check engine INFINITI QX56 2007 Factory Service Manual

FSU-2
< SERVICE INFORMATION >
PRECAUTIONS
SERVICE INFORMATION
PRECAUTIONS
PrecautionINFOID:0000000003532631
• 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.

FSU-8
< SERVICE INFORMATION >
ON-VEHICLE SERVICE
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.
• Any turning angles are not adjustable. If any of steering angles
are out of the specification, check if the following parts are
worn or damaged.
- Steering gear
AFA050
Total toe-in : Refer to FSU-19, "Wheel Alignment (Un-
laden*1) *6".
SFA234AC
Standard length “L” : Refer to PS-26, "Steering Outer
Socket and Inner Socket".
Lock nut : Refer to PS-15, "
Removal and In-
stallation".
SGIA0167E
Wheel turning angle
(full turn): Refer to FSU-19, "Wheel
Alignment (Unladen*1) *6".
SFA439BA

FSU-12
< SERVICE INFORMATION >
STABILIZER BAR
STABILIZER BAR
Removal and InstallationINFOID:0000000003532640
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-5, "
Component" .
LEIA0094E

GI-1
GENERAL INFORMATION
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CONTENTS
GENERAL INFORMATION
SERVICE INFORMATION ............................2
PRECAUTIONS ...................................................2
Description ................................................................2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
2
Precaution for NVIS/IVIS (NISSAN/INFINITI VE-
HICLE IMMOBILIZER SYSTEM - NATS) (If
Equipped) ..................................................................
2
General Precaution ...................................................3
Precaution for Three Way Catalyst ...........................4
Precaution for Fuel (Unleaded Premium Gasoline
Required) ..................................................................
4
Precaution for Multiport Fuel Injection System or
Engine Control System .............................................
5
Precaution for Hoses .................................................5
Precaution for Engine Oils ........................................6
Precaution for Air Conditioning .................................6
HOW TO USE THIS MANUAL ............................7
Description ................................................................7
Terms ........................................................................7
Units ..........................................................................7
Relation between Illustrations and Descriptions .......7
Contents ....................................................................8
Component ................................................................8
How to Follow Trouble Diagnosis ..............................9
How to Read Wiring Diagram ..................................13
Abbreviations ..........................................................20
SERVICE INFORMATION FOR ELECTRICAL
INCIDENT ...........................................................
22
How to Check Terminal ...........................................22
How to Perform Efficient Diagnosis for an Electri-
cal Incident ..............................................................
25
Control Units and Electrical Parts ............................32
CONSULT-II CHECKING SYSTEM ..................35
Description ...............................................................35
Function and System Application ............................35
Nickel Metal Hydride Battery Replacement .............36
Checking Equipment ...............................................36
CONSULT-II Start Procedure ..................................36
CONSULT-II Data Link Connector (DLC) Circuit .....38
LIFTING POINT .................................................40
Pantograph Jack ......................................................40
Garage Jack and Safety Stand ................................40
2-Pole Lift ................................................................40
TOW TRUCK TOWING .....................................42
Tow Truck Towing ...................................................42
Vehicle Recovery (Freeing a stuck vehicle) ............43
TIGHTENING TORQUE OF STANDARD
BOLTS ...............................................................
44
Tightening Torque Table .........................................44
RECOMMENDED CHEMICAL PRODUCTS
AND SEALANTS ...............................................
45
Recommended Chemical Product and Sealant .......45
IDENTIFICATION INFORMATION ....................46
Model Variation ........................................................46
Identification Number ...............................................47
Dimensions ..............................................................48
Wheels & Tires ........................................................48
TERMINOLOGY ................................................50
SAE J1930 Terminology List ...................................50

GI-4
< SERVICE INFORMATION >
PRECAUTIONS
• Use hand tools, power tools (disassembly only) and recommended
special tools where specified for safe and efficient service repairs.
• When repairing the fuel, oil, water, vacuum or exhaust systems,
check all affected lines for leaks.
• Before servicing the vehicle:
Protect fenders, upholstery and carpeting with appropriate covers.
Take caution that keys, buckles or buttons do not scratch paint.
WARNING:
To prevent ECM from storing the diagnostic trouble codes, do not carelessly disconnect the harness
connectors which are related to the engine control system and TCM (transmission control module)
system. The connectors should be disconnected only when working according to the WORK FLOW of
TROUBLE DIAGNOSES in EC and AT sections.
Precaution for Three Way CatalystINFOID:0000000003531472
If a large amount of unburned fuel flows into the catalyst, the catalyst temperature will be excessively high. To
prevent this, follow the instructions.
• Use unleaded gasoline only. Leaded gasoline will seriously damage the three way catalyst.
• When checking for ignition spark or measuring engine compression, make tests quickly and only when nec-
essary.
• Do not run engine when the fuel tank level is low, otherwise the engine may misfire, causing damage to the
catalyst.
Do not place the vehicle on flammable material. Keep flammable material off the exhaust pipe and the three
way catalyst.
Precaution for Fuel (Unleaded Premium Gasoline Required)INFOID:0000000003531473
Use unleaded premium gasoline with an octane rating of at least 91 AKI (Anti-Knock Index) number (Research
octane number 96).
If unleaded premium gasoline is not available, unleaded regular gasoline with an octane rating of at least 87
AKI number (Research octane number 91) can be used, but only under the following precautions:
• have the fuel tank filled only partially with unleaded regular gasoline, and fill up with unleaded premium gas-
oline as soon as possible.
• avoid full throttle driving and abrupt acceleration.
However, for maximum vehicle performance, the use of unleaded premium gasoline is recommended.
CAUTION:
Do not use leaded gasoline. Using leaded gasoline will damage the three way catalyst. Do not use E-85
fuel (85% fuel ethanol, 15% unleaded gasoline) unless the vehicle is specifically designed for E-85 fuel
(i.e. Flexible Fuel Vehicle - FFV models). Using a fuel other than that specified could adversely affect
the emission control devices and systems, and could also affect the warranty coverage validity.
PBIC0190E
SGI234

