2011 INFINITI QX56 check engine

PRECAUTIONSGI-29
< PRECAUTION >
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 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 trou ble codes, never carelessly disconnect the harness
connectors which are related to the engine cont rol 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 TM sections.
Three Way CatalystINFOID:0000000006280871
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.
Multiport Fuel Inje ction System or Engine Control SystemINFOID:0000000006280872
 Before connecting or disconnecti ng any harness connector for the
multiport fuel injection system or ECM:
Turn ignition switch to “OFF” position.
Disconnect negative battery terminal.
Otherwise, there may be damage to ECM.
 Before disconnecting pressurized fuel line from fuel pump to injec- tors, be sure to release fuel pressure.
 Be careful not to jar components such as ECM and mass air flow sensor.
HosesINFOID:0000000006280873
HOSE REMOVAL AND INSTALLATION
 To prevent damage to rubber hose, do not pry off rubber hose withtapered tool or screwdriver.
SGI234
SGI787
SMA019D
Revision: 2010 May2011 QX56

GI-30
< PRECAUTION >
PRECAUTIONS
 To reinstall the rubber hose securely, check that hose insertionlength and orientation is correct. (If tube is equipped with hose
stopper, insert rubber hose into tube until it butts up against hose
stopper.)
HOSE CLAMPING
 If old rubber hose is re-used, install hose clamp in its original posi-tion (at the indentation where the old clamp was). If there is a trace
of tube bulging left on the old rubber hose, align rubber hose at
that position.
 Discard old clamps; replace with new ones.
 After installing plate clamps, apply force to them in the direction of the arrow, tightening rubber hose equally all around.
Engine OilsINFOID:0000000006280874
Prolonged and repeated contact with used engine oil may cause skin cancer. Try to avoid direct skin contact
with used oil.
If skin contact is made, wash thoroughly with soap or hand cleaner as soon as possible.
HEALTH PROTECTION PRECAUTIONS
 Avoid prolonged and repeated contact with oils, particularly used engine oils.
 Wear protective clothing, including impervious gloves where practicable.
 Do not put oily rags in pockets.
 Avoid contaminating clothes, pa rticularly underpants, with oil.
 Heavily soiled clothing and oil-impregnated footwear should not be worn. Overalls must be cleaned regu-
larly.
 First aid treatment should be obtained immediately for open cuts and wounds.
 Use barrier creams, applying them before each work period, to help the removal of oil from the skin.
 Wash with soap and water to ensure all oil is removed (skin cleansers and nail brushes will help). Prepara-
tions containing lanolin replace the natural skin oils which have been removed.
 Do not use gasoline, kerosene, diesel fuel, gas oil, thinners or solvents for cleaning skin.
 If skin disorders develop, obtain medical advice without delay.
 Where practical, degrease components prior to handling.
 Where there is a risk of eye contact, eye protection should be worn, for example, chemical goggles or face
shields; in addition an eye wash facility should be provided.
ENVIRONMENTAL PROTECTION PRECAUTIONS
SMA020D
SMA021D
SMA022D
Revision: 2010 May2011 QX56

GI-36
< BASIC INSPECTION >
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
BASIC INSPECTION
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
Work FlowINFOID:0000000006280851
WORK FLOW
Control Units and Electrical PartsINFOID:0000000006280852
PRECAUTIONS
 Never reverse polarity of battery terminals.
 Install only parts specified for a vehicle.
 Before replacing the control unit, check the i nput and output and functions of the component parts.
 Do not apply excessive force when disconnecting a connector.
SGI838
STEP DESCRIPTION
STEP 1 Get 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:
WHAT
Vehicle Model, Engine, Transmission/Transaxle and the System (i.e. Radio).
WHEN Date, Time of Day, Weather Conditions, Frequency.
WHERE Road Conditions, Altitude and Traffic Situation.
HOW System Symptoms, Operating Conditions
(Other Components Interaction).
Service History and if any After Market Accessories have been installed.
STEP 2 Operate the system, road test if necessary.
Verify the parameter of the incident.
If the problem cannot be duplicated, refer to “Incident Simulation Tests”.
STEP 3 Get 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 4 Inspect 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 6 Operate the system in all modes. Verify the system works properly under all conditions. check you have not inadvertently
created a new incident during your diagnosis or repair steps.
Revision: 2010 May2011 QX56

