length INFINITI QX56 2006 Factory User Guide

ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-65
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The DTC and 1st trip DTC are displayed at the same time. If the MIL does not illuminate in diagnostic test
mode I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the MIL
illuminates in diagnostic test mode II (SELF-DIAGNOSTIC RESULTS), it is a DTC; if two or more codes are
displayed, they may be either DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These uniden-
tified codes can be identified by using the CONSULT-II or GST. A DTC will be used as an example for how to
read a code.
A particular trouble code can be identified by the number of four-digit numeral flashes. The “zero” is indicated
by the number of ten flashes. The “A” is indicated by the number of eleven flash.The length of time the
1,000th-digit numeral flashes on and off is 1.2 seconds consisting of an ON (0.6-second) - OFF (0.6-second)
cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle.
A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later
numeral appears on the display 1.3 seconds after the former numeral has disappeared.
A change from one trouble code to another occurs at an interval of 1.8-second OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no mal-
function. (See EC-8, "
INDEX FOR DTC" )
How to Erase Diagnostic Test Mode II (Self-diagnostic Results)
The DTC can be erased from the back up memory in the ECM by depressing accelerator pedal. Refer to EC-
64, "How to Erase Diagnostic Test Mode II (Self-diagnostic Results)" .

If the battery is disconnected, the DTC will be lost from the backup memory within 24 hours.

Be careful not to erase the stored memory before starting trouble diagnoses.
OBD System Operation ChartUBS00KZT
RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS

When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are
stored in the ECM memory.
PBIB3005E

EC-598Revision: November 2009
FUEL INJECTOR
2006 QX56
FUEL INJECTORPFP:16600
Component DescriptionUBS00L1F
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector circuit, the coil in the fuel injec-
tor is energized. The energized coil pulls the ball valve back and
allows fuel to flow through the fuel injector into the intake manifold.
The amount of fuel injected depends upon the injection pulse dura-
tion. Pulse duration is the length of time the fuel injector remains
open. The ECM controls the injection pulse duration based on
engine fuel needs.
CONSULT-II Reference Value in Data Monitor ModeUBS00L1G
Specification data are reference values.
SEF375Z
MONITOR ITEMCONDITION SPECIFICATION
B/FUEL SCHDL See EC-134, "
TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .
INJ PULSE-B1
INJ PULSE-B2

Engine: After warming up

Air conditioner switch: OFF

Selector lever: P or N

No load Idle
2.0 - 2.8 msec
2,000 rpm 1.9 - 2.9 msec

EM-36Revision: November 2009
ROCKER COVER
2006 QX56
INSTALLATION
1. Apply liquid gasket to the joint part of the cylinder head andcamshaft bracket following the steps below.
NOTE:
Illustration shows an example of (LH) side (zoomed in shows
No.1 camshaft bracket).
a. Refer to illustration ″a ″ to apply liquid gasket to the joint part of
No.1 camshaft bracket and cylinder head.
b. Refer to illustration ″b ″ to apply liquid gasket 90 ° to illustration
″ a ″.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-46, "
Recommended Chemical Products and Sealants" .
2. Install the rocker cover (A) or (B).

Make sure the new rocker cover gasket is installed in the groove of the rocker cover (A) or (B).

Tighten the bolts in two steps in the numerical order shown.
CAUTION:
Do not hold the rocker cover (RH) (B) by the oil filler
neck.
3. Install the PCV hoses. NOTE:

Remove foreign materials from inside the hose using com-
pressed air.

The inserted length is within 25 - 30 mm (0.98 - 1.18 in) [Target: 25 mm (0.98 in)].
4. Installation of the remaining components is in the reverse order of removal.
KBIA2510E
1st step : 2.0 N·m (0.2 kg-m, 18 in-lb)
2nd step : 8.3 N·m (0.85 kg-m, 73 in-lb)
WBIA0697E

EM-96Revision: November 2009
CYLINDER BLOCK
2006 QX56

If out of specification, replace piston ring. If the gap still exceeds the limit even with a new ring, re-bore the
cylinder and use oversized piston and piston ring.
CONNECTING ROD BEND AND TORSION

Check connecting rod alignment using suitable tool.

If measurement exceeds the limit, replace connecting rod
assembly.
CONNECTING ROD BEARING (BIG END)

Install the connecting rod cap without the connecting rod bearing
installed. After tightening the connecting rod bolt to the specified
torque, measure the connecting rod large end inside diameter.
Refer to EM-82, "
ASSEMBLY" .

