check engine INFINITI QX56 2009 Factory Service Manual

FL-4
< PRECAUTION >
FUEL SYSTEM
FUEL SYSTEM
General PrecautionINFOID:0000000003771769
WARNING:
When replacing fuel line parts, be sure to observe the following.
• Put a “CAUTION: INFLAMMABLE” sign in the workshop.
• Be sure to work in a well ventilate d area and furnish workshop with a CO
2 fire extinguisher.
• Do not smoke while servicing fuel system. Keep open flames and sparks away from the work area.
CAUTION:
• Before removing fuel line parts, carry out the following procedures:
- Put drained fuel in an explosi on-proof container and put the lid on securely. Keep the container in
safe area.
- Release fuel pressure from the fuel lines. Refer to EC-487, "
Fuel Pressure Check" .
- Disconnect the battery negative terminal.
• Always replace O-rings and clamps with new ones.
• Do not kink or twist hoses when they are being installed.
• After connecting the fuel t ube quick connectors, make sure
the quick connectors are secure.
Ensure that the connector and resin tube do not contact any
adjacent parts.
• After installing tubes, make su re there is no fuel leakage at
connections in the following steps.
- Apply fuel pressure to fuel lines with turning ignition switch
ON (with engine stopped). Th en check for fuel leaks at con-
nections.
- Start the engine and rev it up and check for fuel leaks at con-
nections.
• Use only a Genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may come on.
• For servicing “Evaporative Emission System” parts, refer to EC-491, "
Removal and Installation" .
• For servicing “On Board Refueling Vapor Recovery (ORVR)”
parts, refer to EC-489, "
How to Detect Fuel Vapor Leakage" .
PBIC1268E
Revision: December 20092009 QX56

FL-10
< REMOVAL AND INSTALLATION >
FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY
- After connecting the quick connector, make sure that the connec-
tion is secure by checking as follows:
- Pull the tube and the connector to make sure they are securely
connected.
- Visually inspect the connector to make sure the two retainer tabs are securely connected.
INSPECTION AFTER INSTALLATION
1. Turn the ignition switch ON but do not start engi ne, then check the fuel pipes and hose connections for
leaks while applying fuel pressure to the system.
2. Start the engine and rev it above idle speed, then check t hat there are no fuel leaks at any of the fuel pipe
and hose connections.
PBIC1653E
Revision: December 20092009 QX56

FUEL TANKFL-15
< REMOVAL AND INSTALLATION >
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21. If necessary, remove the lock ring using Tool.
22. If necessary, remove the fuel level sensor, fuel filter, and fuel
pump assembly. Discard the fuel level sensor, fuel filter, and fuel
pump assembly O-ring.
CAUTION:
• Do not bend the float arm during removal.
• Avoid impacts such as droppi ng when handling the com-
ponents.
INSTALLATION
Installation is in the reverse order of removal.
• For installation, use a new fuel level sensor, fuel filter, and fuel pump assembly O-ring.
• Connect the quick connector as follows:
- Check the connection for any damage or foreign materials.
- Align the connector with the pipe, t hen insert the connector straight into the pipe until a click is heard.
- After connecting the quick connector, make sure that the connec-
tion is secure by checking as follows:
- Pull the tube and the connector to make sure they are securely connected.
- Visually inspect the connector to make sure the two retainer tabs are securely connected.
INSPECTION AFTER INSTALLATION
1. Turn the ignition switch ON but do not start en gine, then check the fuel pipe and hose connections for
leaks while applying fuel pressure.
2. Start the engine and rev it above idle, then check that there are no fuel leaks at any of the fuel pipe and
hose connections. Tool number : — (J-46536)
LBIA0389E
PBIC1653E
Revision: December 20092009 QX56

PRECAUTIONSFSU-3
< PRECAUTION >
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5. When the repair work is completed, return the ignition switch to the ″LOCK ″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of al l control units using CONSULT-III.
PrecautionINFOID:0000000003772265
• When installing the rubber bushings, the final tightening must be done under unladen condition and with the
tires on level ground. Oil will shorten the life of the rubber bushings, so wipe off any spilled oil immediately.
• Unladen condition means the fuel tank, engine coolant and lubricants are at the full specification. The spare
tire, jack, hand tools, and mats are in their designated positions.
• After installing suspension components, check the wheel alignment.
• Lock nuts are not reusable. Always use new lock nuts for installation. New lock nuts are pre-oiled, do not
apply any additional lubrication.
Revision: December 20092009 QX56

