2005 INFINITI QX4 ESP

EM-92Revision: October 2005
CYLINDER BLOCK
2005 QX56
Piston Pin Diameter

Measure diameter of piston pin using suitable tool.
Connecting Rod Bushing Oil Clearance (Small End)
(Connecting rod small end oil clearance) = (Inside diameter of con-
necting rod small end) – (Piston pin diameter)

If measured value exceeds the standard, replace the connecting
rod assembly and/or piston and piston pin assembly.

If replacing the piston and piston pin assembly, refer to the Table
for Selective Fitting for Piston to select the piston corresponding
to the applicable bore grade of the cylinder block to be used.
Refer to EM-83, "
HOW TO SELECT PISTON" .
Factory installed parts grading:

Only grade 0 is available.
Unit: mm (in)
CYLINDER BLOCK DISTORTION

Remove any oil, scale, gasket, sealant and carbon deposits from the cylinder block surface.
CAUTION:
Do not allow any debris to enter the oil or coolant passages.

Measure block upper face for distortion in six directions as
shown.

If measurement exceeds the limit, replace cylinder block.Standard : 21.989 - 21.995 mm (0.8657 - 0.8659 in)
PBIC0 117 E
Standard : 0.005 - 0.017 mm (0.0002 - 0.0007 in)
KBIA2536E
Grade 0
Connecting rod bushing inside diameter22.000 - 22.006
(0.8661 - 0.8664)
Piston pin diameter21.989 - 21.995
(0.8657 - 0.8659)
Piston pin hole diameter21.993 - 21.999
(0.8659 - 0.8661)
KBIA2496E
Standard : 0.03 mm (0.0012 in)
Limit : 0.1 mm (0.004 in)
SEM 12 3C

FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY
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Revision: October 20052005 QX56
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.
CAUTION:

The quick connector can be disconnected when the tabs
are completely depressed. Do not twist the quick connec-
tor more than necessary.

Do not use any tools to disconnect the quick connector.

Keep the resin tube away from heat. Be especially careful
when welding near the tube.

Prevent any acid liquids such as battery electrolyte, from
getting on the resin tube.

Do not bend or twist the resin tube during connection.

Do not remove the remaining retainer on the hard tube (or
the equivalent) except when the resin tube or the retainer
is replaced.

When the resin tube or hard tube, or the equivalent, is
replaced, also replace the retainer with a new one (white
colored retainer).

To keep the quick connector clean and to avoid damage
and contamination from foreign materials, cover the
quick connector with plastic bags or suitable material as
shown.
SF E5 62 A
PBIC1268E
PBIC0163E

FL-12Revision: October 2005
FUEL TANK
2005 QX56
CAUTION:

The quick connector can be disconnected when the tabs
are completely depressed. Do not twist the quick connec-
tor more than necessary.

Do not use any tools to disconnect the quick connector.

Keep the resin tube away from heat. Be especially careful
when welding near the tube.

Prevent any acid liquids such as battery electrolyte, from
getting on the resin tube.

Do not bend or twist the resin tube during connection.

Do not remove the remaining retainer on the hard tube (or
the equivalent) except when the resin tube or the retainer
is replaced.

When the resin tube or hard tube, or the equivalent, is
replaced, also replace the retainer with a new one (white
colored retainer).

To keep the quick connector clean and to avoid damage
and contamination from foreign materials, cover the
quick connector with plastic bags or suitable material as
shown.
15. Remove the four bolts and remove the fuel tank shield.
16. Remove the propeller shaft. Refer to PR-8, "
REAR PROPELLER SHAFT" .
17. Remove the three clips and remove the fuel tank protector at the
front of the fuel tank as necessary to transfer to the new fuel
tank.
18. Disconnect fuel filler hose, and vent hose at the fuel tank side.
PBIC1268E
PBIC0163E
LBIA0388E

GI-4
PRECAUTIONS
Revision: October 20052005 QX56
General PrecautionsEAS001F7

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
SEF 2 89 H
SGI233

HOW TO USE THIS MANUAL
GI-15
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Revision: October 20052005 QX56
How to Read Wiring DiagramsEAS001FK
CONNECTOR SYMBOLS
Most of connector symbols in wiring diagrams are shown from the
terminal side.