If measurement exceeds the standard, replace connecting rod.
CONNECTING ROD BUSHING OIL CLEARANCE (SMALL END)
Connecting Rod Inside Diameter (Small End)

Measure inside diameter of bushing using suitable tool.Limit:
Bend: 0.15 mm (0.0059 in) per 100 mm (3.94 in) length
To r s i o n : 0.30 mm (0.0118 in) per 100 mm (3.94 in) length
SEM003F
SEM038F
Standard : 57.000 - 57.013 mm (2.2441 - 2.2446 in)
PBIC1641E
Standard : 22.000 - 22.006 mm (0.8661 - 0.8664 in)
PBIC0120E

SERVICE DATA AND SPECIFICATIONS (SDS)EM-107
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CYLINDER HEAD
Unit: mm (in)
Valve Dimensions
Unit: mm (in)
Items
StandardLimit
Head surface distortion 0.03 (0.0012)0.1 (0.004)
Nominal cylinder head height “H ” 126.3 (4.97)
KBIA2554E
Valve head diameter “D” Intake
37.0 - 37.3 (1.457 - 1.469)
Exhaust 31.2 - 31.5 (1.228 - 1.240)
Valve length “ L” Intake
96.21- 96.71 (3.7878 - 3.8075)
Exhaust 93.74 - 94.24 (3.6905 - 3.7102)
Valve stem diameter “ d” Intake
5.965 - 5.980 (0.2348 - 0.2354)
Exhaust 5.955 - 5.970 (0.2344 - 0.2350)
Valve seat angle “α ” Intake
45°15 ′ - 45 °45 ′
Exhaust
Valve margin “T ” Intake
1.1 (0.043)
Exhaust 1.3 (0.051)
SEM188

EM-108Revision: November 2009
SERVICE DATA AND SPECIFICATIONS (SDS)
2006 QX56
Valve Guide
Unit: mm (in)
Valve Seat
Unit: mm (in)
Valve Spring
ItemsStandardOversize [0.2 (0.008)] (service)
Valve guide Outside diameter
10.023 - 10.034 (0.3946 - 0.3950) 10.223 - 10.234 (0.4025 - 0.4029)
Inside diameter (Finished size) 6.000 - 6.018 (0.2362 - 0.2369) —
Cylinder head valve guide hole diameter 9.975 - 9.996 (0.3927 - 0.3935) 10.175 - 10.196 (0.4006 - 0.4014)
Interference fit of valve guide 0.027 - 0.059 (0.0011 - 0.0023)
Items StandardLimit
Stem to guide clearance Intake
0.020 - 0.053 (0.0008 - 0.0021) 0.08 (0.0031)
Exhaust 0.030 - 0.063 (0.0012 - 0.0025) 0.09 (0.0035)
Projection length “L ” Intake
12.6 - 12.8 (0.496 - 0.504)
Exhaust 12.5 - 12.9 (0.492 - 0.508)
KBIA2555E
Items StandardOversize [0.5 (0.020)] (Service)
Cylinder head seat recess diameter ″D ″ Intake 38.000 - 38.016 (1.4961 - 1.4967) 38.500 - 38.516 (1.5157 - 1.5164)
Exhaust 32.200 - 32.216 (1.2677 - 1.2683) 32.700 - 32.716 (1.2874 - 1.2880)
Valve seat interference fit Intake
0.081 - 0.113 (0.0032 - 0.0044)
Exhaust 0.064 - 0.096 (0.0025 - 0.0038)
Valve seat diameter ″d ″ Intake 38.097 - 38.113 (1.4999 - 1.5005) 38.597 - 38.613 (1.5196 - 1.5202)
Exhaust 32.280 - 32.296 (1.2709 - 1.2715) 32.780 - 32.796 (1.2905 - 1.2912)
KBIA2541E
Free height mm (in)
50.58 (1.9913)
Pressure N (kg, lb) at height mm (in) Installation
165.8 - 187.0 (16.9 - 19.1, 37 - 42) at 37.0 (1.457)
Valve open 314.8 - 355.0 (32.1 - 36.2, 71 - 80) at 28.2 (1.110)
Out-of-square mm (in) Less than 2.2 (0.087)

