2004 INFINITI QX56 Electric

INTAKE MANIFOLD
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Revision: August 20072004 QX56
INSTALLATION
Installation is in the reverse order of removal.

Tighten the intake manifold bolts in numerical order as shown.

Install the EVAP canister purge control solenoid valve connector with it facing front of engine.

Tighten the electronic throttle control actuator bolts of the electric throttle control actuator equally and
diagonally in several steps.

After installation perform procedure in EM-18, "INSPECTION AFTER INSTALLATION" .

Install the water hose so that its overlap width for connection is between 27 mm (1.06 in) and 32 mm (1.26
in) (target: 27 mm 1.06 in).
Connecting Quick Connector of Fuel Tube
Install quick connector as follows (the steps are the same for quick connectors on both engine side and vehi-
cle side except for the quick connector cap).
1. Make sure no foreign substances are deposited in and around tube and quick connector, and they are not
damaged.
2. Thinly apply new engine oil around the fuel tube from tip end to the spool end.
3. Align center to insert quick connector straight into fuel tube.

Insert until the paint mark for engagement identification
(white) goes completely inside quick connector so that you
cannot see it from the straight side of the connected part. Use
a mirror to check this where it is not possible to view directly
from the straight side, such as quick connector on vehicle
side.

Insert fuel tube into quick connector until top spool is com-
pletely inside quick connector, and 2nd level spool exposes
right below quick connector on engine side.
CAUTION:

Hold A position in illustration when inserting fuel tube
into quick connector.

Carefully align center to avoid inclined insertion to pre-
vent damage to O-ring inside quick connector.

Insert until you hear a “click” sound and actually feel
the engagement.

To avoid misidentification of engagement with a similar
sound, be sure to perform the next step.
4. Pull quick connector by hand holding A position. Make sure it is completely engaged (connected) so that it
does not come out from fuel tube.
NOTE:
Recommended pulling force is 50 N (5.1 kg, 11.2 lb).
KBIA2462E
PBIC0017E
KBIA0272E

EM-18Revision: August 2007
INTAKE MANIFOLD
2004 QX56
5. Install the quick connector cap on the quick connector joint (on
engine side only).
6. Install the fuel hose and tube to hose clamps.
7. Refill the engine coolant. Refer to MA-13, "
REFILLING ENGINE
COOLANT" .
INSPECTION AFTER INSTALLATION

After installing fuel tubes, make sure there is no fuel leakage at connections in the following steps.
–Apply fuel pressure to fuel lines with turning ignition switch ON (with engine stopped). Then check for
fuel leaks at connections.
–Start the engine and rev it up and check for fuel leaks at connections.

Perform procedures for “Throttle Valve Closed Position Learning” after finishing repairs. Refer to EC-44,
"Throttle Valve Closed Position Learning" .

If electric throttle control actuator is replaced, perform procedures for “Idle Air Volume Learning” after fin-
ishing repairs. Refer to EC-44, "
Idle Air Volume Learning" .
SBIA0354E

ROCKER COVER
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ROCKER COVERPFP:13264
Removal and InstallationEBS00ILL
REMOVAL
1. Remove the engine room cover using power tool. Refer to EM-11, "REMOVAL" .
2. Remove the air duct and resonator assembly. Refer to EM-14, "
REMOVAL" (for left bank only) .
3. Move the harness on the upper rocker cover and its peripheral aside.
4. Remove the electric throttle control actuator, loosening bolts diagonally (for left bank only).
5. Remove the ignition coil. Refer to EM-26, "
REMOVAL" .
6. Remove the PCV hose from the PCV control valve.
7. Loosen the bolts in reverse order shown using power tool.
CAUTION:
Do not hold the rocker cover by the oil filler neck (right
bank).
1. Rocker cover (left bank) 2. PCV control valve 3. O-ring
4. Rocker cover gasket (left bank) 5. Rocker cover (right bank) 6. PCV control valve
7. O-ring 8. Oil filler cap 9. Rocker cover gasket (right bank)
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FL-6Revision: August 2007
FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY
2004 QX56
d. Disconnect the fuel filler hose from the fuel filler pipe.
e. Insert a suitable hose into the fuel tank through the fuel filler hose to drain the fuel from the fuel tank.

As a guide, the fuel level reaches the fuel gauge position as shown, or less, when approximately 14
liters (3 3/4 US gal, 3 1/8 Imp gal) of fuel are drained from the fuel tank.
3. Release the fuel pressure from the fuel lines. Refer to EC-46, "
FUEL PRESSURE RELEASE" .
4. Remove the second row LH rear seat and the third row rear seat. Refer to SE-103, "
REAR SEAT" .
5. Remove the second and third row rear seat belt buckles mounted on the floor. Refer to SB-3, "
SEAT
BELTS" .
6. Remove the LH center pillar trim, the LH rear trim panel, and the LH rear side door kick plate and weather
stripping. Refer to EI-34, "
BODY SIDE TRIM" .
7. Remove the second row rear center console and base, if equipped. Refer to EI-36, "
FLOOR TRIM" .
8. Reposition the floor carpet out of the way to access the inspection hole cover, located under the center LH
rear seat.
9. Remove the inspection hole cover by turning the retainers 90°
degrees clockwise.

Remove the O-ring.
10. Disconnect the fuel level sensor, fuel filter, and fuel pump
assembly electrical connector, the EVAP hose, and the fuel feed
hose.
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FUEL TANK
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13. Remove the inspection hole cover by turning the retainers 90°
degrees clockwise.

Remove the O-ring.
14. Disconnect the fuel level sensor, fuel filter, and fuel pump
assembly electrical connector, the EVAP hose, and the fuel feed
hose.
Disconnect the quick connector as follows:

Hold the sides of the connector, push in tabs and pull out the
tube.

If the connector and the tube are stuck together, push and pull
several times until they start to move. Then disconnect them
by pulling.
LBIA0382E
LBIA0383E
SF E5 62 A

GI-1
GENERAL INFORMATION
A GENERAL INFORMATION
CONTENTS
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SECTION GI
Revision: August 20072004 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 Premium Gasoline
Required) ................................................................. 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
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 ........................................................... 10
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 - ......... 16DESCRIPTION .................................................... 17
Abbreviations .......................................................... 22
SERVICE INFORMATION FOR ELECTRICAL INCI-
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
SMJ INSTALLATION ........................................... 36
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

PRECAUTIONS
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PRECAUTIONSPFP:00001
DescriptionEAS00146
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”
EAS00147
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.
WA RN ING:

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)
EAS001QV
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.

GI-4
PRECAUTIONS
Revision: August 20072004 QX56
General PrecautionsEAS00148

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 flammable
materials. Special care should be taken when handling any flam-
mable or poisonous materials, such as gasoline, refrigerant gas,
etc. When working in a pit or other enclosed area, be sure to
properly ventilate the area before working with hazardous mate-
rials.
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.

Battery posts, terminals and related accessories contain lead
and lead compounds. Wash hands after handling.

To prevent serious burns:
Avoid contact with hot metal parts.
Do not remove the radiator cap when the engine is hot.

Dispose of or recycle 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
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