Connector symbols shown from the terminal side are enclosed
by a single line and followed by the direction mark.

Connector symbols shown from the harness side are enclosed
by a double line and followed by the direction mark.

Certain systems and components, especially related to OBD,
may use a new style slide-locking type harness connector. For
description and how to disconnect, refer to PG-67, "
HARNESS
CONNECTOR" .

Male and female terminals
Connector guides for male terminals are shown in black and
female terminals in white in wiring diagrams.
SGI364
SGI363

GI-18
HOW TO USE THIS MANUAL
Revision: October 20052005 QX56
14 Wire color

This shows a code for the color of the wire.
B = Black
W = White
R = Red
G = Green
L = Blue
Y = Yellow
LG = Light GreenBR = Brown
OR or O = Orange
P = Pink
PU or V (Violet) = Purple
GY or GR = Gray
SB = Sky Blue
CH = Dark Brown
DG = Dark Green
When the wire color is striped, the base color is given first, followed by the stripe color as shown
below:
Example: L/W = Blue with White Stripe
15 Option description

This shows a description of the option abbreviation used on the page.
16 Switch

This shows that continuity exists between terminals 1 and 2 when the switch is in the A posi-
tion. Continuity exists between terminals 1 and 3 when the switch is in the B position.
17 Assembly parts

Connector terminal in component shows that it is a harness incorporated assembly.
18 Cell code

This identifies each page of the wiring diagram by section, system and wiring diagram page
number.
19 Current flow arrow

Arrow indicates electric current flow, especially where the direction of standard flow (vertically
downward or horizontally from left to right) is difficult to follow.

A double arrow “ ” shows that current can flow in either direction depending on cir-
cuit operation.
20 System branch

This shows that the system branches to another system identified by cell code (section and
system).
21 Page crossing

This arrow shows that the circuit continues to another page identified by cell code.

The C will match with the C on another page within the system other than the next or preced-
ing pages.
22 Shielded line

The line enclosed by broken line circle shows shield wire.
23Component box in
wave line

This shows that another part of the component is also shown on another page (indicated by
wave line) within the system.
24 Component name

This shows the name of a component.
25 Connector number

This shows the connector number.

The letter shows which harness the connector is located in.

Example: M : main harness. For detail and to locate the connector, refer to PG section "Main
Harness", “Harness Layout”. A coordinate grid is included for complex harnesses to aid in
locating connectors.
26 Ground (GND)

The line spliced and grounded under wire color shows that ground line is spliced at the
grounded connector.
27 Ground (GND)

This shows the ground connection. For detailed ground distribution information, refer to
"Ground Distribution" in PG section.
28 Connector views

This area shows the connector faces of the components in the wiring diagram on the page.
29 Common component

Connectors enclosed in broken line show that these connectors belong to the same compo-
nent.
30 Connector color

This shows a code for the color of the connector. For code meaning, refer to wire color codes,
Number 14 of this chart.
31Fusible link and fuse
box

This shows the arrangement of fusible link(s) and fuse(s), used for connector views of
"POWER SUPPLY ROUTING" in PG section.
The open square shows current flow in, and the shaded square shows current flow out.
32 Reference area

This shows that more information on the Super Multiple Junction (SMJ) and Joint Connectors
(J/C) exists on the PG section. Refer to "Reference Area" for details. Num-
berItem Description

SQUEAK AND RATTLE TROUBLE DIAGNOSES
GW-5
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Revision: October 20052005 QX56
SQUEAK AND RATTLE TROUBLE DIAGNOSESPFP:00000
Work FlowEIS0 04 T N
CUSTOMER INTERVIEW
Interview the customer if possible, to determine the conditions that exist when the noise occurs. Use the Diag-
nostic Worksheet during the interview to document the facts and conditions when the noise occurs and any
customer's comments; refer to GW-9, "
Diagnostic Worksheet" . This information is necessary to duplicate the
conditions that exist when the noise occurs.