DRIVE SHAFTFAX-11
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Revision: November 2009 2006 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 suitable tool into the large end of the boot, as
shown. 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 contact inside surface of boot with tip of the suitable tool.
9. Secure the large 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 jointsub-assembly serration hole until the grease begins to ooze
from the ball groove and serration hole. Refer to MA-11, "
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
SFA395
SDIA1127E
SFA800

FAX-12
DRIVE SHAFT
Revision: November 20092006 QX56
4. Attach the circlip to the drive shaft making sure circlip fits
securely into groove on drive shaft. Then install drive shaft nut to
end of joint sub-assembly, and press-fit the circlip using a suit-
able tool as shown.
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-11, "
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 suitable tool into the large end of the boot, as shown.
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 suitable tool.
8. Secure large and small ends of the boot using new boot bands using tool as shown.
NOTE:
Discard the old boot bands and use new ones for assembly.

Secure boot band so that dimension "M" meets specification
as shown.
9. After installing the housing to the shaft, rotate the boot to check that it is positioned correctly. If the boot is not positioned correctly, remove the old boot bands then reposition the boot and secure the boot with new
boot bands. Grease capacity : 145
− 165 g (5.11 − 5.82 oz)
RAC0049D
Boot installation length “L” : 168.4 mm (6.63 in)
Tool number : KV40107300 ( — )WDIA0288E
RAC1133D
Dimension "M" : 1.0 – 4.0 mm (0.039 – 0.157 in)
DSF0047D

SERVICE DATA AND SPECIFICATIONS (SDS)FAX-13
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Revision: November 2009 2006 QX56
SERVICE DATA AND SPECIFICATIONS (SDS)PFP:00030
Wheel BearingEDS003BR
Drive ShaftEDS003BS
Boot BandsEDS004G1
Unit: mm (in)
Wheel bearing axial end play
0.05 mm (0.002 in) or less
Drive shaft joint typeFinal drive side Rzeppa
Wheel side Rzeppa
Grease Quality
Nissan Genuine Grease or
equivalent
Capacity Final drive side
130 - 150 g (4.58 - 5.29 oz)
Wheel side 145 - 165 g (5.11 - 5.82 oz)
Boot length Final drive side "L "
145 mm (5.71 in)
Wheel side "L " 168.4 mm (6.63 in)
WDIA0055E
Dimension "M" 1.0 - 4.0 (0.039 - 0.157)
DSF0047D

FSU-8
ON-VEHICLE SERVICE
Revision: November 20092006 QX56
1. Bounce the front of vehicle up and down to stabilize the vehicle height (posture).
2. Push the vehicle straight ahead about 5 m (16 ft).
3. Put a mark on base line of the tread (rear side) of both front tires
at the same height as hub center as shown. These marks are
measuring points.
4. Measure the distance “A” on the rear side of the front tires as shown.
5. Push the vehicle slowly ahead to rotate the wheels 180 °
degrees (1/2 a turn).
CAUTION:
If the wheels have rotated more than 180 ° degrees (1/2
turn), start this procedure again from the beginning. Never
push the vehicle backward.
6. Measure the distance “B” on the front side of the front tires at the same marks as shown. Total toe-in is calculated as “A” – “B”.
7. Adjust the toe-in by varying the length of the steering outer socket.
a. Loosen the outer tie-rod lock nuts.
b. Adjust the toe-in by screwing the outer tie-rods in or out.
c. Tighten the outer tie-rod lock nuts to specification.
FRONT WHEEL TURNING ANGLE
NOTE:
Check front wheel turning angle after the toe-in inspection.
1. Place front wheels on turning radius gauges in straight ahead position and rear wheels on stands so that vehicle can be level.
Check the maximum inner and outer wheel turning angles for LH
and RH road wheels.
2. Start engine and run at idle, turn steering wheel all the way right and left, measure the turning angle.

Any turning angles are not adjustable. If any of steering
angles are out of the specification, check if the following parts
are worn or damaged.
–Steering gear
–Steering column
–Front suspension components
AFA050
Total toe-in : Refer to FSU-19, "Wheel Alignment
(Unladen*1 )*6" .
SFA234AC
Standard length “L” : Refer to PS-26, "Steering Outer
Socket and Inner Socket" .
Lock nut : Refer to PS-15, "
Removal and
Installation" .SGIA0167E
Wheel turning angle
(full turn) : Refer to
FSU-19, "Wheel
Alignment (Unladen*1 )*6" .
SFA439BA