SERVICE INFORMATION FOR ELECTRICAL INCIDENTGI-41
< BASIC INSPECTION >
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lowing section illustrates ways to simulate the c onditions/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
 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.
Connector & Harness
Determine which connectors and wiring harness would affect the electrical system you are inspecting. Gently
shake each connector and harness while monitoring the syst em 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 corrosi on. It is a good idea to disconnect, inspect and clean the
terminals on related connectors in the system.
Sensor & Relay
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 verifyi ng the integrity of ground connections. (Refer to Ground
Inspection described later.) First check that the syst em is properly grounded. Then check for loose connection
by gently shaking the wiring or components as previous ly 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
SGI839
Revision: 2010 May2011 QX56

GI-48
< BASIC INSPECTION >
CONSULT-III/GST CHECKING SYSTEM
CONSULT-III/GST CHECKING SYSTEM
DescriptionINFOID:0000000006280856
 When CONSULT-III/GST is connected with a data link connector
(A) equipped on the vehicle side, it will communicate with the con-
trol unit equipped in the vehicle and then enable various kinds of
diagnostic tests.
 Refer to “CONSULT-III Software Operation Manual” for more infor- mation.
CONSULT-III Function a nd System Application*1INFOID:0000000006280857
1 : Instrument lower panel LH
JPAIA0769ZZ
Diagnostic test
mode Function
ENGINE
TRANSMISSION AIR BAG
METER/M&A
AUTO BACK DOOR BCM
AUTO DRIVE POS. ABS
IPDM E/R
ALL MODE AWD/4WD MULTI AV
ICC/ADAS SONAR
AIR PRESSURE MONITOR AFS (ADAPTIVE LIGHT)
PRECRASH SEAT BELT HVAC
LASER
LANE CAMERA
ACCELE PEDAL ACT
E–SUS
SIDE RADAR LEFT
SIDE RADAR RIGHT CAN GATEWAY
Work Support This mode
enables a
technician to
adjust some
devices fast-
er and more
accurately.xx - - - xxx - xxxxxx - xxx - xxx -
Self Diagnostic
Results Retrieve DTC
from ECU
and display
diagnostic
items.
xxxxxxxxxxxxxxxxxxxxxxxx
Data Monitor Monitor the
input/output
signal of the
control unit in
real time.xx - xxxxxxxxxxxxxxxxxxxx -
CAN Diagnosis This mode
displays a
network diag-
nosis result
about CAN
by a diagram.xxxxxxxxxxxx -xxxxxxxxxxx
CAN Diagnosis
Support Moni-
tor It monitors
the status of
CAN commu-
nication.
xx - xxxxxxxxx -xxxxxxxxxxx
Revision: 2010 May2011 QX56

