2004 INFINITI QX56 ECU

ENGINE ASSEMBLY
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Revision: August 20072004 QX56
5. Remove the cowl extension. Refer to EI-18, "Removal and Installation" .
6. Remove engine room cover using power tools.
7. Remove the air duct and air cleaner case assembly. Refer to EM-14, "
REMOVAL" .
8. Disconnect vacuum hose between vehicle and engine and set it aside.
9. Remove the radiator assembly and hoses. Refer to CO-10, "
REMOVAL" .
10. Remove the drive belts. Refer to EM-12, "
Removal" .
11. Remove the fan blade. Refer to CO-13, "
REMOVAL" .
12. Disconnect the engine room harness from the fuse box and set it aside for easier work.
13. Disconnect the ECM.
14. Disconnect the engine room harness from the engine side and set it aside for easier work.
15. Disconnect the engine harness grounds.
16. Disconnect the reservoir tank for power steering from engine and move it aside for easier work.
17. Disconnect power steering oil pump from engine. Move it from its location and secure with a rope for eas-
ier work. Refer to PS-26, "
REMOVAL" .
18. Remove the A/C compressor bolts and set aside. Refer to ATC-166, "
REMOVAL" .
19. Disconnect brake booster vacuum line.
20. Disconnect EVAP line.
21. Disconnect the fuel hose at the engine side connection. Refer to EM-29, "
REMOVAL" .
22. Disconnect the heater hoses at cowl, and install plugs to avoid leakage of engine coolant.
23. Remove the A/T oil level indicator and indicator tube upper bolts.
24. Remove the A/T. Refer to AT-255, "
Removal and Installation (4x2)" , or AT-258, "Removal and Installation
(4x4)" .
25. Install engine slingers into left bank cylinder head and right bank
cylinder head.
26. Lift with hoist and secure the engine in position.
27. Remove engine assembly from vehicle, avoiding interference
with vehicle body.
CAUTION:

Before and during this lifting, always check if any har-
nesses are left connected.
28. Remove alternator. Refer to SC-27, "
REMOVAL" .
29. Remove engine mounting insulator and bracket using power tool.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:

When replacing an engine or transmission you must make sure the dowels are installed correctly
during re-assembly.

Improper alignment caused by missing dowels may cause vibration, oil leaks or breakage of driv-
etrain components.
WBIA0464E
Engine slinger torque: 45.0 N·m (4.6 kg-m, 33 ft-lb)
PBIC1556E

FAX-10
DRIVE SHAFT
Revision: August 20072004 QX56
Steel Ball

Check for any compression scars, cracks, fractures, or unusual wear.
Inner Race

Check the ball sliding surface for any compression scars, cracks, or fractures.

Check for any damage to the serrated part.
CAUTION:
If any defective conditions are found, install a new housing, ball cage, steel ball, and inner race as
a set.
ASSEMBLY
Final Drive Side
1. Wrap the serrated part of the drive shaft with tape. Install the
boot band and boot to drive shaft.
NOTE:
Discard the old boot band and boot and use a new one for
assembly.
2. Remove the tape wound around the serrated part of the drive shaft.
3. Install the ball cage, steel ball, and inner race assembly on the
drive shaft, and secure them tightly using the snap ring.
NOTE:
Discard the old snap ring and use a new one for assembly.
4. Insert the specified quantity of Genuine NISSAN Grease or
equivalent, onto the housing (indicated by * marks), and install it
onto shaft. Refer to MA-10, "
RECOMMENDED FLUIDS AND
LUBRICANTS" .
5. Install the stopper ring onto the housing.
6. After installation, pull on the shaft to check engagement between the sliding joint and the stopper ring.
SFA80 0
SDIA11 25 E
Grease capacity : 130 − 150 g (4.58 − 5.29 oz)
RAC0678D

DRIVE SHAFT
FAX-11
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Revision: August 20072004 QX56
7. Install the boot securely into the grooves (indicated by * marks)
as shown.
CAUTION:
If there is grease on boot mounting surfaces (indicated by *
marks) of shaft and housing, boot may come off. Remove
all grease from surfaces.
8. Check that the boot installation length “L” is the length indicated
below. Insert a flat-tip screwdriver or similar tool into the big end
of the boot. Bleed air from the boot to prevent boot deformation.
CAUTION:

The boot may break if the boot installation length is less than the specified value.

