMATION
A GENERAL INFORMATION
CONTENTS
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SECTION GI
Revision: October 2005 2005 QX56
PRECAUTIONS .....................................................
..... 3
Description ..........................................................
..... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .............................................................
..... 3
Precautions for NVIS/IVIS (NISSAN/INFINITI
VEHICLE IMMOBILIZER SYSTEM - NATS) (If
Equipped) ............................................................
..... 3
General Precautions ...........................................
..... 4
Precautions for Three Way Catalyst ....................
..... 5
Precautions for Fuel (Unleaded Regular Gasoline
Recommended) ...................................................
..... 5
Precautions for Multiport Fuel Injection System or
Engine Control System .......................................
..... 6
Precautions for Hoses .........................................
..... 6
HOSE REMOVAL AND INSTALLATION ..........
..... 6
HOSE CLAMPING ...........................................
..... 6
Precautions for Engine Oils .................................
..... 7
HEALTH PROTECTION PRECAUTIONS ........
..... 7
ENVIRONMENTAL PROTECTION PRECAU-
TIONS ..............................................................
..... 7
Precautions for Air Conditioning ..........................
..... 7
HOW TO USE THIS MANUAL ..............................
..... 8
Description ..........................................................
..... 8
Terms ..................................................................
..... 8
Units ....................................................................
..... 8
Contents ..............................................................
..... 8
Relation between Illustrations and Descriptions .
..... 9
Components ........................................................
..... 9
SYMBOLS ........................................................
... 10
How to Follow Trouble Diagnoses .......................
....11
DESCRIPTION .................................................
....11
HOW TO FOLLOW TEST GROUPS IN TROU-
BLE DIAGNOSES ............................................
....11
HARNESS WIRE COLOR AND CONNECTOR
NUMBER INDICATION ....................................
... 12
KEY TO SYMBOLS SIGNIFYING MEASURE-
MENTS OR PROCEDURES ............................
... 13
How to Read Wiring Diagrams ............................
... 15
CONNECTOR SYMBOLS ................................
... 15
SAMPLE/WIRING DIAGRAM - EXAMPL - .......
... 16
DESCRIPTION .................................................
... 17
Abbreviations .......................................................
... 22
SERVICE INFORMATION FOR ELECTRICALINCI-
DENT ......................................................................
... 24
How to Check Terminal ........................................
... 24
CONNECTOR AND TERMINAL PIN KIT .........
... 24
HOW TO PROBE CONNECTORS ...................
... 24
How to Perform Efficient Diagnosis for an Electrical
Incident ................................................................
... 27
WORK FLOW ...................................................
... 27
INCIDENT SIMULATION TESTS .....................
... 27
CIRCUIT INSPECTION ....................................
... 30
Control Units and Electrical Parts ........................
... 35
PRECAUTIONS ...............................................
... 35
CONSULT-II CHECKING SYSTEM .......................
... 37
Description ...........................................................
... 37
Function and System Application ........................
... 37
Nickel Metal Hydride Battery Replacement .........
... 38
Checking Equipment ...........................................
... 38
CONSULT-II Start Procedure ...............................
... 38
CONSULT-II Data Link Connector (DLC) Circuit .
... 39
INSPECTION PROCEDURE ...........................
... 39
LIFTING POINT ......................................................
... 40
Pantograph Jack ..................................................
... 40
Garage Jack and Safety Stand ............................
... 40
2-Pole Lift ............................................................
... 41
TOW TRUCK TOWING ..........................................
... 42
Tow Truck Towing ................................................
... 42
2WD MODELS .................................................
... 42
4WD MODELS .................................................
... 43
Vehicle Recovery (Freeing a stuck vehicle) .........
... 43
TIGHTENING TORQUE OF STANDARD BOLTS .
... 44
Tightening Torque Table ......................................
... 44
RECOMMENDED CHEMICAL PRODUCTS AND
SEALANTS ............................................................
... 45
Recommended Chemical Products and Sealants... 45
IDENTIFICATION INFORMATION .........................
... 46
Model Variation ....................................................
... 46
Identification Number ...........................................
... 47

9. GI-2
Revision: October 2005 2005 QX56
VEHICLE IDENTIFICATION NUMBER
ARRANGEMENT ..............................................
... 47
ENGINE SERIAL NUMBER .............................
... 48
TRANSFER SERIAL NUMBER ........................
... 48
AUTOMATIC TRANSMISSION NUMBER ........
... 48
Dimensions ..........................................................
...49
Wheels & Tires .....................................................
...49
TERMINOLOGY .....................................................
...50
SAE J1930 Terminology List ................................
...50

