2011 INFINITI QX56 ignition

EM-102
< UNIT REMOVAL AND INSTALLATION >
ENGINE ASSEMBLY
INSTALLATION
Install 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 mi ssing dowels may cause vibration, oil leaks or
breakage of drivetrain components.
InspectionINFOID:0000000006289578
INSPECTION AFTER INSTALLATION
Inspection for Leakage
The following are procedures for checking fluid leakage, lubricant leakage. Before starting engine, check oil/fluid levels includi ng engine coolant and engine oil. If any are less than the
required quantity, fill them to the specified level. Refer to MA-10, "
Fluids and Lubricants".
 Follow the procedure below to check for fuel leakage.
- Turn ignition switch to the “ON” position (with engi ne stopped). With fuel pressure applied to fuel piping,
check for fuel leakage at connection points.
- Start engine. With engine speed increased, che ck again for fuel leakage at connection points.
 Run engine to check for unusual noise and vibration. NOTE:
If hydraulic pressure inside chain tensioner drops af ter removal/installation, slack in guide may generate a
pounding noise during and just after the engine start. However, this does not indicate a malfunction. The
noise will stop after hydraulic pressure rises.
 Warm up engine thoroughly to check that there is no leak age of fuel, or any oil/fluids including engine oil and
engine coolant.
 Bleed air from lines and hoses of applic able lines, such as in cooling system.
 After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill them to
the specified level, if necessary.
Summary of the inspection items:
*: Power steering fluid, brake fluid, etc. Items Before starting engine Engine running After engine stopped
Engine coolant Level Leakage Level
Engine oil Level Leakage Level
Transmission /
transaxle fluid AT & CVT Models Leakage Level / Leakage Leakage
MT Models Level / Leakage Leakage Level / Leakage
Other oils and fluids* Level Leakage Level
Fuel Leakage Leakage Leakage
Exhaust gases — Leakage —
Revision: 2010 May2011 QX56

ENGINE STAND SETTINGEM-103
< UNIT DISASSEMBLY AND ASSEMBLY >
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UNIT DISASSEMBLY AND ASSEMBLY
ENGINE STAND SETTING
SettingINFOID:0000000006289579
NOTE:
Explained here is how to disassemble with engine stand s
upporting transmission surface. When using a differ-
ent type of engine stand, note the difference in the steps, etc.
1. Remove the engine assembly from the vehicle. Refer to EM-98, "
Exploded View".
2. Remove crankshaft pulley. Refer to EM-96, "
FRONT OIL SEAL : Removal and Installation".
NOTE:
The drive plate is fixed with a ring gear stopper [SST: KV10119200 (J-49277)]. Loosen the crankshaft pul-
ley mounting bolts before installing the engine stand.
3. Remove the parts that may restrict installation of engine to a widely used engine stand.  Fix crankshaft with a ring gear stopper [SST: KV10119200 (J-49277)]. Loosen drive plate mounting bolt
with power tool.
 Check for deformation or damage of drive plate. Refer to EM-115, "
Inspection".
NOTE:
The procedure is described assuming that you us e a widely used engine stand holding the surface, to
which transmission is installed.
4. Remove pilot converter using the pilot bushing puller (commercial service tool), if necessary.
5. Lift the engine with hoist to inst all it onto the widely used engine stand.
CAUTION:
Use an engine stand that has a load capacity [240 kg (529 lb) or more] large enough for supporting
the engine weight.
 If the load capacity of the stand is not adequate, remove the following parts beforehand to reduce the potential risk of overturning the stand.
- Remove intake manifold. Refer to EM-30, "
Exploded View".
- Remove fuel injector and fuel tube assembly. Refer to EM-48, "
Exploded View".
- Remove ignition coil. Refer to EM-29, "
Exploded View".
- Remove rocker cover. Refer to EM-33, "
Exploded View".
- Remove exhaust manifold. Refer to EM-40, "
Exploded View".
- Other removable brackets. NOTE:
The figure shows an example of widely used engine stand (A)
that can hold mating surface of transmission with drive plate
removed.
CAUTION:
Before removing the hang ing chains, check the engine
stand is stable and there is no risk of overturning.
6. Drain engine oil. Refer to LU-8, "
Draining".
JPBIA0190ZZ
Revision: 2010 May2011 QX56