FSU-8
< ON-VEHICLE MAINTENANCE >
ON-VEHICLE SERVICE
• Always perform the following procedure on a flat surface.
• Make sure that no person is in front of the vehicle before pushing it.
1. Bounce the front of vehicle up and down to stabilize the vehicle height (posture).
2. Push the vehicle straight ahead about 5 m (16 ft).
3. Put a mark on base line of the tread (rear side) of both front tires at the same height as hub center as shown. These marks are
measuring points.
4. Measure the distance (A) on the rear side of the front tires as shown.
5. Push the vehicle slowly ahead to rotate the wheels 180 °
degrees (1/2 a turn).
CAUTION:
If the wheels have rotated more than 180 ° degrees (1/2
turn), start this procedure again from the beginning. Never
push the vehicle backward.
6. Measure the distance (B) on the front side of the front tires at the
same marks as shown. Total toe- in is calculated as (A) - (B).
7. Adjust the toe-in by varying the length of the steering outer socket.
a. Loosen the outer tie-rod lock nuts.
b. Adjust the toe-in by screwing the outer tie-rods in or out.
c. Tighten the outer tie-rod lock nuts to specification.
FRONT WHEEL TURNING ANGLE
NOTE:
Check front wheel turning angle after the toe-in inspection.
1. Place front wheels on turning radius gauges in straight ahead position and rear wheels on stands so that vehicle can be level.
Check the maximum inner and outer wheel turning angles for LH
and RH road wheels.
2. Start engine and run at idle, turn steering wheel all the way right and left, measure the turning angle.
AFA050
Total toe-in : Refer to FSU-23, "Wheel Alignment (Un-
laden*1)" .
SFA234AC
Standard length (L) : Refer to ST-37, "Steering Outer
Socket and Inner Socket" .
Lock nut : Refer to FA X - 9 , "
Removal and In-
stallation" .
SGIA0167E
Wheel turning angle
(full turn) : Refer to
FSU-23, "Wheel
Alignment (Unladen*1)".
SFA439BA
Revision: December 20092009 QX56

STABILIZER BARFSU-15
< REMOVAL AND INSTALLATION >
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STABILIZER BAR
Removal and InstallationINFOID:0000000003772275
REMOVAL
1. Remove engine under cover using power tool.
2. Remove stabilizer bar mounting bracket bolts and connecting rod nuts using power tool, as shown.
3. Remove bushings from stabilizer bar.
INSPECTION AFTER REMOVAL
• Check stabilizer bar for twist and deformation. Replace if necessary.
• Check rubber bushing for cracks, wear and deterioration. Replace if necessary.
INSTALLATION
Installation is in the reverse order of removal.
• Tighten all nuts and bolts to specification. Refer to FSU-13, "
Component" .
LEIA0094E
Revision: December 20092009 QX56

GI-1
GENERAL INFORMATION
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CONTENTS
GENERAL INFORMATION
HOW TO USE THIS MANU AL ......................3
HOW TO USE THIS MANUAL ....................... .....3
Description .......................................................... ......3
Terms ........................................................................3
Units ..........................................................................3
Contents ....................................................................3
Relation between Illustrations and Descriptions .......4
Components ..............................................................4
HOW TO FOLLOW TROUBLE DIAGNOSES .....6
Description ................................................................6
How to Follow Test Groups in Trouble Diagnosis ......6
Key to Symbols Signifying Measurements or Pro-
cedures ............................................................... ......
7
HOW TO READ WIRING DIAGRAMS ................9
Connector symbols ............................................. ......9
Sample/wiring diagram -example- ...........................10
Description ..............................................................11
ABBREVIATIONS .......................................... ....13
Abbreviation List .................................................. ....13
TIGHTENING TORQUE OF STANDARD
BOLTS ................................................................
14
Tightening Torque Table .........................................14
RECOMMENDED CHEMICAL PRODUCTS
AND SEALANTS ............................................ ....
15
Recommended Chemical Products and Sealants ....15
TERMINOLOGY .................................................16
SAE J1930 Terminology List ............................... ....16
FEATURES OF NEW MODEL .....................20
IDENTIFICATION INFORMATION .....................20
Model Variation ................................................... ....20
Identification Number ..............................................21
Identification Plate ...................................................22
Dimensions .............................................................23
Wheels & Tires .................................................... ....23
PRECAUTION ..............................................24
PRECAUTIONS .................................................24
Description ........................................................... ....24
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................
24
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ...................................
24
Procedures without Cowl Top Cover .......................25
General Precautions ................................................25
Three Way Catalyst .................................................27
Precaution for Fuel (Unleaded Premium Gasoline
Recommended) .......................................................
27
Multiport Fuel Injection System or Engine Control
System .....................................................................
27
Hoses ......................................................................27
Engine Oils ..............................................................28
Air Conditioning .......................................................29
LIFTING POINT .................................................30
Pantograph Jack ......................................................30
Garage Jack and Safety Stand ................................30
2-Pole Lift ................................................................30
TOW TRUCK TOWING .....................................32
Tow Truck Towing ...................................................32
Vehicle Recovery (Freeing a stuck vehicle) ............33
BASIC INSPECTION ...................................34
SERVICE INFORMATION FOR ELECTRICAL
INCIDENT ..........................................................
34
Work Flow ............................................................ ....34
Control Units and Electrical Parts ............................34
How to Check Terminal ...........................................35
Intermittent Incident ............................................. ....38
Circuit Inspection .....................................................41
CONSULT-III CHECKING SYSTEM .................46
Revision: December 20092009 QX56

