2011 INFINITI QX56 engine

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< PERIODIC MAINTENANCE >
FUEL SYSTEM
PERIODIC MAINTENANCE
FUEL SYSTEM
InspectionINFOID:0000000006289682
• Inspect fuel lines, fuel filler cap and fuel tank for improper attach-ment, leakage, cracks, damage, loose connections, chafing or
deterioration.
 If necessary, repair or replace damaged parts.
Quick ConnectorINFOID:0000000006289683
CAUTION:
 After connecting fuel tube quick connectors, check quick con-
nectors are secure.
 Ensure that connector and resi n tube never contact any adja-
cent parts.
A : Engine
B : Fuel line
C: Fuel tank
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1 : Quick connector
2: Retainer
A : Hard tube (or the equivalent)
B : Connection (cross-section)
C : Resin tube
D : To under floor fuel line
E : To fuel tank
F: Tab
G : Disconnection
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Revision: 2010 May2011 QX56

FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY
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 To keep the connecting portio
n clean and to avoid dam-
age and foreign materials, cover them completely with
plastic bags (A) or something similar.
8. Remove lock ring for fuel level sensor unit, fuel filter and fuel pump assembly with fuel tank lock ring wrench [SST:
KV10119800 (J-45722)] (A) by turning counterclockwise.
9. Remove fuel level sensor unit, fuel filter and fuel pump assem- bly.
CAUTION:
 Never bend float arm during removal.
 Avoid impacts such as fa lling when handling compo-
nents.
INSTALLATION
Note to the following, and install in the reverse order of removal.
 For installation, use a new O-ring.
Quick Connector Connect quick connector as follows:
1. Check the connection for damage or any foreign materials.
2. Align the connector with the tube, then insert the connector straight into the tube until a click sound is
heard.
3. After connecting, check that the connection is secure by following method.  Pull the tube and the connector to check they are securely
connected.
 Visually confirm that the two retainer tabs are connected to the connector.
InspectionINFOID:0000000006289686
INSPECTION AFTER INSTALLATION
Use the following procedure to check for fuel leakage.
1. Turn ignition switch “ON” (with engine stopped), then check connections for leakage by applying fuel pres-
sure to fuel piping.
2. Start engine and let it idle and check there are no fuel leakage at the fuel system connections.
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JSBIA0384ZZ
A: Pull
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FUEL TANKFL-9
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3. Remove LH rear wheel and tire.
4. Disconnect fuel filler hose, vent hose and EVAP hose at fuel tank side.
5. Remove fuel tank protector.
6. Remove the fuel tank mounting band bolts while supporting the
fuel tank with a suitable lift jack.
CAUTION:
Support the position that fu el tank mounting bands never
engage.
7. Supporting with hands, descend suitable jack carefully, and remove fuel tank. CAUTION:
 Check that all connection po ints have been disconnected.
 Confirm there is no interference with vehicle.
InspectionINFOID:0000000006289689
INSPECTION AFTER INSTALLATION
Use the following procedure to check for fuel leakage.
1. Turn ignition switch “ON” (with engine stopped), and check connections for leakage by applying fuel pres-
sure to fuel piping.
2. Start engine and rev it up and check there are no f uel leakage at the fuel system tube and hose connec-
tions.
 After removing/installing rear suspension assembly, check to adjust wheel alignment. Refer to RSU-6,
"Inspection".
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Revision: 2010 May2011 QX56

FSU-2
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006271944
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty 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 w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISS AN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.
 Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
 When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s)
with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly
causing serious injury.
 When using air or electric power tools or hammers , always switch the ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation after Battery Disconnect
INFOID:0000000006271945
NOTE:
 Before removing and installing any control units, first tu rn the push-button ignition switch to the LOCK posi-
tion, then disconnect bot h battery cables.
 After finishing work, confirm that all control unit connectors are connected properly, then re-connect both
battery cables.
 Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If a DTC is detected, perform trouble diagnos is according to self-diagnosis results.
For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and
cannot be turned.
If turning the steering wheel is required with the bat tery disconnected or discharged, follow the operation pro-
cedure below before starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Turn the push-button ignition switch to ACC position. (At this time, the steering lock will be released.)
3. Disconnect both battery cables. The steering lock wi ll remain released with both battery cables discon-
nected and the steering wheel can be turned.
4. Perform the necessary repair operation.
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PRECAUTIONSFSU-3
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5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button ignition switch is turned to LOCK position.)
6. Perform self-diagnosis check of a ll control units using CONSULT-III.
Precaution for Procedure without Cowl Top CoverINFOID:0000000006271994
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
Precautions for SuspensionINFOID:0000000006225635
 When installing rubber bushings, the final tightening mu st be carried out under unladen conditions with tires
on ground. Spilled oil might shorten the life of rubb er bushings. Be sure to wipe off any spilled oil.
- Unladen conditions mean that fuel, engine coolant and l ubricant are full. Spare tire, jack, hand tools and
mats are in designated positions.
 After servicing suspension parts, be sure to check wheel alignment.
 Self-lock nuts are not reusable. Always use new ones w hen installing. Since new self-lock nuts are pre-oiled,
tighten as they are.
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Revision: 2010 May2011 QX56

