sensor INFINITI QX56 2009 Factory Service Manual

EM-54
< ON-VEHICLE REPAIR >
CAMSHAFT
5. Obtain compression TDC of No. 1 cylinder as follows:
a. Turn the crankshaft pulley clockwise to align the TDC identifica-tion notch (without paint mark) with the timing indicator on the
front cover.
b. At this time, make sure both intake and exhaust cam lobes of No. 1 cylinder (top front on LH bank) point outside.
• If they do not point outside, turn crankshaft pulley once more.
6. Disconnect and remove the camshaft position sensor. Refer to EM-44, "
Exploded View".
7. Disconnect and remove the intake valve timing c ontrol position sensor (RH and LH). Refer to EM-44,
"Exploded View".
8. Disconnect and remove the intake valve timing control solenoid valve (RH and LH). Refer to EM-44,
"Exploded View".
9. Remove the intake valve timing control solenoid cover RH bank (A) and intake valve timing control solenoid cover LH bank (B)
as follows:
a. Loosen and remove the bolts in reverse order as shown.
b. Cut the liquid gasket and remove the covers using Tool.
CAUTION:
Do not damage mating surfaces.
10. Paint alignment marks on the RH bank (A) timing chain links (C) and LH bank (B) timing chain links (D) and align with the cam-
shaft sprocket alignment marks (E) and (F).
11. Remove the chain tensioner (LH) using the following steps. WARNING:
Plunger, spring, and spring seat pop out when squeezing return-proof clip without holding
plunger head. It may cause serious injuries. Always hold plunger head when removing.
KBIA2476E
KBIA0400J
Tool number : KV10111100 (J-37228)
AWBIA0815ZZ
AWBIA0154ZZ
Revision: December 20092009 QX56

EM-68
< ON-VEHICLE REPAIR >
CYLINDER HEAD
CYLINDER HEAD
Exploded ViewINFOID:0000000005885894
Removal and InstallationINFOID:0000000005885895
REMOVAL
1. Remove the engine assembly from the vehicle. Refer to EM-78, "Removal and Installation".
2. Remove the following components and related parts: • Drive belt auto tensioner and idler pulley. Refer to EM-14, "
Drive Belt Auto Tensioner and Idler Pulley".
• Generator assembly and bracket. Refer to CHG-20, "
Removal and Installation".
• Thermostat housing and hose. Refer to CO-22, "
Removal and Installation".
• Oil pan and oil strainer. Refer to EM-33, "
Removal and Installation".
• Fuel tube and fuel injector assembly. Refer to EM-40, "
Removal and Installation".
• Intake manifold. Refer to EM-26, "
Removal and Installation".
• Rocker cover. Refer to EM-38, "
Removal and Installation".
3. Remove the crankshaft pulley, front cover, oil pump, and timing chain. Refer to EM-45, "
Removal and
Installation".
4. Remove the camshaft sprockets and camshafts. Refer to EM-53, "
Removal and Installation".
5. Remove the cylinder head bolts in reverse of order shown.
6. Remove the cylinder heads.
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Diameter
1. Harness bracket 2. Engine coolant temperature sensor 3. Washer
4. Cylinder head gasket (LH) 5. Cylinder head (RH) 6. Cylinder head bolt
7. Cylinder head gasket (RH) 8. Cylinder head (LH)
KBIA2528E
PBIC0068E
Revision: December 20092009 QX56