The customer may not be able to provide a detailed description or the location of the noise. Attempt to
obtain all the facts and conditions that exist when the noise occurs (or does not occur).

If there is more than one noise in the vehicle, be sure to diagnose and repair the noise that the customer
is concerned about. This can be accomplished by test driving the vehicle with the customer.

After identifying the type of noise, isolate the noise in terms of its characteristics. The noise characteristics
are provided so the customer, service adviser and technician are all speaking the same language when
defining the noise.

Squeak —(Like tennis shoes on a clean floor)
Squeak characteristics include the light contact/fast movement/brought on by road conditions/hard sur-
faces = higher pitch noise/softer surfaces = lower pitch noises/edge to surface = chirping.

Creak—(Like walking on an old wooden floor)
Creak characteristics include firm contact/slow movement/twisting with a rotational movement/pitch
dependent on materials/often brought on by activity.

Rattle—(Like shaking a baby rattle)
Rattle characteristics include the fast repeated contact/vibration or similar movement/loose parts/missing
clip or fastener/incorrect clearance.

Knock —(Like a knock on a door)
Knock characteristics include hollow sounding/sometimes repeating/often brought on by driver action.

Tick—(Like a clock second hand)
Tick characteristics include gentle contacting of light materials/loose components/can be caused by driver
action or road conditions.

Thump—(Heavy, muffled knock noise)
Thump characteristics include softer knock/dead sound often brought on by activity.

Buzz—(Like a bumble bee)
Buzz characteristics include high frequency rattle/firm contact.

Often the degree of acceptable noise level will vary depending upon the person. A noise that you may
judge as acceptable may be very irritating to the customer.

Weather conditions, especially humidity and temperature, may have a great effect on noise level.
SBT 8 42

IP-4
SQUEAK AND RATTLE TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
SQUEAK AND RATTLE TROUBLE DIAGNOSISPFP:00000
Work FlowEIS004WZ
CUSTOMER INTERVIEW
Interview the customer, if possible, to determine the conditions that exist when the noise occurs. Use the Diag-
nostic Worksheet during the interview to document the facts and conditions when the noise occurs and any
customer's comments; refer to IP-8, "
Diagnostic Worksheet" . This information is necessary to duplicate the
conditions that exist when the noise occurs.

The customer may not be able to provide a detailed description or the location of the noise. Attempt to
obtain all the facts and conditions that exist when the noise occurs (or does not occur).

If there is more than one noise in the vehicle, be sure to diagnose and repair the noise that the customer
is concerned about. This can be accomplished by test driving the vehicle with the customer.

After identifying the type of noise, isolate the noise in terms of its characteristics. The noise characteristics
are provided so the customer, service adviser and technician are all speaking the same language when
defining the noise.
–Squeak — (Like tennis shoes on a clean floor)
Squeak characteristics include the light contact/fast movement/brought on by road conditions/hard sur-
faces = higher pitch noise/softer surfaces = lower pitch noises/edge to surface = chirping.
–Creak — (Like walking on an old wooden floor)
Creak characteristics include firm contact/slow movement/twisting with a rotational movement/pitch
dependent on materials/often brought on by activity.
–Rattle — (Like shaking a baby rattle)
Rattle characteristics include the fast repeated contact/vibration or similar movement/loose parts/missing
clip or fastener/incorrect clearance.
–Knock — (Like a knock on a door)
Knock characteristics include hollow sounding/sometimes repeating/often brought on by driver action.
–Tick — (Like a clock second hand)
Tick characteristics include gentle contacting of light materials/loose components/can be caused by driver
action or road conditions.
–Thump — (Heavy, muffled knock noise)
Thump characteristics include softer knock/dead sound often brought on by activity.
–Buzz — (Like a bumblebee)
Buzz characteristics include high frequency rattle/firm contact.

Often the degree of acceptable noise level will vary depending upon the person. A noise that you may
judge as acceptable may be very irritating to the customer.

Weather conditions, especially humidity and temperature, may have a great effect on noise level.
SBT 8 42