engine INFINITI QX56 2010 Factory Service Manual

DIFFERENTIAL GEAR OILDLN-209
< ON-VEHICLE MAINTENANCE > [FRONT FINAL DRIVE: M205]
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ON-VEHICLE MAINTENANCE
DIFFERENTIAL GEAR OIL
Changing Front Differential Gear OilINFOID:0000000005148916
DRAINING
1. Stop the engine.
2. Remove the drain plug from the front final drive assembly to drain the differential gear oil.
3. Install the drain plug with sealant applied on the thr eads to the front final drive assembly. Tighten to the
specified torque. Refer to DLN-217, "
Disassembly and Assembly".
• Use High Performance Thread Sealant or equivalent. Refer to GI-15, "
Recommended Chemical Prod-
ucts and Sealants".
FILLING
1. Remove the filler plug from the front final drive assembly.
2. Fill the front final drive assembly with new differential gear oil
until the level reaches the specified level near the filler plug hole.
3. Install the filler plug with sealant applied on the threads to the front final drive assembly. Tighten to the specified torque. Refer
to DLN-217, "
Disassembly and Assembly".
• Use High Performance Thread Sealant or equivalent. Refer to GI-15, "
Recommended Chemical Products and Sealants".
Checking Front Differential Gear OilINFOID:0000000005148917
DIFFERENTIAL GEAR OIL LEAKAGE AND LEVEL
1. Make sure that differential gear oil is not leaking from the front final drive assembly or around it.
2. Check the differential gear oil level from the filler plug hole as
shown.
CAUTION:
Do not start engine while checki ng differential gear oil level.
3. Install the filler plug with sealant applied on the threads to the front final drive assembly. Tighten to the specified torque. Refer
to DLN-217, "
Disassembly and Assembly".
• Use High Performance Thread Sealant or equivalent. Refer to GI-15, "
Recommended Chemical Products and Sealants".
Differential gear oil
grade and capacity
: Refer to
MA-13, "
Fluids
and Lubricants".
LDIA0176E
LDIA0176E
Revision: April 20092010 QX56

DLN-236
< PRECAUTION >[REAR FINAL DRIVE: R230]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint Syst
em (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005337663
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:0000000005337662
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: April 20092010 QX56

DLN-244
< ON-VEHICLE MAINTENANCE >[REAR FINAL DRIVE: R230]
DIFFERENTIAL GEAR OIL
ON-VEHICLE MAINTENANCE
DIFFERENTIAL GEAR OIL
Changing Rear Differential Gear OilINFOID:0000000005148930
DRAINING
1. Stop the engine.
2. Remove the drain plug and gasket from the rear final drive
assembly to drain the differential gear oil.
3. Install the drain plug with a new gasket to the rear final drive assembly. Tighten to the specified torque. Refer to DLN-253,
"Disassembly and Assembly".
CAUTION:
Do not reuse gasket.
FILLING
1. Remove the filler plug and gasket from the rear final drive assembly.
2. Fill the rear final drive assembly with new differential gear oil until the level reaches the specified level near the filler plug hole.
3. Install the filler plug with a new gasket on it to the rear final drive assembly. Tighten to the specified torque. Refer to DLN-253,
"Disassembly and Assembly".
CAUTION:
Do not reuse gasket.
Checking Rear Differential Gear OilINFOID:0000000005148931
OIL LEAKAGE AND OIL LEVEL
1. Make sure that differential gear oil is not leaki ng from the rear final drive assembly or around it.
2. Check the differential gear oil level from the filler plug hole as shown.
CAUTION:
Do not start engine while checki ng differential gear oil level.
3. Install the filler plug with a new gasket on it to the rear final drive assembly. Tighten to the specified torque. Refer to DLN-253,
"Disassembly and Assembly".
CAUTION:
Do not reuse gasket.
LLIA0068E
Differential gear oil
grade and capacity : Refer to MA-13, "Fluids and
Lubricants".
LLIA0068E
LLIA0068E
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EC-1
ENGINE
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SECTION EC
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CONTENTS
ENGINE CONTROL SYSTEM
VK56DE
BASIC INSPECTION ....... .............................
8
DIAGNOSIS AND REPAIR WORKFLOW ..... .....8
Trouble Diagnosis Introduction ........................... ......8
INSPECTION AND ADJUSTMENT ....................13
Basic Inspection .................................................. ....13
Idle Speed and Ignition Timing Check ....................17
Procedure After Replacing ECM .............................17
VIN Registration ......................................................17
Accelerator Pedal Released Position Learning .......18
Throttle Valve Closed Position Learning .................18
Idle Air Volume Learning .........................................18
FUNCTION DIAGNOSIS ..............................21
ENGINE CONTROL SYSTEM ........................ ....21
System Diagram .................................................. ....21
Engine Control Component Parts Location .............22
MULTIPORT FUEL INJECTION SYSTEM ..... ....28
System Description ............................................. ....28
ELECTRIC IGNITION SYSTEM ..................... ....31
System Description ............................................. ....31
AIR CONDITIONING CUT CONTROL ...............32
Input/Output Signal Chart .................................... ....32
System Description .................................................32
AUTOMATIC SPEED CONTROL DEVICE
(ASCD) ...............................................................