ENGINE UNITEM-105
< UNIT DISASSEMBLY AND ASSEMBLY >
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ENGINE UNIT
DisassemblyINFOID:0000000006289580
1. Remove intake manifold. Refer to
EM-30, "Exploded View".
2. Remove exhaust manifold. Refer to EM-40, "
Exploded View".
3. Remove oil pan (lower). Refer to EM-54, "
Exploded View".
4. Remove ignition coil and spark plug. Refer to EM-23, "
Exploded View".
5. Remove rocker cover. Refer to EM-33, "
Exploded View".
6. Remove timing chain. Refer to EM-61, "
Exploded View".
7. Remove exhaust camshaft and VVEL ladder assembly. Refer to EM-74, "
Exploded View".
8. Remove cylinder head. Refer to EM-86, "
Exploded View".
AssemblyINFOID:0000000006289581
Assemble in the reverse order of disassembly.
Revision: 2010 May2011 QX56

PRECAUTIONSEXL-5
< PRECAUTION > [XENON TYPE]
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006450052
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 severi ty 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 whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision that would result in air ba g 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 unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.
 Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied 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 Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, DO NOT use air or electric 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 minutes before performing any service.
Revision: 2010 May2011 QX56

EXL-10
< SYSTEM DESCRIPTION >[XENON TYPE]
SYSTEM
SYSTEM
HEADLAMP SYSTEM
HEADLAMP SYSTEM : System DiagramINFOID:0000000006213894
HEADLAMP SYSTEM : System DescriptionINFOID:0000000006213895
OUTLINE
Headlamp is controlled by combination switch r
eading function and headlamp control function of BCM, and
relay control function of IPDM E/R.
HEADLAMP (LO) OPERATION
 BCM detects the combination switch conditi on with the combination switch reading function.
 BCM transmits the low beam request signal to IPDM E/R via CAN communication according to the head-
lamp (LO) ON condition.
Headlamp (LO) ON condition- Lighting switch 2ND
- Lighting switch AUTO (auto light function ON judgment)
- Lighting switch AUTO, with the front fog la mp switch ON and the ignition switch ON
- Lighting switch PASS
 IPDM E/R turns the integrated headlamp low relay ON , and turns the headlamp ON according to the low
beam request signal.
HEADLAMP (HI) OPERATION
 BCM transmits the high beam request signal to IPDM E/R and the combination meter via CAN communica- tion according to the headlamp (HI) ON condition.
Headlamp (HI) ON condition
- Lighting switch HI with the lighting switch 2ND or AUTO (auto light function ON judgment)
- Lighting switch PASS
- Lighting switch AUTO, with the front fog lamp swit ch ON, the ignition switch ON and lighting switch HI
 Combination meter turns the high beam indicator lamp ON according to the high beam request signal.
 IPDM E/R turns the integrated headlamp high relay ON , and turns the headlamp ON according to the high
beam request signal.
HEADLAMP SYSTEM : Fail-safeINFOID:0000000006213896
CAN COMMUNICATION CONTROL
When CAN communication with BCM is impossible, IPDM E/R performs fail-safe control. After CAN communi-
cation recovers normally, it also returns to normal control.
If No CAN Communication Is Available With BCM
JMLIA1083GB
Revision: 2010 May2011 QX56