CONSULT-III/GST CHECKING SYSTEMGI-49
< BASIC INSPECTION >
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x: Applicable
*1: If GST application is equipped , functions in accordance with SAE J1 979 and ISO 15031-5 can be used.
Active Test
Send the
drive signal
from CON-
SULT-III to
the actuator.
The opera-
tion check
can be per-
formed.x - - - - xxxx - - xxxx - x - - xxxx -
DTC & SRT
confirmation The status of
system moni-
toring tests
and the self-
diagnosis
status/result
can be con-
firmed.
xx----------------------
ECU Identifica-
tion Display the
ECU identifi-
cation num-
ber (part
number etc.)
of the select-
ed system.
xxx - xxxxxxxxxxxxxxxxxxxx
Function Test This mode
can show re-
sults of self-
diagnosis of
ECU with ei-
ther “OK” or
“NG”. For en-
gine, more
practical
tests regard-
ing sensors/
switches and/
or actuators
are available.xxx----x----------------
Configuration Function to
READ/
WRITE vehi-
cle configura-
tion.-----x----x------------x
Special
Function Other results
or histories,
etc. that are
recorded in
ECU are dis-
played.
-xxx--------------------
Diagnostic test
mode Function
ENGINE
TRANSMISSION AIR BAG
METER/M&A
AUTO BACK DOOR
BCM
AUTO DRIVE POS. ABS
IPDM E/R
ALL MODE AWD/4WD
MULTI AV
ICC/ADAS SONAR
AIR PRESSURE MONITOR AFS (ADAPTIVE LIGHT)
PRECRASH SEAT BELT HVAC
LASER
LANE CAMERA
ACCELE PEDAL ACT E–SUS
SIDE RADAR LEFT
SIDE RADAR RIGHT CAN GATEWAY
Revision: 2010 May2011 QX56

GW-6
< SYMPTOM DIAGNOSIS >
SQUEAK AND RATTLE TROUBLE DIAGNOSES
If possible, drive the vehicle with the customer until the noise is duplicated. Note any additional information on
the Diagnostic Worksheet regarding the conditions or lo cation of the noise. This information can be used to
duplicate the same conditions when you confirm the repair.
If the noise can be duplicated easily during the test drive, to help identify the source of the noise, try to dupli-
cate the noise with the vehicle stopped by doing one or all of the following:
1) Close a door.
2) Tap or push/pull around the area where the noise appears to be coming from.
3) Rev the engine.
4) Use a floor jack to recreate vehicle “twist”.
5) At idle, apply engine load (electrical load, half-cl utch on M/T models, drive position on A/T models).
6) Raise the vehicle on a hoist and hit a tire with a rubber hammer.
 Drive the vehicle and attempt to duplicate the conditions the customer states exist when the noise occurs.
 If it is difficult to duplicate the noise, drive the v ehicle slowly on an undulating or rough road to stress the
vehicle body.
CHECK RELATED SERVICE BULLETINS
After verifying the customer concern or symptom, chec k ASIST for Technical Service Bulletins (TSBs) related
to that concern or symptom.
If a TSB relates to the symptom, follo w the procedure to repair the noise.
LOCATE THE NOISE AND IDENTIFY THE ROOT CAUSE
1. Narrow down the noise to a general area. To help pi npoint the source of the noise, use a listening tool
(Chassis Ear: J-39570, Engine Ear and mechanics stethoscope).
2. Narrow down the noise to a more specific area and identify the cause of the noise by:
 Removing the components in the area that you suspect the noise is coming from.
Do not use too much force when removing clips and fasteners, otherwise clips and fastener can be broken
or lost during the repair, resulting in the creation of new noise.
 Tapping or pushing/pulling the component that you suspect is causing the noise.
Do not tap or push/pull the component with excessive force, otherwise the noise will be eliminated only tem-
porarily.
 Feeling for a vibration with your hand by touching the component(s) that you suspect is (are) causing the
noise.
 Placing a piece of paper between components that you suspect are causing the noise.
 Looking for loose components and contact marks. Refer to GW-7, "
Inspection Procedure".
REPAIR THE CAUSE
 If the cause is a loose component, tighten the component securely.
 If the cause is insufficient clearance between components:
- Separate components by repositioning or loos ening and retightening the component, if possible.
- Insulate components with a suitable insulator such as urethane pads, foam blocks, felt cloth tape or ure-
thane tape. A Nissan Squeak and Rattle Kit (J-43980) is available through your authorized Nissan Parts
Department.
CAUTION:
Do not use excessive force as many components are constructed of plastic and may be damaged.
NOTE:
Always check with the Parts Departm ent for the latest parts information.
The following materials are contained in the Nissan Squeak and Rattle Kit (J-43980). Each item can be
ordered separately as needed.
URETHANE PADS [1.5 mm (0.059 in) thick]
Insulates connectors, harness, etc.
76268-9E005: 100 ×135 mm (3.94 ×5.31 in)/76884-71L01: 60 ×85 mm (2.36 ×3.35 in)/76884-
71L02:15 ×25 mm (0.59 ×0.98 in)
INSULATOR (Foam blocks)
Insulates components from contact. Can be used to fill space behind a panel.
73982-9E000: 45 mm (1.77 in) thick, 50 ×50 mm (1.97 ×1.97 in)/73982-
50Y00: 10 mm (0.39 in) thick, 50 ×50 mm (1.97 ×1.97 in)
INSULATOR (Light foam block)
80845-71L00: 30 mm (1.18 in) thick, 30 ×50 mm (1.18 ×1.97in)
FELT CLOTHTAPE
Used to insulate where movement does not occu r. Ideal for instrument panel applications.
Revision: 2010 May2011 QX56