Do not to touch the tip of the screwdriver to the inside of the boot.
9. Secure the big and small ends of the boot with the new boot
bands as shown.
NOTE:
Discard the old boot bands and use new ones for assembly.
10. After installing the sliding joint housing to the drive shaft, rotate the boot to check that the boot is posi-
tioned correctly. If the boot is not positioned correctly, reposition the boot and secure the boot using a new
boot band.
Wheel Side
1. Insert the Genuine NISSAN Grease or equivalent, into the joint
sub-assembly serration hole until the grease begins to ooze
from the ball groove and serration hole. Refer to MA-10, "
REC-
OMMENDED FLUIDS AND LUBRICANTS" . After inserting the
grease, use a shop cloth to wipe off the grease that has oozed
out.
2. Wrap the serrated part of the drive shaft with tape. Install the
boot band and boot onto the shaft. Do not damage the boot.
NOTE:
Discard the old boot band and boot and use a new one for
assembly.
3. Remove the protective tape wound around the serrated part of
the drive shaft.Boot installation length “L ” : 145 mm (5.71 in)
WDIA0287E
SFA39 5
SDIA11 27 E
SFA80 0

FAX-12
DRIVE SHAFT
Revision: August 20072004 QX56
4. Attach the circlip to the drive shaft. The circlip must fit securely
into the drive shaft groove. Attach the nut to the joint sub-assem-
bly.
Use a soft hammer to press-fit the circlip.
NOTE:
Discard the old circlip and use a new one for assembly.
5. Insert the specified quantity of Genuine NISSAN Grease or
equivalent, into the joint sub-assembly and the large end of the
boot. Refer to MA-10, "
RECOMMENDED FLUIDS AND LUBRI-
CANTS" .
6. Install the boot securely into the grooves (indicated by the *
marks) as shown.
CAUTION:
If there is grease on the boot mounting surfaces (indicated
by the * marks) of the drive shaft and joint sub-assembly,
the boot may come off. Remove all grease from the drive
shaft surfaces.
7. Check that the boot installation length “L” is the specified length.
Insert a flat-tip screwdriver or similar tool into the big end of the
boot. Bleed the air from the boot to prevent boot deformation.
CAUTION:

The boot may break if the boot installation length is less than the specified length.

Do not contact inside surface of boot with the tip of the screwdriver.
8. Secure the big and small ends of the boot using new boot bands
as shown.
NOTE:
Discard the old boot bands and use new ones for assembly.
9. After installing the joint sub-assembly to the drive shaft, rotate the boot to check that it is positioned cor-
rectly. If the boot is not positioned correctly, reposition the boot and secure the boot using a new boot
band.Grease capacity : 145 − 165 g (5.11 − 5.82 oz)
RAC0049D
Boot installation length “L” : 168.4 mm (6.63 in)WDIA0288E
SFA39 5

FUEL SYSTEM
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Revision: August 20072004 QX56
FUEL SYSTEMPFP:17503
Checking Fuel LinesEBS00IKN
Inspect fuel lines, fuel filler cap and fuel tank for improper attach-
ment, leaks, cracks, damage, loose connections, chafing or deterio-
ration.
If necessary, repair or replace damaged parts.
General PrecautionsEBS00IKO
WA RN ING:
When replacing fuel line parts, be sure to observe the following.

Put a “CAUTION: INFLAMMABLE” sign in the workshop.

Be sure to work in a well ventilated area and furnish workshop with a CO2 fire extinguisher.

