2011 INFINITI QX56 check engine

DRIVE BELTSEM-21
< PERIODIC MAINTENANCE >
C
DE
F
G H
I
J
K L
M A
EM
NP
O
2. Install wrench (A) on drive belt auto tensioner pulley bolt, move
in the direction of arrow (loosening direction of tensioner) as
shown.
CAUTION:
 Never place hand in a location where pinching may occurif the holding tool accidentally comes off.
 Never loosen the hexagonal part in center of auto ten- sioner pulley (1) (Never turn it clockwise). If turned clock-
wise, the complete auto tensioner must be replaced as a
unit, including the pulley.
3. Under the above condition, insert a metallic bar (B) of approxi- mately 6 mm (0.24 in) in diameter (hexagonal bar wrench shown
as example in the figure) through the holding boss to lock auto tensioner pulley arm.
4. Remove drive belt.
INSTALLATION
Note the following item, and install in the reverse order of removal.
CAUTION:
 Check drive belts are securely installed around all pulleys.
 Check drive belts are correctly engaged with the pulley groove.
 Check for engine oil and engine coolant ar e not adhered drive belts and pulley groove.
InspectionINFOID:0000000006289528
INSPECTION AFTER INSTALLATION
 Turn crankshaft pulley clockwise several times to equalize tension between each pulley, and then confirm
tension of drive belts at indicator (notch on fixed side) is within the possible use range. Refer to EM-20,
"Exploded View".
JPBIA3484ZZ
Revision: 2010 May2011 QX56

EM-34
< REMOVAL AND INSTALLATION >
ROCKER COVER
 Loosen bolts in reverse order shown in the figure.
8. Remove rocker cover gasket from rocker cover.
9. Use scraper to remove all traces of liquid gasket from cylinder head & VVEL ladder assembly.
CAUTION:
Never scratch or damage the mating su rface when cleaning off old liquid gasket.
10. Remove PCV valve from rocker cover, if necessary.
11. Remove oil filler cap from rocker cover, if necessary.
INSTALLATION
1. Apply liquid gasket with the tube presser (commercial service tool) to VVEL ladder assembly (1).
Use Genuine RTV silicone seal ant or equivalent. Refer to
GI-22, "
Recommended Chemical Products and Sealants".
NOTE:
The figure shows an example of bank 1 side.
 Apply liquid gasket on the front and rear side of engine first. [5 mm (0.20 in) + 5 mm (0.20 in) side as shown in the figure]
2. Install rocker cover gasket to rocker cover.
3. Install rocker cover.  Check that rocker cover gasket does not drop fr om the installation groove of rocker cover.
A: Bank 2
B: Bank 1
: Engine front
JPBIA3481ZZ
A : Liquid gasket application point
F : End surface of VVEL ladder assembly
b : 4.0 mm (0.16 in)
c : 2.5 - 3.5 mm (0.098 - 0.138 in)
d : 5.0 mm (0.20 in)
e : 10.0 mm (0.39 in)
: Engine front
JPBIA3480ZZ
Revision: 2010 May2011 QX56

EM-42
< REMOVAL AND INSTALLATION >
EXHAUST MANIFOLD AND THREE WAY CATALYST
 Tighten mounting nuts in numerical order as shown in the figure.CAUTION:
All exhaust manifold nuts are tightened at twice.
Air Fuel Ratio Sensor 1, Heated Oxygen Sensor 2
CAUTION:
 Before installing new sensors, clean exhaust system threads usin g oxygen sensor thread cleaner
(commercial service tool: J-43897-18 or J-43897-12), and apply anti-seize lubricant (commercial ser-
vice tool).
 Sensors are not reusable. Replace them with a ne w one after removal. When replacing them, handle
with care not to impact on them.
 When installing the new air fu el ratio sensors 1 (1), set the
heated oxygen sensor wren ch [SST: KV10117100(J-44626)] (A)
in the hexagonal part to tighten the them.
 Never over torque sensors. Doing so may cause da mage to the sensors, resulting in “MIL” coming
on.
InspectionINFOID:0000000006289552
INSPECTION AFTER DISASSEMBLY
Surface Distortion
 Check the surface distortion of the exhaust manifold mating sur- face with a straightedge (A) and a feeler gauge (B).
 If it exceeds the limit, replace exhaust manifold.
A: Bank 1
B: Bank 2 : Engine front
JPBIA3475ZZ
JPBIA3492ZZ
Limit : Refer to EM-133, "ExhaustManifold".
JPBIA0018ZZ
Revision: 2010 May2011 QX56

