2008 INFINITI QX56 fuel tank removal

MWI
FUEL LEVEL SENSOR SIGNAL CIRCUITMWI-33
< COMPONENT DIAGNOSIS >
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FUEL LEVEL SENSOR SIGNAL CIRCUIT
DescriptionINFOID:0000000001691293
The fuel level sensor unit and fuel pump detects the approx imate fuel level in the fuel tank and transmits the
fuel level signal to the combination meter.
Component Function CheckINFOID:0000000001691294
1.COMBINATION METER INPUT SIGNAL
1. Select “METER/M&A” on CONSULT-III.
2. Using “FUEL METER” of “DATA MONITOR”, comp are the value of DATA MONITOR with fuel gauge
pointer of combination meter.
Does the data monitor value approximately match the fuel gauge indication?
YES >> Inspection End.
NO >> Replace combination meter. Refer to MWI-76, "
Removal and Installation".
Diagnosis ProcedureINFOID:0000000001691295
1.CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Check combination meter and fuel level sensor unit terminals (meter-side and harness-side) for poor con- nection.
Is the inspection result normal?
YES >> GO TO 2
NO >> Repair or replace terminals or connectors.
2.CHECK FUEL LEVEL SENSOR UNIT CIRCUIT
1. Disconnect combination meter connector and fuel level sensor unit connector.
2. Check continuity between combination meter harness connector
(B) and fuel level sensor unit and fuel pump harness connector
(A).
3. Check continuity between fuel level sensor unit and fuel pump harness connector (A) and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair harness or connector.
Fuel gauge pointer Reference value of data monitor [lit.]
Full Approx. 93
3/4 Approx. 73
1/2 Approx. 52
1/4 Approx. 30
Empty Approx. 11
AB
Continuity
Connector Terminal Connector Terminal
C5 2 M24 3 Yes
A GroundContinuity
Connector Terminal
C5 2 No
AWNIA0206ZZ
Revision: March 2010 2008 QX56

MWI-34
< COMPONENT DIAGNOSIS >
FUEL LEVEL SENSOR SIGNAL CIRCUIT
3.CHECK FUEL LEVEL SENSOR UNIT GROUND CIRCUIT
1. Check continuity between combination meter harness connector (B) and fuel level sensor uni t and fuel pump harness connector
(A).
2. Check continuity between fuel level sensor unit and fuel pump harness connector (A) and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair harness or connector.
4.CHECK INSTALLATION CONDITION
Check fuel level sensor unit installation, and check whether the float arm interferes or binds with any of the
internal components in the fuel tank.
Is the inspection result normal?
YES >> Inspection End.
NO >> Install the fuel level sensor unit properly.
Component InspectionINFOID:0000000001691296
1.REMOVE FUEL LEVEL SENSOR UNIT
Remove the fuel level sensor unit. Refer to FL-7, "
Removal and Installation".
>> GO TO 2
2.CHECK FUEL LEVEL SENSOR UNIT AND FUEL PUMP
Check the resistance between terminals 2 and 5.
*1 and *2: When float arm is in contact with stopper.
Is inspection result normal?
YES >> Inspection End.
NO >> Replace fuel level sensor unit and fuel pump. Refer to FL-7, "
Removal and Installation".
AB Continuity
Connector Terminal Connector Terminal
C5 5 M24 4 Yes
A GroundContinuity
Connector Terminal
C5 5 No
AWNIA0207ZZ
Te r m i n a l Float position
mm (in) Resistance value
(Approx.)
25 *1 Empty
7.5 (0.3)80Ω
*2 Full 218.9 (8.6)6Ω
LKIA0402E
Revision: March 2010 2008 QX56

MWI-66
< SYMPTOM DIAGNOSIS >
THE FUEL GAUGE POINTER DOES NOT MOVE
SYMPTOM DIAGNOSIS
THE FUEL GAUGE POINTER DOES NOT MOVE
DescriptionINFOID:0000000001691325
Fuel gauge needle will not move from a certain position.
Diagnosis ProcedureINFOID:0000000001691326
1.CHECK COMBINATION METER INPUT SIGNAL
1. Select “METER/M&A” on CONSULT-III.
2. Using “FUEL METER” of “DATA MONITOR”, comp are the monitor value with the fuel gauge reading on
the combination meter. Refer to MWI-33, "
Component Function Check".
Does monitor value match fuel gauge reading?
YES >> GO TO 2
NO >> Replace combination meter. Refer to MWI-76, "
Removal and Installation".
2.CHECK FUEL LEVEL SENSOR SIGNAL CIRCUIT
Check the fuel level sensor signal circuit. Refer to MWI-33, "
DiagnosisProcedure".
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair harness or connector.
3.CHECK FUEL LEVEL SENSOR UNIT
Perform a unit check for the fuel level sensor unit. Refer to MWI-34, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 4
NO >> Replace fuel level sensor unit. Refer to FL-7, "
Removal and Installation".
4.CHECK FLOAT INTERFERENCE
Check that the float arm does not interfere or bi nd with any of the components in the fuel tank.
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-76, "Removal and Installation".
NO >> Repair or replace malfunctioning parts.
Revision: March 2010 2008 QX56