33
System Description ............................................. ....33
Component Description ...........................................34
CAN COMMUNICATION ....................................35
System Description ............................................. ....35
COOLING FAN CONTROL ................................36
Description ..............................................................36
EVAPORATIVE EMISSION SYSTEM ...............37
Description ........................................................... ....37
INTAKE VALVE TIMING CONTROL ................40
Description ...............................................................40
ON BOARD DIAGNOSTIC (OBD) SYSTEM ....41
Introduction ..............................................................41
Two Trip Detection Logic .........................................41
Emission-related Diagnostic Information .................42
Malfunction Indicator Lamp (MIL) ............................55
OBD System Operation Chart .................................58
CONSULT-III Function (ENGINE) ...........................63
Generic Scan Tool (GST) Function .........................72
COMPONENT DIAGNOSIS .........................74
TROUBLE DIAGNOSIS - SPECIFICATION
VALUE ...............................................................
74
Description ........................................................... ....74
Testing Condition .....................................................74
Inspection Procedure ...............................................74
Diagnosis Procedure ...............................................75
POWER SUPPLY AND GROUND CIRCUIT ....82
Diagnosis Procedure ...............................................82
Ground Inspection ...................................................85
U0101 CAN COMM CIRCUIT ...........................86
Description ...............................................................86
On Board Diagnosis Logic .......................................86
DTC Confirmation Procedure ..................................86
Diagnosis Procedure ...............................................86
U1001 CAN COMM CIRCUIT ...........................87
Description ...............................................................87
On Board Diagnosis Logic .......................................87
DTC Confirmation Procedure ..................................87
Diagnosis Procedure ...............................................87
P0011, P0021 IVT CONTROL ...........................88
On Board Diagnosis Logic .......................................88
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EC-5
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P1140, P1145 IVT CONTROL POSITION
SENSOR ......................................................... ..
295
Component Description ....................................... ..295
On Board Diagnosis Logic ....................................295
DTC Confirmation Procedure ................................295
Diagnosis Procedure .............................................295
Component Inspection ..........................................298
P1148, P1168 CLOSED LOOP CONTROL .....299
On Board Diagnosis Logic .................................. ..299
P1211 TCS CONTROL UNIT ...........................300
Description .......................................................... ..300
On Board Diagnosis Logic ....................................300
DTC Confirmation Procedure ................................300
Diagnosis Procedure .............................................300
P1212 TCS COMMUNICATION LINE ..............301
Description .......................................................... ..301
On Board Diagnosis Logic ....................................301
DTC Confirmation Procedure ................................301
Diagnosis Procedure .............................................301
P1217 ENGINE OVER TEMPERATURE .........302
On Board Diagnosis Logic .................................. ..302
Overall Function Check .........................................302
Diagnosis Procedure .............................................303
Main 13 Causes of Overheating ............................304
P1225 TP SENSOR ..........................................306
Component Description ....................................... ..306
On Board Diagnosis Logic ....................................306
DTC Confirmation Procedure ................................306
Diagnosis Procedure .............................................306
P1226 TP SENSOR ..........................................308
Component Description ....................................... ..308
On Board Diagnosis Logic ....................................308
DTC Confirmation Procedure ................................308
Diagnosis Procedure .............................................308
P1421 COLD START CONTROL .....................310
Description .......................................................... ..310
On Board Diagnosis Logic ....................................310
DTC Confirmation Procedure ................................310
Diagnosis Procedure .............................................310
P1550 BATTERY CURRENT SENSOR ...........312
Component Description ....................................... ..312
On Board Diagnosis Logic ....................................312
DTC Confirmation Procedure ................................312
Diagnosis Procedure .............................................312
Component Inspection ..........................................314
P1551, P1552 BATTERY CURRENT SEN-
SOR ..................................................................