SERVICE INFORMATION FOR ELECTRICAL INCIDENT
GI-25
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How to Perform Efficient Diagnosis for an Electrical IncidentINFOID:0000000003531488
WORK FLOW
INCIDENT SIMULATION TESTS
Introduction
Sometimes the symptom is not present when the vehicle is brought in for service. If possible, re-create the
conditions present at the time of the incident. Doing so may help avoid a No Trouble Found Diagnosis. The fol-
lowing section illustrates ways to simulate the conditions/environment under which the owner experiences an
electrical incident.
The section is broken into the six following topics:
• Vehicle vibration
• Heat sensitive
• Freezing
• Water intrusion
• Electrical load
SGI838
STEP DESCRIPTION
STEP 1Get detailed information about the conditions and the environment when the incident occurred.
The following are key pieces of information required to make a good analysis:
WHATVehicle Model, Engine, Transmission/Transaxle and the System (i.e. Radio).
WHENDate, Time of Day, Weather Conditions, Frequency.
WHERERoad Conditions, Altitude and Traffic Situation.
HOWSystem Symptoms, Operating Conditions (Other Components Interaction).
Service History and if any After Market Accessories have been installed.
STEP 2Operate the system, road test if necessary.
Verify the parameter of the incident.
If the problem cannot be duplicated, refer to “Incident Simulation Tests”.
STEP 3Get the proper diagnosis materials together including:
• Power Supply Routing
• System Operation Descriptions
• Applicable Service Manual Sections
• Check for any Service Bulletins
Identify where to begin diagnosis based upon your knowledge of the system operation and the customer comments.
STEP 4Inspect the system for mechanical binding, loose connectors or wiring damage.
Determine which circuits and components are involved and diagnose using the Power Supply Routing and Harness Lay-
outs.
STEP 5 Repair or replace the incident circuit or component.
STEP 6Operate the system in all modes. Verify the system works properly under all conditions. Make sure you have not inad-
vertently created a new incident during your diagnosis or repair steps.

GI-26
< SERVICE INFORMATION >
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
• Cold or hot start up
Get a thorough description of the incident from the customer. It is important for simulating the conditions of the
problem.
Vehicle Vibration
The problem may occur or become worse while driving on a rough road or when engine is vibrating (idle with
A/C on). In such a case, you will want to check for a vibration related condition. Refer to the following illustra-
tion.
CONNECTORS & HARNESS
Determine which connectors and wiring harness would affect the electrical system you are inspecting. Gently
shake each connector and harness while monitoring the system for the incident you are trying to duplicate.
This test may indicate a loose or poor electrical connection.
HINT
Connectors can be exposed to moisture. It is possible to get a thin film of corrosion on the connector termi-
nals. A visual inspection may not reveal this without disconnecting the connector. If the problem occurs inter-
mittently, perhaps the problem is caused by corrosion. It is a good idea to disconnect, inspect and clean the
terminals on related connectors in the system.
SENSORS & RELAYS
Gently apply a slight vibration to sensors and relays in the system you are inspecting.
This test may indicate a loose or poorly mounted sensor or relay.
ENGINE COMPARTMENT
There are several reasons a vehicle or engine vibration could cause an electrical complaint. Some of the
things to check for are:
• Connectors not fully seated.
• Wiring harness not long enough and is being stressed due to engine vibrations or rocking.
• Wires laying across brackets or moving components.
• Loose, dirty or corroded ground wires.
• Wires routed too close to hot components.
To inspect components under the hood, start by verifying the integrity of ground connections. (Refer to Ground
Inspection described later.) First check that the system is properly grounded. Then check for loose connection
by gently shaking the wiring or components as previously explained. Using the wiring diagrams inspect the
wiring for continuity.
BEHIND THE INSTRUMENT PANEL
An improperly routed or improperly clamped harness can become pinched during accessory installation. Vehi-
cle vibration can aggravate a harness which is routed along a bracket or near a screw.
UNDER SEATING AREAS
An unclamped or loose harness can cause wiring to be pinched by seat components (such as slide guides)
during vehicle vibration. If the wiring runs under seating areas, inspect wire routing for possible damage or
pinching.
Heat Sensitive
SGI839