WHEEL ALIGNMENTFSU-7
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WHEEL ALIGNMENT
InspectionINFOID:0000000006225640
DESCRIPTION
Measure wheel alignment under unladen conditions.
NOTE:
“Unladen conditions” means that fuel, engine coolant, and lubricant are full. Spare tire, jack, hand tools and
mats are in designated positions.
PRELIMINARY CHECK
Check the following:
 Tires for improper air pressure and wear
 Road wheels for runout: Refer to WT-64, "
Inspection".
 Wheel bearing axial end play: Refer to FA X - 7 , "
Inspection" (2WD), FAX-16, "Inspection" (4WD).
 Lower link and upper link ball joint axial end play: Refer to FSU-15, "
Inspection" and FSU-18, "Inspection".
 Shock absorber operation.
 Each mounting part of axle and suspension for looseness and deformation
 Lower link for cracks, deformation and other damage
 Vehicle height (posture)
GENERAL INFORMATION AND RECOMMENDATIONS
 A four-wheel thrust alignment should be performed.
- This type of alignment is recomm ended for any NISSAN/INFINITI vehicle.
- The four-wheel “thrust” process helps ensure that t he vehicle is properly aligned and the steering wheel is
centered.
- The alignment rack itself should be capable of accepting any NISSAN/INFINITI vehicle.
- The rack should be checked to ensure that it is level.
 Make sure the machine is properly calibrated.
- Your alignment equipment should be regularly ca librated in order to give correct information.
- Check with the manufacturer of your specific equi pment for their recommended Service/Calibration Sched-
ule.
ALIGNMENT PROCESS
IMPORTANT:
Use only the alignment specificati ons listed in this Service Manual.
 When displaying the alignment settings, many alignment machines use “indicators”: (Green/red, plus or
minus, Go/No Go). Never use these indicators.
- The alignment specifications programmed into your machine that operate these indicators may not be cor-
rect.
- This may result in an ERROR.
 Some newer alignment machines are equipped with an optional “Rolling Compensation” method to “com-
pensate” the sensors (alignment targets or head units). Never use this “Rolling Compensation” method.
- Use the “Jacking Compensation Method”. After installi ng the alignment targets or head units, raise the vehi-
cle and rotate the wheels 1/2 turn both ways.
- See Instructions in the alignment machine you're using for more information on this.
AdjustmentINFOID:0000000006225641
CAMBER, CASTER
1. Adjust with the front/rear side adjusting bolts (1) on the lower link
(2).
2. See the following table for the amount of cam bolt scale move- ment and the variation of camber and caster.
CAUTION:
Align the adjusting bolt cutout with the stamp of lower link
bracket.
: Vehicle front
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Revision: 2010 May2011 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)
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SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Wheel AlignmentINFOID:0000000006225652
*1: The minimum value and maximum value is the same as the nominal value.
Measure value under unladen
*2 conditions.
*2: Fuel, engine coolant and lubricant are full. Spare tire, jack, hand tools and mats are in designated positions.
Ball JointINFOID:0000000006225653
Wheel HeightINFOID:0000000006225654
Item Standard
Measurement wheel Left side Right side
Camber
Degree minute (Decimal degree) Minimum
−0 °45 ′ ( −0.75 °) −0°55 ′ ( −0.91 °)
Nominal 0 ° 00 ′ (0.00 °) −0°10 ′ ( −0.17 °)
Maximum 0 ° 45 ′ (0.75 °)0 ° 35 ′ (0.58 °)
Left and right difference 0 ° 33 ′ (0.55 °) or less
Caster
Degree minute (Decimal degree) Minimum 2
° 20 ′ (2.34 °)2 ° 40 ′ (2.67 °)
Nominal 3 ° 05 ′ (3.08 °)3 ° 25 ′ (3.42 °)
Maximum 3 ° 50 ′ (3.83 °)4 ° 10 ′ (4.16
° )
Left and right difference 0 ° 45 ′ (0.75 °) or less
Kingpin inclination
Degree minute (Decimal degree) Minimum — —
Nominal
13° 20 ′ (13.33 °)
*113 ° 25 ′ (13.42 °)*1
Maximum — —
To e - i n To t a l t o e - i n
Distance
Minimum In 1.4 mm (0.055 in)
Nominal In 2.4 mm (0.094 in)
Maximum In 3.4 mm (0.134 in)
Toe angle (left wheel or right
wheel)
Degree minute (Decimal degree) Minimum In 0
° 03 ′ (0.05 °)
Nominal In 0 ° 05 ′ (0.08 °)
Maximum In 0 ° 07 ′ (0.11 °)
Item Standard
Swing torque Lower link 0.5 – 6.4 N·m (0.06 – 0.65 kg-m, 5 – 56 in-lb)
Upper link 0.5 – 4.9 N·m (0.06 – 0.49 kg-m, 5 – 43 in-lb)
Measurement on spring balance (groove position) Lower link 11.4 – 145.4 N (1.17 – 14.83 kg, 2.57 – 32.68 lb)
Measurement on spring balance (cotter pin hole position) Upper link 8.1 – 79.0 N (0.83 – 8.05 kg, 1.83 – 17.75 lb)
Rotating torque Lower link 0.5 – 6.4 N·m (0.06 – 0.65 kg-m, 5 – 56 in-lb)
Upper link 0.5 – 4.9 N·m (0.06 – 0.49 kg-m, 5 – 43 in-lb)
Axial end play 0 mm (0 in)
Item Standard
Front (Hf) 903 mm (35.55 in)
Revision: 2010 May2011 QX56

FSU-22
< SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Measure value under unladen* conditions.
*: Fuel, engine coolant and lubricant are full. Spare tire, jack, hand tools and mats are in designated positions.Rear (Hr) 890 mm (35.04 in)
Item Standard
SFA746B
Revision: 2010 May2011 QX56