ENGINE ASSEMBLYEM-79
< REMOVAL AND INSTALLATION >
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1. Release the fuel pressure. Refer to
EC-487, "Fuel Pressure Check".
2. Drain the engine coolant. Refer to CO-11, "
Changing Engine Coolant".
3. Drain the engine oil. Refer to LU-9, "
Changing Engine Oil".
4. Disconnect the battery negative and positive terminal. Refer to PG-76, "
Removal and Installation".
5. Remove the engine hood. Refer to DLK-230, "
Removal and Installation of Hood Assembly".
6. Remove the cowl extension. Refer to EXT-18, "
Removal and Installation".
7. Remove the air duct and air cleaner case assembly. Refer to EM-25, "
Removal and Installation".
8. Remove the radiator assembly and hoses. Refer to CO-15, "
Removal and Installation".
NOTE:
To prevent possible A/T fluid drain from transmissi on opening, use appropriate cap to close off transmis-
sion opening during operation.
9. Remove the drive belt. Refer to EM-13, "
Removal and Installation".
10. Remove the fan blade. Refer to CO-18, "
Removal and Installation (Crankshaft Driven Type)".
11. Disconnect the engine room harness from the fuse box and set it aside.
12. Disconnect the ECM.
13. Disconnect the engine room harness from the engine side and set it aside.
14. Disconnect the engine harness grounds.
15. Disconnect the power steering reservoir t ank from the engine and move it aside.
16. Disconnect the power steering oil pump from the engine. Move it aside and secure it using suitable wire or rope. Refer to ST-26, "
Removal and Installation"
17. Remove the A/C compressor bolts and set the compressor aside. Refer to HA-31, "Removal and Installa-
tion for Compressor" (ATC).
18. Disconnect the brake booster vacuum hose.
19. Disconnect the EVAP line.
20. Disconnect the fuel hose at the engine side connection. Refer to EM-40, "
Removal and Installation".
21. Disconnect the heater hoses at the cowl, and in stall plugs to avoid leakage of engine coolant.
22. Remove the A/T oil level indicator and indicator tube upper bolts.
23. Remove the front final drive assembly (4WD only). Refer to DLN-215, "
Removal and Installation".
24. Remove the exhaust manifolds. Refer to EM-30, "
Removal and Installation".
25. Install the engine slingers into the left bank cylinder head and right bank cylinder head.
26. Disconnect and remove the crankshaft position sensor (POS). Refer to EM-82, "
Exploded View".
27. Remove the A/T. Refer to TM-214, "
Removal and Installation
(2WD)" or TM-216, "Removal and Installation (4WD)".
NOTE:
To prevent possible A/T fluid drain from transmission opening,
use appropriate cap to close off transmission opening during
operation.
28. Lift using a hoist and secure the engine in position.
29. Remove the engine assembly from the vehicl e, avoid interference with the vehicle body.
CAUTION:
• Before and during lifting, always check if any harnesses are left connected.
30. Remove the parts that may restrict installation of the engine to the engine stand. NOTE:
This procedure is described assuming that you use an engine stand mounting to the surface to which the
transmission mounts. Engine slinger torque: 45.0 N·m (4.6 kg-m, 33 ft-lb)
WBIA0715E
Revision: December 20092009 QX56

EM-82
< DISASSEMBLY AND ASSEMBLY >
ENGINE UNIT
DISASSEMBLY AND ASSEMBLY
ENGINE UNIT
Exploded ViewINFOID:0000000005885901
1. Knock sensor sub-harness 2. Knock sensor3. Cylinder block
4. Main bearing upper 5. Top ring6. Second ring
7. Oil ring 8. Crankshaft key9. Piston
10. Connecting rod 11. Snap ring12. Piston pin
13. Connecting rod bearing 14. Connecting rod bearing cap 15. Main bearing cap
WBIA0471E
Revision: December 20092009 QX56

ENGINE UNITEM-83
< DISASSEMBLY AND ASSEMBLY >
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Disassembly and AssemblyINFOID:0000000005885902
DISASSEMBLY
NOTE:
Explained here is how to disassemble with engine stand supporting transmission surface. When using differ-
ent type of engine stand, some steps may be different.
1. Remove engine assembly and mount to engine stand. Refer to
EM-78, "
Removal and Installation".
CAUTION:
Before removing the hanging chains, make sure engi ne stand is stable and there is no risk of over-
turning.
2. Drain engine coolant by removing the cylinder block drain plugs “A”, “B”, “C” and “D” as shown.
3. Remove the following components and associated parts (the parts referred to in step 1 are not included here).
• Oil pan (upper and lower) and oil strainer. Refer to EM-33, "
Removal and Installation".
• Crankshaft pulley, front cover and timing chain. Refer to EM-45, "
Removal and Installation".
• Camshaft. Refer to EM-53, "
Removal and Installation".
• Cylinder head. Refer to EM-68, "
Removal and Installation".
4. Remove knock sensor and sub harness. CAUTION:
Carefully handle sensor, avoiding shocks.
5. Check connecting rod side clearance. Refer to EM-90, "
Inspection After Disassembly".
6. Remove piston and connecting rod assembly as follows.
a. Position the crankshaft pin corresponding to the connecting rod to be removed onto bottom dead center.
b. Remove connecting rod cap.
16. Thrust bearing lower 17. Main bearing lower18. Crankshaft
19. Pilot converter 20. Thrust bearing upper21. Side bolt
22. Drive plate 23. Reinforcement plate24. Rear oil seal retainer
25. Rear oil seal 26. Transmission27. O-ring
28. Crankshaft position sensor (POS) 29. Gasket 30. Cylinder block heater
31. Connector cap
WBIA0419E
KBIA2549E
Revision: December 20092009 QX56