SYSTEMEXL-11
< SYSTEM DESCRIPTION > [XENON TYPE]
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*: With daytime running light system
AUTO LIGHT SYSTEM
AUTO LIGHT SYSTEM : System DiagramINFOID:0000000006213897
AUTO LIGHT SYSTEM : System Description (For CANADA)INFOID:0000000006218912
OUTLINE
 Auto light system is controlled by each function of BCM and IPDM E/R.
Control by BCM- Combination switch reading function
- Headlamp control function
- Auto light function
- Delay timer function
- Wiper linked auto lighting function
- Auto light adjustment system
Control by IPDM E/R
- Relay control function
 Auto light system has the auto light function, wiper linked auto lighting function and delay timer function.
- Auto light function automatically turns ON/OFF the exterior lamps* and each illumination automatically,
depending on the outside brightness.
- Wiper linked auto lighting function automatically tu rns ON/OFF the exterior lamps* and each illumination
when the light switch is in the AUTO posit ion, according to a front wiper operation.
- When auto light system turns the exterior lamps ON wit h the ignition switch OFF, delay timer function turns
the exterior lamps OFF, depending on the vehicle condition with the auto light function after a certain period
of time.
*: Headlamp (LO/HI), parking lamp, side marker lamp, tail lamp and front fog lamp (Headlamp HI and front fog
lamp depend on the combination switch condition.)
AUTO LIGHT FUNCTION
 BCM detects the combination switch conditi on with the combination switch reading function.
 BCM supplies voltage to optical sensor when the ignition switch is turned ON or ACC.
 Optical sensor converts outside brightness (lux) to voltage and transmits the optical sensor signal to BCM.
 BCM judges outside brightness from the optical sens or signal and judges ON/OFF condition of the exterior
lamp and each illumination according to the outside brightness.
Control part Fail-safe operation
Headlamp  Turns ON the headlamp low relay when the ignition switch is turned ON
 Turns OFF the headlamp low relay when the ignition switch is turned OFF
 Headlamp high relay OFF
JMLIA1254GB
Revision: 2010 May2011 QX56

EXL-12
< SYSTEM DESCRIPTION >[XENON TYPE]
SYSTEM
 BCM transmits each request signal to IPDM E/R wit
h CAN communication according to ON/OFF condition
by the auto light function.
NOTE:
ON/OFF timing differs based on the sensit ivity from the setting. The setting can be set by CONSULT-III. Refer
to EXL-23, "
HEADLAMP : CONSULT-III Function (BCM - HEAD LAMP)".
AUTO LIGHT ADJUSTMENT SYSTEM
The auto light adjustment system automatically, dims/bri ghtens the display and combination meter, according
to brightness outside the vehicle, when lighting switch 1ST or lighting switch 2ND is operated. Refer to INL-11,
"AUTO LIGHT ADJUSTMENT SYSTEM : System Description".
DELAY TIMER FUNCTION
BCM turns the exterior lamp OFF depending on the vehicle condition with the auto light function when the igni-
tion switch is turned OFF.
 Turns the exterior lamp OFF 5 minutes afte r detecting that any door opens. (Door switch ON).
 Turns the exterior lamp OFF a certain period of time* after closing all doors. (Door switch ON →OFF).
 Turns the exterior lamp OFF with the igni tion switch ACC or the light switch OFF.
*: The preset time is 45 seconds. The timer operat ing time can be set by CONSULT-III. Refer to EXL-23,
"HEADLAMP : CONSULT-III Function (BCM - HEAD LAMP)".
NOTE:
When any position other than the light switch AUTO is set, the auto light system function switches to the exte-
rior lamp battery saver function.
AUTO LIGHT SYSTEM : System De scription (Except for CANADA)INFOID:0000000006218908
OUTLINE
 Auto light system is controlled by each function of BCM and IPDM E/R.
Control by BCM- Combination switch reading function
- Headlamp control function
- Auto light function
- Delay timer function
- Wiper linked auto lighting function
- Auto light adjustment system
Control by IPDM E/R- Relay control function
 Auto light system has the auto light function (with twilight lighting function), wiper linked auto lighting function
and delay timer function.
- Auto light function automatically turns ON/OFF the exterior lamps* and each illumination automatically,
depending on the outside brightness.
- Wiper linked auto lighting function automatically turn s ON/OFF the exterior lamps* and each illumination
when the light switch is in the AUTO posit ion, according to a front wiper operation.
- When auto light system turns the exterior lamps ON with the ignition switch OFF, delay timer function turns the exterior lamps OFF, depending on the vehicle conditi on with the auto light function after a certain period
of time.
*: Headlamp (LO/HI), parking lamp, side marker lamp, tail lamp and front fog lamp (Headlamp HI and front fog
lamp depend on the combination switch condition.)
NOTE:
The settings of the twilight lighting function and the wiper linked auto lighting function can be changed with
CONSULT-III. Refer to EXL-23, "
HEADLAMP : CONSULT-III Function (BCM - HEAD LAMP)".
AUTO LIGHT FUNCTION (WITH TWILIGHT LIGHTING FUNCTION)
Description
 BCM detects the combination switch conditi on with the combination switch reading function.
 BCM supplies voltage to the optical sensor when the ignition switch is turned ON or ACC.
 Optical sensor converts outside brightness (lux) to voltage and transmits the optical sensor signal to BCM.
 When ignition switch is turned ON, BCM detects out side brightness from the optical sensor signal and
judges ON/OFF condition of the exterior lamp and each illumination, depending on the outside brightness
condition (standard or twilight).
Revision: 2010 May2011 QX56

