check engine INFINITI QX56 2007 Factory Service Manual

INTAKE MANIFOLDEM-17
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INTAKE MANIFOLD
Removal and InstallationINFOID:0000000003531526
REMOVAL
1. Partially drain the engine coolant. Refer to
CO-9, "Changing Engine Coolant".
WARNING:
To avoid the danger of being scalded, never drai n the engine coolant when the engine is hot.
2. Remove the engine room cover using power tool. Refer to EM-12, "
Removal and Installation".
3. Release the fuel pressure. Refer to EC-80, "
Fuel Pressure Check".
4. Remove the air duct and resonator assembly. Refer to EM-15, "
Removal and Installation".
5. Disconnect the fuel tube qui ck connector on the engine side.
1. Intake manifold 2. PCV hose 3. Gasket
4. Electric throttle control actuator 5. Water hose 6. Water hose
7. PCV hose 8. EVAP hose 9. EVAP canister purge control solenoid
valve
10. Bracket 11. Gasket
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LBIA0395E

INTAKE MANIFOLDEM-19
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• Tighten the intake manifold bolts in numerical order as shown.
• Install the EVAP canister purge control solenoi
d valve connector with it facing front of engine.
• Tighten the electronic throttle control actuator bolts of the electric throttle control actuator equally and diago-
nally in several steps.
• After installation perform inspection after installation.
• Install the water hose so that its overlap width for connection is between 27 mm (1.06 in) and 32 mm (1.26
in) (target: 27 mm 1.06 in).
Connecting Quick Connector of Fuel Tube
Install quick connector as follows (the steps are the same for quick connectors on both engine side and vehi-
cle side except for the quick connector cap).
1. Make sure no foreign substances are deposited in and around tube and quick connector, and they are not
damaged.
2. Thinly apply new engine oil around the fuel tube from tip end to the spool end.
3. Align center to insert quick connector straight into fuel tube. • Insert until the paint mark for engagement identification (white)
goes completely inside quick connector so that you cannot see
it from the straight side of the connected part. Use a mirror to
check this where it is not possible to view directly from the
straight side, such as quick connector on vehicle side.
• Insert fuel tube into quick connector until top spool is com- pletely inside quick connector, and 2nd level spool exposes
right below quick connector on engine side.
CAUTION:
• Hold "A" position in illustration when inserting fuel tubeinto quick connector.
• Carefully align center to avoid inclined insertion to pre-
vent damage to O-ring inside quick connector.
• Insert until you hear a "click" sound and actually feel the engagement.
• To avoid misidentification of engagement with a similar
sound, be sure to perform the next step.
4. Pull quick connector by hand holding "A" position. Make sure it is completely engaged (connected) so that it does not come out from fuel tube.
NOTE:
Recommended pulling force is 50 N (5.1 kg, 11.2 lb).
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PBIC0017E
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EM-20
< SERVICE INFORMATION >
INTAKE MANIFOLD
5. Install the quick connector cap on the quick connector joint (onengine side only).
6. Install the fuel hose and tube to hose clamps.
7. Refill the engine coolant. Refer to CO-9, "
Changing Engine
Coolant".
INSPECTION AFTER INSTALLATION
• After installing fuel tubes, make sure there is no fuel leakage at connections in the following steps.
- Apply fuel pressure to fuel lines by turning i gnition switch ON (with engine stopped). Then check for fuel
leaks at connections.
- Start the engine and rev it up and check for fuel leaks at the connections.
• Perform procedures for throttle valve closed position learning after finishing repairs. Refer to EC-77, "
Throt-
tle Valve Closed Position Learning".
• If electric throttle control actuator is replaced, perform procedures for idle air volume learning” after finishing
repairs. Refer to EC-78, "
Idle Air Volume Learning".
SBIA0354E

OIL PAN AND OIL STRAINEREM-27
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4. Install the oil pan drain plug.
5. Install engine assembly. Refer to
EM-74, "
Removal and Installation".
• Do not fill the engine oil for at least 30 minutes after oil pan is installed.
INSPECTION AFTER INSTALLATION
1. Check engine oil level and add engine oil if necessary. Refer to LU-8, "Inspection".
2. Start the engine, and check for leaks of engine oil.
3. Stop engine and wait for 10 minutes.
4. Check engine oil level again.