EM-90
< DISASSEMBLY AND ASSEMBLY >
ENGINE UNIT
16. Install knock sensors.CAUTION:
If knock sensor is dropped, replace it with a new one.
• Make sure that there is no foreign material on the cylinderblock mating surface and the back surface of knock sensor.
• Install it with its connector facing the center of the cylinder
block side.
• Do not tighten knock sensor bolts while holding connector.
• Make sure knock sensor does not interfere with other parts.
• Position the sub-harness as shown before installing intake manifold.
17. Installation of the remaining components is in the reverse order of removal.
18. Remove engine assembly from engine stand.
19. Install drive plate. • Align dowel pin of crankshaft rear end with pin holes of eachpart to install.
• Install drive plate, reinforcement plate and pilot converter (if not installed in step 4) as shown.
• Face the chamfered or rounded edge side to the crankshaft.
Inspection After DisassemblyINFOID:0000000005885903
CRANKSHAFT END PLAY
KBIA2493E
KBIA2549E
KBIA2494E
KBIA2537E
Revision: December 20092009 QX56

EX-2
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005851832
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harn esses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electri c power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers , always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation After Battery Disconnect
INFOID:0000000005851833
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK ″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery pow er is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated.
4. Perform the necessary repair operation.
Revision: December 20092009 QX56

EX-4
< PREPARATION >
PREPARATION
PREPARATION
PREPARATION
Special Service ToolINFOID:0000000003771779
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Commercial Service ToolINFOID:0000000003771780
Tool number
(Kent-Moore No.)
Tool name Description
KV10114400
(J-38365)
Heated oxygen sensor wrench Loosening or tightening heated oxygen sen-
sors:
a: 22 mm (0.87 in)
S-NT636
(Kent-Moore No.)
Tool name
Description
(J-43897-18)
(J-43897-12)
Oxygen sensor thread cleaner Reconditioning the exhaust system threads
before installing a new heated oxygen sensor
(Use with anti-seize lubricant shown below):
a: J-43897-18 (18 mm, 0.71 in) dia.
b: J-43897-12 (12 mm, 0.47 in) dia.
Anti-seize lubricant (Permatex 133AR
or equivalent meeting MIL specifica-
tion MIL-A-907) Lubricating oxygen sensor thread cleaning
tool when reconditioning exhaust system
threads
Power tool Loosening nuts and bolts
AEM488
AEM489
PBIC0190E
Revision: December 20092009 QX56

EX-6
< ON-VEHICLE REPAIR >
EXHAUST SYSTEM
ON-VEHICLE REPAIR
EXHAUST SYSTEM
Exploded ViewINFOID:0000000004140300
Exhaust System
Removal and InstallationINFOID:0000000003771782
WARNING:
• Perform the operation with the exhaust system fully cooled. The system will be hot just after the
engine stops.
• Be careful not to cut your hand on the heat insulator edge.
CAUTION:
• Be sure to use genuine exhaust system parts or equivalents which are specially designed for heat
resistance, corrosion resistance, and shape.
REMOVAL
Remove exhaust system components using power tool.
• Remove heated oxygen sensor using Tool as needed.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Always replace exhaust gaskets with new ones when reassembling.
AWBIA0667GB
1. Tailpipe hanger bracket 2. Tailpipe3. Gasket
4. Main muffler 5. Right front exhaust tube6. Ring gasket
7. Heated oxygen sensor 2 (bank 2) 8. Heated oxygen sensor 2 (bank 1) 9. Left front exhaust tube
10. Center exhaust tube 11. Muffler hanger bracket front 12. Muffler hanger bracket rear
Front
Tool number KV10114400 (J-38365)
Revision: December 20092009 QX56

EXHAUST SYSTEMEX-7
< ON-VEHICLE REPAIR >
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• Before installing a new heated o
xygen sensor, clean and lube the exhaust tube threads using suit-
able tool.
• Discard any heated oxygen sensor which has been dr opped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a co ncrete floor; replace with a new one.
• Do not over-tighten the heated oxygen sensor. Doing so may damage the heated oxygen sensor, resulting in the MIL coming on.
• If any mounting insulator is badly deformed, repair or replace it. If deposits such as mud pile up on
the mounting insulators, clean and inspect them.
• Temporarily tighten the nuts on the exhaust manifold side and th e bolts on the vehicle side. Check
each part for interference with other components, an d then tighten the nuts and bolts to specifica-
tion.
INSPECTION AFTER INSTALLATION
• With the engine running, check exhaust tube joints for gas leakage and unusual noises.
• Check to ensure that mounting brackets and mount ing rubbers are installed properly and free from undue
stress. Improper installation could resu lt in excessive noise and vibration.
Oxygen sensor thread cleaner A: (J-43897-18)
Oxygen sensor thread cleaner B: (J-43897-12)
Revision: December 20092009 QX56