316
Component Description ....................................... ..316
On Board Diagnosis Logic ....................................316
DTC Confirmation Procedure ................................316
Diagnosis Procedure .............................................316
Component Inspection ..........................................318
P1553 BATTERY CURRENT SENSOR ..........320
Component Description ....................................... ..320
On Board Diagnosis Logic .....................................320
DTC Confirmation Procedure ................................320
Diagnosis Procedure .............................................320
Component Inspection ...........................................322
P1554 BATTERY CURRENT SENSOR ..........324
Component Description .........................................324
On Board Diagnosis Logic .....................................324
Overall Function Check .........................................324
Diagnosis Procedure .............................................325
Component Inspection ...........................................326
P1564 ICC STEERING SWITCH .....................328
Component Description .........................................328
On Board Diagnosis Logic .....................................328
DTC Confirmation Procedure ................................328
Diagnosis Procedure .............................................328
Component Inspection ...........................................330
P1564 ASCD STEERING SWITCH .................332
Component Description .........................................332
On Board Diagnosis Logic .....................................332
DTC Confirmation Procedure ................................332
Diagnosis Procedure .............................................332
Component Inspection ...........................................334
P1568 ICC FUNCTION ....................................336
On Board Diagnosis Logic .....................................336
DTC Confirmation Procedure ................................336
Diagnosis Procedure .............................................336
P1572 ICC BRAKE SWITCH ..........................337
Component Description .........................................337
On Board Diagnosis Logic .....................................337
DTC Confirmation Procedure ................................337
Diagnosis Procedure .............................................338
Component Inspection ...........................................343
P1572 ASCD BRAKE SWITCH ......................344
Component Description .........................................344
On Board Diagnosis Logic .....................................344
DTC Confirmation Procedure ................................344
Diagnosis Procedure .............................................345
Component Inspection ...........................................348
P1574 ICC VEHICLE SPEED SENSOR .........349
Component Description .........................................349
On Board Diagnosis Logic .....................................349
DTC Confirmation Procedure ................................349
Diagnosis Procedure .............................................349
P1574 ASCD VEHICLE SPEED SENSOR .....351
Component Description .........................................351
On Board Diagnosis Logic .....................................351
DTC Confirmation Procedure ................................351
Diagnosis Procedure .............................................351
P1805 BRAKE SWITCH .................................353
Description .............................................................353
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EC-7
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CONSULT-lll Reference Va
lue in Data Monitor
Mode ................................................................... ..
422
ECM Harness Connector Terminal Layout ...........425
ECM Terminal and Reference Value ....................425
Wiring Diagram - ENGINE CONTROL SYSTEM - ..435
Fail-Safe Chart .................................................... ..456
DTC Inspection Priority Chart ............................. ..458
DTC Index ........................................................... ..459
Emission-related Diagnostic Information ...............463
SYMPTOM DIAGNOSIS ..... .......................477
ENGINE CONTROL SYSTEM SYMPTOMS .. ..477
Symptom Matrix Chart ........................................ ..477
NORMAL OPERATING CONDITION ...............481
Fuel Cut Control (at No Load and High Engine
Speed) ................................................................. ..
481
PRECAUTION ............................................482
PRECAUTIONS .............................................. ..482
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ..
482
On Board Diagnosis (OBD) System of Engine and
A/T .........................................................................
482
Precaution .............................................................482
PREPARATION .........................................486
PREPARATION .............................................. ..486
Special Service Tool ........................................... ..486
Commercial Service Tool ......................................487
ON-VEHICLE MAINTENANCE ..................489
FUEL PRESSURE ...........................................489
Fuel Pressure Check ........................................... ..489
EVAP LEAK CHECK ......................................491
How to Detect Fuel Vapor Leakage .......................491
ON-VEHICLE REPAIR ...............................493
EVAP CANISTER ............................................493
Removal and Installation ..................................... ..493
Component Inspection ...........................................493
INTAKE VALVE TIMING CONTROL ..............494
Intake Valve Timing Control Solenoid Valve (LH) ..494
Intake Valve Timing Cont rol Solenoid Valve (RH) ..494
Intake Valve Timing Control Position Sensor (LH) ..495
Intake Valve Timing Control Position Sensor (RH) ..495
Camshaft Position Sensor (PHASE) .....................495
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... .......................................... .
497
SERVICE DATA AND SPECIFICATIONS
(SDS) ...............................................................
497
Fuel Pressure ...................................................... ..497
Idle Speed and Ignition Timing ..............................497
Calculated Load Value ..........................................497
Mass Air Flow Sensor ............................................497
Intake Air Temperature Sensor .............................497
Engine Coolant Temperature Sensor ....................497
A/F Sensor 1 Heater ..............................................497
Heated Oxygen sensor 2 Heater ...........................498
Crankshaft Position Sensor (POS) ........................498
Camshaft Position Sensor (PHASE) .....................498
Throttle Control Motor ............................................498
Fuel Injector ...........................................................498
Fuel Pump .............................................................498
Revision: April 20092010 QX56

EC-8
< BASIC INSPECTION >[VK56DE]
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Trouble Diagnosis IntroductionINFOID:0000000005149054
INTRODUCTION
The engine has an ECM to control major systems such as fuel con-
trol, ignition control, idle air control system, etc. The ECM accepts
input signals from sensors and instantly drives actuators. It is essen-
tial that both input and output signals are proper and stable. At the
same time, it is important that there are no malfunctions such as vac-
uum leaks, fouled spark plugs, or
other malfunctions with the engine.