HIGH PRESSURE FUEL PUMP AND FUEL HOSEEM-45
< REMOVAL AND INSTALLATION >
C
DE
F
G H
I
J
K L
M A
EM
NP
O
 To keep clean the connecting portion and to avoid dam-
age and foreign materials, cover them completely with
plastic bags, etc. or a similar item.
8. Disconnect harness connector from low fuel pressure sensor.
9. Remove fuel hose assembly.
10. Remove fuel pressure sensor. CAUTION:
 Never allow water and foreign mate rials enter into the connector.
 Never reuse the dropped sensor.
 Carefully handle sensor avoiding shocks.
 Use hex head support installation fo r removal and installation of sensor.
 The contact surface of gasket must not have any stain or scoring by dust etc.
INSTALLATION
1. Install O-ring to high pressure fuel pump. When handi ng new O-ring, paying attention to the following cau-
tion items:
CAUTION:
 Handle O-ring with bare hands. Never wear gloves.
 Lubricate O-ring with new engine oil.
 Never clean O-ring with solvent.
 Check that O-ring and its mating pa rt are free of foreign material.
 When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not to
twist or stretch O-ring. If O-ring was stretched wh ile it was being attached, never insert it quickly
into fuel tube.
 Insert new O-ring straight into fu el rail. Never decenter or twist it.
2. Install fuel pressure sensor.
3. Install fuel hose assembly.  Temporarily tighten mounting bolt (A) as shown in the figure.
4. Install high pressure fuel pump to front cover. CAUTION:
After removing lifter, replace lifter with a new one.
5. Connect fuel feed hose to high pressure fuel pump. NOTE:
 Never allow the machined edge of the high pr essure fuel pump to contact with gasket.
 The gasket contact area must be free of dust and scratches.
PBIC2205E
: Engine front
JPBIA4250ZZ
Revision: 2010 May2011 QX56

EM-46
< REMOVAL AND INSTALLATION >
HIGH PRESSURE FUEL PUMP AND FUEL HOSE
 Check that rotation stopper (A) of fuel feed hose contact highpressure fuel pump.
6. Tighten mounting bolts that are temporarily tightened in step 3.
7. Connect harness connector to high pressure fuel pump.
8. Install fuel pump connector protector.
9. Connect harness connector to low fuel pressure sensor.
10. Note the following, and connect quick connector to install fuel feed hose.
a. Check the connection for foreign material and damage.
b. Align center to insert quick connector straightly into fuel tube. NOTE:
The figure shows engine side as an example.
 Insert fuel tube into quick connector until the top spool on fueltube is inserted completely and the second level spool is posi-
tioned slightly below quick connector bottom end.
CAUTION:
 Hold “A” position in the figure when inserting fuel tube
into quick connector.
 Carefully align center to avoid inclined insertion to pre-
vent damage to O-ring inside quick connector.
 Insert until you hear a “c lick” sound and actually feel
the engagement.
 To avoid misidentification of engagement with a similar sound , be sure to perform the next
step.
c. Before clamping fuel feed hose with hose clamps, pull quick connector hard by hand holding “A” position.
Check it is completely engaged (connected) so that it does not come out from fuel feed tube.
d. Install quick connector cap to quick connector connection.  Install so that the arrow mark on the side faces up.
CAUTION:
 Check that quick connector and fuel tube are securely fitinto quick connector cap installation groove.
 If quick connector cap canno t be installed smoothly,
quick connector may have not been installed correctly.
Check connection again.
11. Install in the reverse order of removal.
InspectionINFOID:0000000006289555
INSPECTION AFTER INSTALLATION
Check for Fuel Leakage
1. Turn ignition switch “ON” (with the engine stopped). With fuel pressure applied to fuel piping, check that
there is no fuel leakage at connection points.
NOTE:
Use mirrors for checking at points out of clear sight.
2. Start the engine. With engine speed increased, check again that there is no fuel leakage at connection
points.
JSBIA0364ZZ
KBIA0272E
PBIC2348E
Revision: 2010 May2011 QX56