RSU-14
< REMOVAL AND INSTALLATION >
REAR SUSPENSION MEMBER
• When raising the rear suspension member assembly, use thelocating pins to align the rear suspension member to the vehicle
body.
• When installing the upper and lower rubber seats for the rear coil springs, the arrow embossed on the rubber seats must point out
toward the wheel and tire assembly.
• To connect the rear load leveling air suspension hoses, the lock ring must be fully seated in the fitt ing. Insert the hose “B” into the
lock ring “A” until the lock ring “A” is touching the hose “B” as
shown. Pull on the hose to check that it is securely inserted.
• Perform the final tightening of the nuts and bolts for the links (rubber bushing) under unladen condition (unladen condition means that the fuel tank, engine cool ant and lubricants are at the full specification, and
the spare tire, jack, hand tools, and mats are in t heir designated positions) with the tires on level ground.
• Check the wheel alignment. Refer to RSU-6, "
Wheel Alignment Inspection" .
LEIA0083E
LEIA0076E
LEIA0078E
Revision: March 2010 2008 QX56

SUSPENSION ARMRSU-17
< REMOVAL AND INSTALLATION >
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• Check the ball joint. Replace the suspension arm assembly if any of the following conditions exist:
- Ball stud is worn.
- Joint is hard to swing.
- Play in axial direction is excessive.
INSTALLATION
Installation is in the reverse order of removal.
• Tighten the nuts and bolts to specification. Refer to RSU-9, "
Component" .
• Perform the final tightening of the nuts and bolts for the links (rubber bushing) under unladen condition
(unladen condition means that the fuel tank, engine cool ant and lubricants are at the full specification, and
the spare tire, jack, hand tools, and mats are in t heir designated positions) with the tires on level ground.
• Check the wheel alignment. Refer to RSU-6, "
Wheel Alignment Inspection" .
Swinging force “A” : Refer to RSU-28, "
Ball Joint" .
Turning force “B” : Refer to RSU-28, "
Ball Joint" .
Vertical end play “C” : Refer to RSU-28, "
Ball Joint" .
SFA858A
Revision: March 2010 2008 QX56

FRONT LOWER LINKRSU-19
< REMOVAL AND INSTALLATION >
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• Check the ball joint. Replace the front lower link if any of the follow- ing conditions exist:
- Ball stud is worn.
- Joint is hard to swing.
- Play in axial direction is excessive.
INSTALLATION
Installation is in the reverse order of removal.
• Tighten the nuts and bolts to specification. Refer to RSU-9, "
Component" .
• Perform the final tightening of the nuts and bolts for the links (rubber bushing) under unladen condition
(unladen condition means that the fuel tank, engine cool ant and lubricants are at the full specification, and
the spare tire, jack, hand tools, and mats are in t heir designated positions) with the tires on level ground.
• Check the wheel alignment. Refer to RSU-6, "
Wheel Alignment Inspection"
Swinging force “A” : Refer to RSU-28, "Ball Joint" .
Turning force “B” : Refer to RSU-28, "
Ball Joint".
Vertical end play “C” : Refer to RSU-28, "
Ball Joint" .
SFA858A
Revision: March 2010 2008 QX56

PRECAUTIONSSCS-39
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000004900823
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 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 SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoper ative, 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 NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipm ent 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 Airbag Diagnosis Sensor Un it or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or el ectric 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 minutes before performing any service.
Precaution for Rear SuspensionINFOID:0000000001732010
• When installing the rubber bushings, the final tightening must be done under unladen condition and with thetires on level ground. Oil will shorten the life of the rubber bushings, so wipe off any spilled oil immediately.
• Unladen condition means the fuel tank, engine coolant and lubricants are at the full specification. The spare tire, jack, hand tools, and mats are in their designated positions.
• After installing suspension components, check the wheel alignment.
• Caulking nuts are not reusable. Always use new caulking nuts for installation. New caulking nuts are pre-
oiled, do not apply any additional lubrication.
Revision: March 2010 2008 QX56