SYSTEMEXL-13
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 BCM transmits each request signal to IPDM E/R via CAN communication, according to ON/OFF condition by
the auto light function.
NOTE:
As to ON/OFF timing, the sensitivity depends on sett ings. The settings can be changed with CONSULT-III.
Refer to EXL-23, "
HEADLAMP : CONSULT-III F unction (BCM - HEAD LAMP)".
Auto Lighting Timing Table
When the light switch is in AUTO position and the ignition switch is ON, the exterior lamps turns ON/OFF in the
following condition.
Standard Light ON
BCM turns exterior lamps ON when outside brightness obtained from the optical sensor signal is 1250 lx or
less for 3 seconds or more. And BCM turns exterior lamp OFF when outside brightness from the optical sen-
sor signal is 2500 lx or more for 5 seconds or more.
Twilight Light ON (Twili ght Lighting Function)
BCM detects twilight by filtered brightness.
 BCM filters outside brightness to block the impact of the rapid change in brightness, based on the optical
sensor signal, and judges outside brightness.
 BCM detects changes in outside brightness, based on outside brightness obtained from the optical sensor
signal and filtered brightness and judges ON/OFF of the exterior lamps.
Filtering chart
 BCM starts filtering 0.3 seconds after the ignition swit ch is turned ON and the light switch is turned to AUTO.
 BCM filters signals from the optical sensor at intervals of 2 seconds.When the filtered brightness is higher
than outside brightness (signal from the optical sens or), BCM decreases the filtered brightness by 20
lx
*.When the filtered brightness is lower than outside bri ghtness, BCM increases the filtered brightness by 20
lx
*.
 BCM turns ON the exterior lamps when filtered brightness reaches 3000 lx and turns OFF when reaching 5000 lx.
*:When vehicle speed is 5 km/h or less, BCM decr eases/increases the filtered brightness by 5 lx.
WIPER LINKED AUTO LIGHTING FUNCTION
BCM turns the exterior lamp ON when detecting 4 operations of the front wiper work the light switch in AUTO
position.
NOTE:
BCM turns OFF the headlamps 3 seconds after the front wiper switch is turned from HI⇒OFF.
Exterior lamps Standard Light ON
(Sudden increase/decrease in brightness) Twilight Light ON
(Gradual increase/decrease in brightness)
ON Outside brightness is 1250 lx or less for 3
seconds or more.Filtered brightness is 3000 lx or less
OFF Outside brightness is 2500 lx or more for 5
seconds or more.
Filtered brightness is 5000 lx or more
JPLIA1827GB
Revision: 2010 May2011 QX56