FUEL INJECTOR AND FUEL TUBEEM-51
< REMOVAL AND INSTALLATION >
C
DE
F
G H
I
J
K L
M A
EM
NP
O
a. Install an injector seal drift set [SST: KV101197S0 (—)] (A) to
fuel injector (1).
b. Set seal ring (1) to injector seal drift set [SST: KV101197S0 (—)]
(A).
c. Straightly insert seal ring (1), which is set in step 2, to fuel injec- tor as shown in the figure and install.
CAUTION:
Be careful that seal ring do es not exceed the groove portion
of fuel injector.
d. Insert injector seal drift set [SST: KV101197S0 (—)] (A) to injec- tor and rotate clockwise and counterclockwise by 90 ° while
pressing seal ring to fit it.
NOTE:
Compress seal ring, because this operation is for rectifying
stretch of seal ring caused by installation and for preventing
sticking when inserting injector into cylinder head.
2. Install O-ring and backup ring to fuel injector. When handing new O-ring and backup ring, paying attention to the following caution items:
CAUTION:
 Handle O-ring with bare hands. Never wear gloves.
 Lubricate O-ring with new engine oil.
 Never clean O-ring with solvent.
 Check that O-ring and its mating pa rt are free of foreign material.
 When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not to
twist or stretch O-ring. If O-ring was stretched wh ile it was being attached, never insert it quickly
into fuel tube.
 Insert new O-ring straight into fu el rail. Never decenter or twist it.
JSBIA0347ZZ
JSBIA0348ZZ
JSBIA0350ZZ
JSBIA0351ZZ
Revision: 2010 May2011 QX56

EM-52
< REMOVAL AND INSTALLATION >
FUEL INJECTOR AND FUEL TUBE
 Always install the back up ring (1) in the right direction as
instructed.
3. Install fuel injector (1) to fuel rail (2) as per the following:
a. Install fuel injector holder (5) to fuel injector. CAUTION:
 Never reuse injector holder. Replace it with a new one.
 Be careful to keep fuel inject or holder from interfering
with O-ring. If interfer ence occurs, replace O-ring.
b. Insert fuel injector into fuel rail with fuel injector holder attached.  Insert it while matching it to the axial center.
 Insert so that protrusion (A) of fuel injector is aligned to cutout
(B).
c. Check that installation is complete by checking that fuel injector does not rotate or come off.
 Check that protrusions of fuel in jectors and fuel rail are aligned
with cutouts of clips after installation.
4. Insert insulator into mounting hole of fuel injector of cylinder head.
5. Install fuel rail and fuel injector assembly to cylinder head.  Tighten mounting bolts and nuts in two steps in numericalorder as shown in the figure.
6. Connect injector harness connector.
7. Install fuel feed tube (bank side) to fuel rail. CAUTION:
 When inserting fuel feed tube (b ank side) to fuel rail, press the flange part to install the tube.
 Never use O-ring with any scoring.
 Never reuse fuel feed tube (ban k side), O-ring and back up ring.
JPBIA3864ZZ
3 : O-ring (blue)
4: Backup ring
JSBIA0352ZZ
: Engine front
1st step : 10.0 N·m (1.0 kg-m, 89 in-lb)
2nd step : 20.5 N·m (2.1 kg-m, 15 ft-lb)
JSBIA0353ZZ
Revision: 2010 May2011 QX56

FUEL INJECTOR AND FUEL TUBEEM-53
< REMOVAL AND INSTALLATION >
C
DE
F
G H
I
J
K L
M A
EM
NP
O
 Apply engine oil to O-ring.
 Tighten mounting bolts in numerical order as shown in the fig-
ure.
8. Install fuel feed tube (pump side) to fuel feed tube (bank side) as per the following:
CAUTION:
Never reuse fuel feed tube (pump side).
a. Apply engine oil to flare screw parts of high pr essure pump side and fuel feed tube (bank side) side.
b. Manually tighten 2 flare nuts without using a t ool until they are seated to screw thread.
c. Tighten mounting bolt (A).
d. Tighten flare nuts in numerical order as shown in the figure.
9. Install in the reverse order of removal.
InspectionINFOID:0000000006289558
INSPECTION AFTER INSTALLATION
Check for Fuel Leakage
1. Turn ignition switch “ON” (with the engine stopped). With fuel pressure applied to fuel piping, check that
there is no fuel leakage at connection points.
NOTE:
Use mirrors for checking at points out of clear sight.
2. Start the engine. With engine speed increased, check again that there is no fuel leakage at connection
points.
CAUTION:
Never touch the engine immediately after it is stopped because the engine is extremely hot.
JPBIA3924ZZ
: Engine front
JSBIA0355ZZ
B :To high pressure fuel pump
: Engine front
JSBIA0356ZZ
Revision: 2010 May2011 QX56