HA-6
< PRECAUTION >
PRECAUTIONS
 Turn the compressor shaft by hand more than five turns in both directions after compressor service
operation. This distributes equall y lubricant inside the compressor. Let the engine idle and operate
the compressor for one hour after the compressor is installed.
 Apply voltage to the new one and check for norma l operation after replacing the compressor magnet
clutch.
LEAK DETECTION DYE
CAUTION:
 The A/C system contains a fluorescent leak detect ion dye used for locating refrigerant leakages. An
ultraviolet (UV) lamp is required to il luminate the dye when inspecting for leakages.
 Wear always fluorescence enhancing UV safety goggles to protect eyes and enhance the visibility of
the fluorescent dye.
 The fluorescent dye leak detector is not a replacem ent for an electrical leak detector. The fluorescent
dye leak detector should be used in conjunction with an electrical leak detector to pin-point refriger-
ant leakages.
 Read and follow all manufacture’ s operating instructions and precau tions prior to performing the
work for the purpose of safet y and customer’s satisfaction.
 A compressor shaft seal should not necessarily be repaired because of dye seepage. The compres-
sor shaft seal should only be repaired after conf irming the leakage with an electrical leak detector.
 Remove always any remaining dye from the leakage area after repairs are completed to avoid a mis-
diagnosis during a future service.
 Never allow dye to come into contact with painted body panels or interior components. Clean imme-
diately with the approved dye cl eaner if dye is spilled. Fluorescent dye left on a surface for an
extended period of time cannot be removed.
 Never spray the fluorescent dye cleaning agent on hot surfaces (eng ine exhaust manifold, etc.).
 Never use more than one refrigerant dye bottle [1/4 ounce (7.4 cc)] per A/C system.
 Leak detection dyes for HFC-134a (R-134a) and CFC- 12 (R-12) A/C systems are different. Never use
HFC-134a (R-134a) leak detection dye in CFC-12 (R- 12) A/C system, or CFC-12 (R-12) leak detection
dye in HFC-134a (R-134a) A/C system, or A/C system damage may result.
 The fluorescent properties of the dye remains fo r three or more years unless a compressor malfunc-
tion occurs.
NOTE:
Identification
 Vehicles with factory installed fluorescent dye have a green label.
 Vehicles without factory installed fluorescent dye have a blue label.
Service EquipmentINFOID:0000000006276140
RECOVERY/RECYCLING RECHARGING EQUIPMENT
Be certain to follow the manufacturer’s instructions for machine operation and machine maintenance. Never
introduce any refrigerant other than that specified into the machine.
ELECTRICAL LEAK DETECTOR
Be certain to follow the manufacturer’s instruct ions for tester operation and tester maintenance.
VACUUM PUMP
Revision: 2010 May2011 QX56