FUEL INJECTOR AND FUEL TUBEEM-31
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FUEL INJECTOR AND FUEL TUBE
Removal and InstallationINFOID:0000000003531531
CAUTION:
Do not remove or disassemble parts unless instructed as shown.
REMOVAL
1. Remove the engine room cover using power tool. Refer to
EM-12, "Removal and Installation".
2. Release the fuel pressure. Refer to EC-80, "
Fuel Pressure Check".
3. Disconnect the negative battery terminal.
4. Disconnect the fuel injector harness connectors.
5. Disconnect the fuel hose assembly from the fuel tubes (RH and LH).
CAUTION:
• While hoses are disconnected, plug th em to prevent fuel from draining.
• Do not separate the fuel connector and fuel hose.
6. Remove the fuel injectors with the fuel tube assembly.
1. Fuel tube (RH) 2. Cap 3. Fuel damper
4. O-ring 5. O-ring (b lue) 6. Fuel injector
7. Clip 8. O-ring (brown) 9. O-ring
10. Fuel hose assembly 11. Fuel tube (LH)
KBIA2472E

FUEL INJECTOR AND FUEL TUBEEM-33
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• Lubricate new O-ring with new engine oil.
• Do not clean O-ring with solvent.
• Make sure that O-ring and its mating
part 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 while it was being att ached, do not insert it quickly into fuel tube.
• Insert O-ring straight into fuel tube. Do not angle or twist it.
3. Install the fuel injector to the fuel tube using the following steps.
a. Insert new clip into clip mounting groove on the fuel injector. • Insert clip so that lug ″A ″ of fuel injector matches notch ″A ″ of
the clip.
CAUTION:
• Do not reuse clip. Replace it with a new one.
• Do not allow the clip to interf ere with the O-ring. If inter-
ference occurs, replace the O-ring.
b. Insert the fuel injector into the fuel tube with the clip attached. • Insert it while matching it to the axial center.
• Insert fuel injector so that lug ″B ″ of fuel tube matches notch
″ B ″ of the clip.
• Make sure that the fuel tube flange is securely seated in the flange fixing groove on the clip.
c. Make sure that installation is complete by checking that the fuel injector does not rotate or come off.
• Make sure that the protrusions of the fuel injectors are alignedwith the cutouts of the clips after installation.
4. Install the fuel tube and fuel injector assembly to the intake manifold. CAUTION:
Do not let the tip of the injector nozz le come in contact with other parts.
• Tighten fuel tube assembly bolts ″a ″ to ″b ″ in illustration in two
steps.
5. Install the fuel hose assembly. • Insert connectors straight, making su re that the axis is lined up with fuel tube side to prevent O-ring from
being damaged.
• Tighten bolts evenly in several steps.
• Make sure that there is no gap between the flange and fuel tube after tightening the bolts.
CAUTION:
• Handle O-ring with bare hands. Do not wear gloves.
• Lubricate O-ring with new engine oil.
• Do not clean O-ring with solvent.
• Make sure that O-ring and its mating part 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 while it was being att ached, do not insert it quickly into fuel tube.
• Insert new O-ring straight into fuel tube. Do not twist it.
KBIA2507E
1st step : 12.8 N·m (1.3 kg-m, 9 ft-lb)
2nd step : 24.5 N·m (2.5 kg-m, 18 ft-lb)
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EM-34
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FUEL INJECTOR AND FUEL TUBE
6. Installation of the remaining components is in the reverse order of removal.
INSPECTION AFTER INSTALLATION
After installing the fuel tubes, make sure there are no fuel leaks at the connections using the following steps.
1. Apply fuel pressure to the fuel lines by turning ignition switch ON (with engine stopped). Then check for fuel leaks at the connections.
NOTE:
Use mirrors for checking on hidden points.
2. Start the engine and rev it up and check for fuel leaks at the connections. CAUTION:
Do not touch the engine immediately after stopping, as engine becomes extremely hot.