TERMINOLOGYGI-17
< HOW TO USE THIS MANUAL >
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Exhaust gas recirculation control-BPT
valve EGRC-BPT valve
BPT valve
Exhaust gas recirculation control-solenoid
valve EGRC-solenoid valve
EGR control solenoid valve
Exhaust gas recirculation temperature sen-
sor EGRT sensorExhaust gas temperature sensor
EGR temperature sensor
Flash electrically erasable programmable
read only memory FEEPROM
***
Flash erasable programmable read only
memory FEPROM
***
Flexible fuel sensor FFS***
Flexible fuel system FF system***
Fuel pressure regulato r*** Pressure regulator
Fuel pressure regulator control solenoid
valve ***
PRVR control solenoid valve
Fuel trim FT***
Heated Oxygen sensor HO2S Exhaust gas sensor
Idle air control system IAC system Idle speed control
Idle air control valve-air regulato rIACV-air regulator Air regulator
Idle air control valve-auxiliary air control
valve IACV-AAC valve
Auxiliary air control (AAC) valve
Idle air control valve-FICD solenoid valve IACV-FICD solenoid valve FICD solenoid valve
Idle air control valve-idle up control sole-
noid valve IACV-idle up control solenoid valve Idle up control solenoid valve
Idle speed control-FI pot ISC-FI pot FI pot
Idle speed control system ISC system***
Ignition control IC***
Ignition control module ICM***
Indirect fuel injection system IFI system ***
Intake air IA Air
Intake air temperature sensor IAT sensor Air temperature sensor
Knock *** Detonation
Knock sensor KS Detonation sensor
Malfunction indicator lamp MIL Check engine light
Manifold absolute pressure MAP ***
Manifold absolute pressure sensor MAPS ***
Manifold differential pressure MDP ***
Manifold differential pressure sensor MDPS ***
Manifold su rface temperature MST ***
Manifold surface temperature sensor MSTS ***
Manifold vacuum zone MVZ ***
Manifold vacuum zone sensor MVZS***
Mass air flow sensor MAFS Air flow meter
Mixture control solenoid valve MC solenoid valveAir-fuel ratio control solenoid valve
Multiport fuel injection System MFI system Fuel injection control
NEW TERM
NEW ACRONYM /
ABBREVIATION OLD TERM
Revision: December 20092009 QX56

IDENTIFICATION INFORMATIONGI-21
< FEATURES OF NEW MODEL >
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Identification NumberINFOID:0000000003771190
VEHICLE IDENTIFICATION NUMBER ARRANGEMENT
1. Emission control information label 2. F.M.V.S.S./C.M.V.S.S. certification label 3. Tire placard
4. Vehicle identification number plate 5. Air conditioning specfication label
AWAIA0026GB
Position Character Qualifier Definition
1 5N1 Manufacturer 5N1: USA produced multi-purpose vehicle
2
3
4 A Engine type A: VK56DE
5 A0 Vehicle line A0: Infiniti QX56
6
7 8 Body type 8: 4 door wagon
8C Gross vehicle
weight ratingC: 4WD, 4-wheel ABS, Class F
D: 2WD, 4-wheel ABS, Class F
9 * Check digit (0 to 9 or X) The code for the check digit is determined by a mathematical com-
putation.
10 9 Model year 2009
11 NManufacturing
plant
N: Canton Mississippi
12
XXXXXX Vehicle serial num-
ber Chassis number
13
14
15
16
17
Revision: December 20092009 QX56

PRECAUTIONSGI-25
< PRECAUTION >
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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.
5. When the repair work is completed, return the ignition switch to the ″LOCK ″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of al l control units using CONSULT-III.
Procedures without Cowl Top CoverINFOID:0000000003771198
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
General PrecautionsINFOID:0000000003771199
• Do not operate the engine for an extended period of time without
proper exhaust ventilation.
Keep the work area well ventilated and free of any inflammable
materials. Special care should be taken when handling any inflam-
mable or poisonous materials, such as gasoline, refrigerant gas,
etc. When working in a pit or ot her enclosed area, be sure to prop-
erly ventilate the area before working with hazardous materials.
Do not smoke while working on the vehicle.
• Before jacking up the vehicle, apply wheel chocks or other tire blocks to the wheels to prevent t he vehicle from moving. After jack-
ing up the vehicle, support the vehicle weight with safety stands at
the points designated for proper lifting before working on the vehi-
cle.
These operations should be done on a level surface.
• When removing a heavy component such as the engine or tran-
saxle/transmission, be careful not to lose your balance and drop
them. Also, do not allow them to strike adjacent parts, especially
the brake tubes and master cylinder.
PIIB3706J
SGI285
SGI231
Revision: December 20092009 QX56