It is much more difficult to diagnose an incident that occurs intermit-
tently rather than continuously. Most intermittent incidents are
caused by poor electric connections or improper wiring. In this case,
careful checking of suspected circuits may help prevent the replace-
ment of good parts.
A visual check only may not find the cause of the incidents. A road
test with CONSULT-III (or GST) or a circuit tester connected should
be performed. Follow the Work Flow on "WORK FLOW" .
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such incidents, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A Di agnostic Worksheet like the example
on "Worksheet Sample" should be used.
Start your diagnosis by looking fo r conventional malfunctions first.
This will help troubleshoot driveability malfunctions on an electroni-
cally controlled engine vehicle.
WORK FLOW
MEF036D
SEF233G
SEF234G
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EC-12
< BASIC INSPECTION >[VK56DE]
DIAGNOSIS AND REPAIR WORKFLOW
There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
bleshooting faster and more accurate.
In general, each customer feels differently about a incident. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the one on the next page in order
to organize all the information for troubleshooting.
Some conditions may cause the MIL to come on steady or blink and
DTC to be detected. Examples:
• Vehicle ran out of fuel, which caused the engine to misfire.
• Fuel filler cap was left off or incorrectly screwed on, allowing fuel to
evaporate into the atmosphere.
Worksheet Sample
SEF907L
MTBL0017
Revision: April 20092010 QX56

INSPECTION AND ADJUSTMENTEC-13
< BASIC INSPECTION > [VK56DE]
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INSPECTION AND ADJUSTMENT
Basic InspectionINFOID:0000000005149055
1.INSPECTION START
1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for scheduled maintenance.
2. Open engine hood and check the following:
- Harness connectors for improper connections
- Wiring harness for improper connections, pinches and cut
- Vacuum hoses for splits, kinks and improper connections
- Hoses and ducts for leaks
- Air cleaner clogging
- Gasket
3. Confirm that electrical or mechanical loads are not applied.
- Headlamp switch is OFF.
- Air conditioner switch is OFF.
- Rear window defogger switch is OFF.
- Steering wheel is in the straight-ahead position, etc.
4. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.
Ensure engine stays below 1,000 rpm.
5. Run engine at about 2,000 rpm for about 2 minutes under no load.
6. Make sure that no DTC is displayed with CONSULT-III or GST.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2.REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnostic Procedure.
>> GO TO 3.
3.CHECK TARGET IDLE SPEED
With CONSULT-III
1. Run engine at about 2,000 rpm for about 2 minutes under no load.
SEF983U
SEF976U
SEF977U
Revision: April 20092010 QX56

EC-14
< BASIC INSPECTION >[VK56DE]
INSPECTION AND ADJUSTMENT
2. Rev engine (2,000 to 3,000 rpm) two or three times under no
load, then run engine at idle speed for about 1 minute.
3. Read idle speed in “DATA MONITOR” mode with CONSULT-III. Refer to EC-17, "
Idle Speed and Ignition
Timing Check" .
Without CONSULT-III
1. Run engine at about 2,000 rpm for about 2 minutes under no load.
2. Rev engine (2,000 to 3,000 rpm) two or three times under no load, then run engine at idle speed for about
1 minute.
3. Check idle speed.
Refer to EC-17, "
Idle Speed and Ignition Timing Check" .
OK or NG
OK >> GO TO 10.
NG >> GO TO 4.
4.PERFORM ACCELERATOR PEDAL RE LEASED POSITION LEARNING
1. Stop engine.
2. Perform EC-18, "
Accelerator Pedal Released Position Learning" .
>> GO TO 5.
5.PERFORM THROTTLE VALVE CL OSED POSITION LEARNING
Perform EC-18, "
Throttle Valve Closed Position Learning" .
>> GO TO 6.
6.PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-18, "
Idle Air Volume Learning" .
Is Idle Air Volume Lear ning carried out successfully?
Ye s o r N o
Ye s > > G O T O 7 .
No >> 1. Follow the instruction of Idle Air Volume Learning. 2. GO TO 4.
7.CHECK TARGET IDLE SPEED AGAIN
With CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Read idle speed in “DATA MONITOR” mode with CONSULT-III. Refer to EC-17, "
Idle Speed and Ignition Timing Check" .
Without CONSULT-III
PBIA8513J
650 ± 50 rpm (in P or N position)
650 ± 50 rpm (in P or N position)
650 ± 50 rpm (in P or N position)
Revision: April 20092010 QX56