10. PRECAUTIONS
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Revision: October 2005 2005 QX56
PRECAUTIONS PFP:00001
Description EAS001F5
Observe the following precautions to ensure safe and proper servicing. These precautions are not
described in each individual section.
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER” EAS001F6
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:
● To 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 per-
formed by an authorized NISSAN/INFINITI dealer.
● Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
● Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for NVIS/IVIS (NISSAN/INFINITI VEHICLE IMMOBILIZER SYSTEM -
NATS) (If Equipped) EAS001XP
NVIS/IVIS (NATS) will immobilize the engine if someone tries to start it without the registered key of NVIS/IVIS
(NATS).
Both of the originally supplied ignition key IDs have been NVIS/IVIS (NATS) registered.
The security indicator is located on the instrument panel. The indicator blinks when the immobilizer system is
functioning.
Therefore, NVIS/IVIS (NATS) warns outsiders that the vehicle is equipped with the anti-theft system.
● When NVIS/IVIS (NATS) detects trouble, the security indicator lamp lights up while ignition switch is in
"ON" position.
This lighting up indicates that the anti-theft is not functioning, so prompt service is required.
● When servicing NVIS/IVIS (NATS) (trouble diagnoses, system initialization and additional registration of
other NVIS/IVIS (NATS) ignition key IDs), CONSULT-II hardware and CONSULT-II NVIS/IVIS (NATS)
software is necessary.
Regarding the procedures of NVIS/IVIS (NATS) initialization and NVIS/IVIS (NATS) ignition key ID regis-
tration, refer to CONSULT-II operation manual, NVIS/IVIS (NATS).
Therefore, CONSULT-II NVIS/IVIS (NATS) software (program card and operation manual) must be kept
strictly confidential to maintain the integrity of the anti-theft function.
● When servicing NVIS/IVIS (NATS) (trouble diagnoses, system initialization and additional registration of
other NVIS/IVIS (NATS) ignition key IDs), it may be necessary to re-register original key identification.
Therefore, be sure to receive all keys from vehicle owner. A maximum of four or five key IDs can be regis-
tered into NVIS/IVIS (NATS).
● When failing to start the engine first time using the key of NVIS/IVIS (NATS), start as follows.
1. Leave the ignition key in "ON" position for approximately 5 seconds.
2. Turn ignition key to "OFF" or "LOCK" position and wait approximately 5 seconds.
3. Repeat step 1 and 2 again.
4. Restart the engine while keeping the key separate from any others on key-chain.

11. GI-4
PRECAUTIONS
Revision: October 2005 2005 QX56
General Precautions EAS001F7
● Do not operate the engine for an extended period of time without
proper exhaust ventilation.
Keep the work area well ventilated and free of any inflammable
materials. Special care should be taken when handling any
inflammable or poisonous materials, such as gasoline, refriger-
ant gas, etc. When working in a pit or other enclosed area, be
sure to properly ventilate the area before working with hazard-
ous materials.
Do not smoke while working on the vehicle.
● Before jacking up the vehicle, apply wheel chocks or other tire
blocks to the wheels to prevent the vehicle from moving. After
jacking up the vehicle, support the vehicle weight with safety
stands at the points designated for proper lifting before working
on the vehicle.
These operations should be done on a level surface.
● When removing a heavy component such as the engine or tran-
saxle/transmission, be careful not to lose your balance and drop
them. Also, do not allow them to strike adjacent parts, especially
the brake tubes and master cylinder.
● Before starting repairs which do not require battery power:
Turn off ignition switch.
Disconnect the negative battery terminal.
● If the battery terminals are disconnected, recorded memory of
radio and each control unit is erased.
● To prevent serious burns:
Avoid contact with hot metal parts.
Do not remove the radiator cap when the engine is hot.
● Dispose of drained oil or the solvent used for cleaning parts in
an appropriate manner.
● Do not attempt to top off the fuel tank after the fuel pump nozzle
shuts off automatically.
Continued refueling may cause fuel overflow, resulting in fuel
spray and possibly a fire.
● Clean all disassembled parts in the designated liquid or solvent
prior to inspection or assembly.
● Replace oil seals, gaskets, packings, O-rings, locking washers, cotter pins, self-locking nuts, etc. with new
ones.
● Replace inner and outer races of tapered roller bearings and needle bearings as a set.
● Arrange the disassembled parts in accordance with their assembled locations and sequence.
● Do not touch the terminals of electrical components which use microcomputers (such as ECM).
Static electricity may damage internal electronic components.
● After disconnecting vacuum or air hoses, attach a tag to indicate the proper connection.
● Use only the fluids and lubricants specified in this manual.
SGI285
SGI231
SEF289H
SGI233

12. PRECAUTIONS
GI-5
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Revision: October 2005 2005 QX56
● Use approved bonding agent, sealants or their equivalents when required.
● Use hand tools, power tools (disassembly only) and recom-
mended special tools where specified for safe and efficient ser-
vice repairs.
● When repairing the fuel, oil, water, vacuum or exhaust systems,
check all affected lines for leaks.
● Before servicing the vehicle:
Protect fenders, upholstery and carpeting with appropriate cov-
ers.
Take caution that keys, buckles or buttons do not scratch paint.
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 disconnected only when working according to the WORK FLOW of
TROUBLE DIAGNOSES in EC and AT sections.
Precautions for Three Way Catalyst EAS001F8
If a large amount of unburned fuel flows into the catalyst, the catalyst temperature will be excessively high. To
prevent this, follow the instructions.
● Use unleaded gasoline only. Leaded gasoline will seriously damage the three way catalyst.
● When checking for ignition spark or measuring engine compression, make tests quickly and only when
necessary.
● Do not run engine when the fuel tank level is low, otherwise the engine may misfire, causing damage to
the catalyst.
Do not place the vehicle on flammable material. Keep flammable material off the exhaust pipe and the three
way catalyst.
Precautions for Fuel (Unleaded Regular Gasoline Recommended) EAS001XQ
Use unleaded regular gasoline with an octane rating of at least 87 AKI (Anti-Knock Index) number (Research
octane number 91). E-85 fuel (85% fuel ethanol, 15% unleaded gasoline) may only be used in vehicles specif-
ically designed for E-85 fuel (i.e. Flexible Fuel Vehicle - FFV models.)
CAUTION:
Do not use leaded gasoline. Using leaded gasoline will damage the three way catalyst. Do not use E-85
fuel (85% fuel ethanol, 15% unleaded gasoline) unless the vehicle is specifically designed for E-85 fuel
(i.e. Flexible Fuel Vehicle - FFV Models). Using a fuel other than that specified could adversely affect
the emission control devices and systems, and could also affect the warranty coverage validity.
PBIC0190E
SGI234