CONSULT-II CHECKING SYSTEM
GI-35
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PCONSULT-II CHECKING SYSTEM
DescriptionINFOID:0000000003531490
• CONSULT-II is a hand-held type tester. When it is connected with a diagnostic connector equipped on the
vehicle side, it will communicate with the control unit equipped in the vehicle and then enable various kinds
of diagnostic tests.
• Refer to “CONSULT-II Software Operation Manual” for more information.
Function and System ApplicationINFOID:0000000003531491
x: Applicable.
*1: If equipped.Diagnostic test mode Function
ENGINE
A/T
ICC
*1
ABS
AIR BAG
IPDM E/R
BCM
AUTO DRIVE POS.
REARVIEW CAMERA
AIR LEVELIZER
ALL MODE AWD/4WD
HVAC
NVIS (NATS)
*2
NVIS (NATS BCM OR S/ENT)
*2
Work supportThis mode enables a technician to adjust some devices
faster and more accurately by following the indications on
CONSULT-II.xxxx - - xxxxx - - -
Self-diagnostic Self-diagnostic can be performed quickly. ----x---------
Self-diagnostic results Self-diagnostic results can be read and erased quickly. xxxx - xxx - xxxxx
Trouble diagnostic
recordCurrent self-diagnostic results and all trouble diagnostic
records previously stored can be read.--- - x---------
Data monitor Input/Output data in the ECM can be read. xxxx - x - xxxxx - -
Data monitor (spec) Data monitor specification can be read. x-------------
CAN diagnosis support
monitorThe communication condition of CAN communication line
can be read.xxxx - xxx - - xx - -
Active testDiagnostic Test Mode in which CONSULT-II drives some
actuators apart from the ECMs and also shifts some param-
eters in a specified range.x-xx-x-x-x----
Function testThis mode can show results of self-diagnosis of ECU with
either “OK” or “NG”. For engines, more practical tests re-
garding sensors/switches and/or actuators are available.xx-xx- --- -----
DTC & SRT confirma-
tionThe results of SRT (System Readiness Test) and the self-
diagnosis status/result can be confirmed.x-------------
DTC work supportThe operating condition to confirm Diagnosis Trouble
Codes can be selected.xx------------
ECM/ECU part number ECM/ECU part number can be read.
xxxx - -xx
xxxx - -
ECU discriminated No.Classification number of a replacement ECU can be read to
prevent an incorrect ECU from being installed.----x---------
Passenger Airbag Displays the STATUS (readiness) of the front passenger air
bag.----x---------
Configuration Sets control module parameters to match vehicle options. ------x-------
PIN read
*3This mode shows the BCM-specific 5-digit code. -------------x
Control unit
initialization
*3All registered ignition key IDs in NATS components can be
initialized and new IDs can be registered.------------x-

CONSULT-II CHECKING SYSTEM
GI-37
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2. If necessary, turn on the ignition switch.
3. Touch “START (NISSAN BASED VHCL)” or system shortcut (eg:
ENGINE) on the screen.
4. Touch necessary system on "SELECT SYSTEM" screen.
If necessary system is not indicated, check power supply and
ground of system control unit. If it is normal, refer to GI-38,
"CONSULT-II Data Link Connector (DLC) Circuit".
5. Select the desired part to be diagnosed on the "SELECT DIAG
MODE" screen.
BCIA0029E
BCIA0030E
BCIA0031E

IDENTIFICATION INFORMATION
GI-47
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Identification NumberINFOID:0000000003531504
VEHICLE IDENTIFICATION NUMBER ARRANGEMENT
1. Emission control information label 2. Tire placard 3. F.M.V.S.S. certification label
4. Vehicle identification number plate 5. Vacuum hose diagram
WAIA0053E
Position Character Qualifier Definition
1
5N3 Manufacturer 5N3: USA produced multi-purpose vehicle 2
3
4 A Engine type A: VK56DE
5 A Vehicle line A: Infiniti QX56
6 0 Model change (0-9)
7 8 Body type 8: 4 door wagon
8AGross vehicle
weight ratingA: 2WD, 4-wheel ABS, Class E
B: 4WD, 4-wheel ABS, Class E
9 * Check digit(0 to 9 or X) The code for the check digit is determined by a mathematical com-
putation.
10 7 Model year 2007
11 NManufacturing
plantN: Canton Mississippi
12
XXXXXVehicle serial num-
berChassis number 13
14
15
16
17