EM-44
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TIMING CHAIN
b. Apply liquid gasket as shown.Use Genuine RTV Silicone Seal ant or equivalent. Refer to
GI-45, "
Recommended Chemical Product and Sealant".
c. Check again that the timing alignment marks on the timing chain and on each sprocket are aligned. Then install the front cover.
d. Install the bolts in the numerical order shown.
e. After tightening, re-tighten to the specified torque. CAUTION:
Be sure to wipe off any excessive liquid gasket leaking onto
surface mating with oil pan.
11. Install the timing chain case cover RH bank (A) and timing chain case cover LH bank (B) as follows:
• *: Cross mark (c) that can not be seen after assembly
a. Apply liquid gasket (a) as shown. Use Genuine RTV Silicone Seal ant or equivalent. Refer to
GI-45, "
Recommended Chemical Product and Sealant".
CAUTION:
The start and end of the appl ication of the liquid gasket
should be crossed at a position that cannot be seen after
attaching the chain case cover.
b. Install the bolts in the numerical order shown.
12. Install the crankshaft pulley. • Install the key of the crankshaft.
• Insert the pulley by lightly tapping it.
CAUTION:
Do not tap pulley on the side surface where th e belt is installed (outer circumference).
13. Tighten the crankshaft pulley bolt. • Lock the crankshaft using suitable tool, then tighten the bolt.
• Perform the following steps for angular tightening:
a. Apply engine oil onto the threaded parts of the bolt and seating area.
KBIA2517E
M6 × 50 mm (1.97 in) : No. 1, 20, 25, 26, 27
M6 × 80 mm (3.15 in) : No. 4, 5, 7
M6 × 20 mm (0.79 in) : Except the above
KBIA2478E
D : 2.6 - 3.6 mm (0.102 - 0.142 in) dia.
WBIA0800E
WBIA0798E

TIMING CHAINEM-45
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b. Select the one most visible notch of the four on the bolt flange.
Corresponding to the selected notch, put a alignment mark
(such as paint) on the crankshaft pulley.
14. Rotate the crankshaft pulley in normal direction (clockwise when viewed from engine front) to check for parts interference.
15. Installation of the remaining components is in the reverse of order of removal.Crankshaft pulley bolt torque
Step 1 : 93.1 N·m (9.5 kg-m, 69 ft-lb)
Step 2 : additional 90
° (angle tightening)
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CAMSHAFTEM-55
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5. Install the camshaft sprockets using the following procedure:
• A: LH bank shown
a. Install the camshaft sprockets aligning them with the matching marks painted on the timing chain (B) and the camshaft sprock-
ets (C) before removal. Align the camshaft sprocket key groove
with the dowel pin on the camshaft front edge at the same time.
Then temporarily tighten camshaft sprocket bolts.
• Install the intake camshaft sprocket (VTC) (A) and exhaust
camshaft sprockets (B) by select ively using the groove of the
dowel pin according to the bank. (Common part used for both
exhaust banks.)
NOTE:
Use the groove marked "R" for RH bank and "L" for LH bank.
b. Lock the hexagonal part of the camshaft in the same way as for removal, and tighten the camshaft sprocket bolts.
c. Check again that the timing alignment mark on the timing chain and on each sprocket are aligned.
6. Install the chain tensioner using the following procedure: NOTE:
LH is shown.
a. Install the chain tensioner. • Compress the plunger and hold it using a stopper pin wheninstalling.
• Loosen the slack guide side timing chain by rotating the cam- shaft hexagonal part if mounting space is small.
b. Remove the stopper pin and release the plunger, and then apply tension to the timing chain.
c. Install the chain tensioner cover onto the front cover. • Apply liquid gasket as shown.
Use Genuine RTV Silicone Seal ant or equivalent. Refer to
GI-45, "
Recommended Chemical Product and Sealant".
7. Check and adjust valve clearances. Refer to EM-56, "
Va l v e
Clearance".
8. Installation of the remaining components is in the reverse order of removal.
Inspection after InstallationINFOID:0000000003531535
INSPECTION OF CAMSHAFT SPROCKET (INT) OIL GROOVE
CAUTION:
• Perform this inspection only when DTC P0011 is de tected in self-diagnostic results of CONSULT II
and it is directed according to inspect ion procedure of EC section. Refer to EC-159, "
Component
Inspection".
• Check when engine is cold so as to pr event burns from any splashing engine oil.
1. Check engine oil level. Refer to LU-8, "
Inspection".
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Chain tensioner bolts : 6.9 N·m (0.70 kg-m, 61 in-lb)
Tensioner cover bolts : 9.0 N·m (0.92 kg-m, 80 in-lb)KBIA2479E
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