Do not smoke while servicing fuel system. Keep open flames and sparks away from the work area.
CAUTION:

Before removing fuel line parts, carry out the following procedures:
–Put drained fuel in an explosion-proof container and put the lid on securely. Keep the container in
safe area.
–Release fuel pressure from the fuel lines. Refer to EC-46, "FUEL PRESSURE RELEASE" .
–Disconnect the battery negative terminal.

Always replace O-rings and clamps with new ones.

Do not kink or twist hoses when they are being installed.

Do not tighten hose clamps excessively to avoid damaging
hoses.
Tighten high-pressure rubber hose clamp so that clamp
end is 3 mm (0.12 in) from hose end.
Tightening torque specifications are the same for all rubber
hose clamps.
Check that the screw does not contact adjacent parts.
SM A80 3A
MMA104A

FL-4Revision: August 2007
FUEL SYSTEM
2004 QX56

After connecting the fuel tube quick connectors, make sure
the quick connectors are secure.
Ensure that the connector and resin tube do not contact
any adjacent parts.

After installing 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 con-
nections.
–Start the engine and rev it up and check for fuel leaks at
connections.

Use only a Genuine NISSAN fuel filler cap as a replacement.
If an incorrect fuel filler cap is used, the MIL may come on.

For servicing “Evaporative Emission System” parts, refer to
EC-633, "
EVAPORATIVE EMISSION SYSTEM" .

For servicing “On Board Refueling Vapor Recovery
(ORVR)” parts, refer to EC-640, "
ON BOARD REFUELING
VAPOR RECOVERY (ORVR)" .
PBIC1268E

FL-8Revision: August 2007
FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY
2004 QX56
11. Remove the lock ring using Tool.
12. Remove the fuel level sensor, fuel filter, and fuel pump assem-
bly.
CAUTION:

Do not bend the float arm during removal.

Avoid impacts such as dropping when handling the com-
ponents.
INSTALLATION
Installation is in the reverse order of removal.

Connect the quick connector as follows:
–Check the connection for any damage or foreign materials.
–Align the connector with the pipe, then insert the connector straight into the pipe until a click is heard.
–After connecting the quick connector, make sure that the con-
nection is secure by checking as follows:
–Pull the tube and the connector to make sure they are securely
connected.
–Visually inspect the connector to make sure the two retainer tabs
are securely connected.
INSPECTION AFTER INSTALLATION
1. Turn the ignition switch ON but do not start engine, then check the fuel pipes and hose connections for
leaks while applying fuel pressure to the system.
2. Start the engine and rev it above idle speed, then check that there are no fuel leaks at any of the fuel pipe
and hose connections.Tool number : — (J-46536)
LBIA0389E
PBIC1653E

FUEL TANK
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Revision: August 20072004 QX56
19. Remove the fuel tank strap bolts while supporting the fuel tank
with a suitable lift jack.
20. Disconnect the EVAP hose from the molded clip in the top of the fuel tank while lowering the fuel tank.
21. Lower the fuel tank using a suitable lift jack and remove it.
22. If necessary, remove the lock ring using Tool.
23. If necessary, remove the fuel level sensor, fuel filter, and fuel
pump assembly.
CAUTION:

Do not bend the float arm during removal.

Avoid impacts such as dropping when handling the com-
ponents.
INSTALLATION
Installation is in the reverse order of removal.

Connect the quick connector as follows:
–Check the connection for any damage or foreign materials.
–Align the connector with the pipe, then insert the connector straight into the pipe until a click is heard.
–After connecting the quick connector, make sure that the con-
nection is secure by checking as follows:
–Pull the tube and the connector to make sure they are securely
connected.
–Visually inspect the connector to make sure the two retainer tabs
are securely connected.
INSPECTION AFTER INSTALLATION
1. Turn the ignition switch ON but do not start engine, then check the fuel pipe and hose connections for
leaks while applying fuel pressure.
2. Start the engine and rev it above idle, then check that there are no fuel leaks at any of the fuel pipe and
hose connections.
LBIA0387E
Tool number : — (J-46536)
LBIA0389E
PBIC1653E