2011 INFINITI QX56 ESP

EXT-6
< SYMPTOM DIAGNOSIS >
SQUEAK AND RATTLE TROUBLE DIAGNOSES
SYMPTOM DIAGNOSIS
SQUEAK AND RATTLE TROUBLE DIAGNOSES
Work FlowINFOID:0000000006367800
CUSTOMER INTERVIEW
Interview the customer if possible, to determine the c onditions that exist when the noise occurs. Use the Diag-
nostic Worksheet during the interview to document the facts and conditions when the noise occurs and any
customer comments. Refer to EXT-10, "
Diagnostic Worksheet". This information is necessary to duplicate the
conditions that exist when the noise occurs.
 The customer may not be able to provide a detailed description or the location of the noise. Attempt to obtain
all the facts and conditions that exist w hen the noise occurs (or does not occur).
 If there is more than one noise in the vehicle, perform a diagnosis and repair the noise that the customer is
concerned about. This can be accomplished by per forming a test drive with the customer.
 After identifying the type of noise, isolate the noise in terms of its characteristics. The noise characteristics
are provided so that the customer, service advis er, and technician use the same language when describing
the noise.
 Squeak – (Like tennis shoes on a clean floor) Squeak characteristics include the light contact / fast movement / brought on by road conditions / hard sur-
faces = high-pitched noise / softer surfaces = low-pitched noises / edge to surface = chirping
 Creak – (Like walking on an old wooden floor) Creak characteristics include firm contact / slow movement/twisting with a rotational movement / pitch
dependent on materials / often brought on by activity.
 Rattle – (Like shaking a baby rattle) Rattle characteristics include fast repeated contact / vibr ation or similar movement / loose parts/missing clip
or fastener / incorrect clearance.
 Knock – (Like a knock on a door) Knock characteristics include hollow sounds / someti mes repeating / often brought on by driver action.
 Tick – (Like a clock second hand) Tick characteristics include gentle contacting of light materials / loose components / can be caused by driver
action or road conditions.
 Thump – (Heavy, muffled knock noise)
Thump characteristics include softer knock / dull sounds often brought on by activity.
 Buzz – (Like a bumblebee) Buzz characteristics include high frequency rattle / firm contact.
 Often the degree of acceptable noise level varies depending upon the person. A noise that a technician may
judge as acceptable may be very irritating to a customer.
 Weather conditions, especially humidity and temperat ure, may have a great effect on noise level.
DUPLICATE THE NOISE AND TEST DRIVE
SBT842
Revision: 2010 May2011 QX56

FL-6
< REMOVAL AND INSTALLATION >
FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY
7. Disconnect harness connector (1) and all the fuel tube.
Disconnect quick connector as follows: Hold the sides of connector, push in tabs and pull out fuel feed
tube.
 If quick connector sticks to tube of main fuel level sensor unit, push and pull quick connector several times until they start to
move. Then disconnect them by pulling.
CAUTION:
 Quick connector (1) can be disconnected when the tabs (F) are completely depressed. Never twist it more than
necessary.
 Never use any tools to di sconnected quick connector.
 Keep resin tube (C) away from heat. Be especially careful when welding near the resin tube.
 Prevent acid liquid such as battery electrolyte, etc. from
getting on resin tube.
 Never bend or twist resin tube during installation and dis- connection.
 Never remove the remaining retainer (2) on hard tube (or the equivalent) (A) except when resin tube or retainer is
replaced.
 When resin tube or hard tube (or the equivalent) is replaced, also replace retainer with new one.
2 : Fuel feed tube
3 : Quick connector
JSBIA0301ZZ
A: Pull
B : Push in tabs
JPBIA0134ZZ
B : Connection (Cross-section)
D : To under floor fuel line
E : To fuel tank
G : Disconnection
JPBIA0130ZZ
Revision: 2010 May2011 QX56

HOW TO READ WIRING DIAGRAMSGI-9
< HOW TO USE THIS MANUAL >
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O PHOW TO READ WIRING DIAGRAMS
Connector SymbolsINFOID:0000000006282193
Most of connector symbols in wiring diagrams are shown from the terminal side.
 Connector symbols shown from the terminal side are enclosed by a single line and followed by the direction mark.
 Connector symbols shown from the harness side are enclosed by
a double line and followed by the direction mark.
 Certain systems and components, especially those related to
OBD, may use a new style slide-locking type harness connector.
For description and how to disconnect, refer to PG section,
“Description”, “HARNESS CONNECTOR”.
 Male and female terminals Connector guides for male terminals are shown in black and
female terminals in white in wiring diagrams.
SAIA0257E
SGI363
Revision: 2010 May2011 QX56

ABBREVIATIONSGI-15
< HOW TO USE THIS MANUAL >
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ABBREVIATION DESCRIPTION E/T Exhaust temperature
EBD Electric brake force distribution EC Engine control
ECL Engine coolant level
ECM Engine control module ECT Engine coolant temperature
ECV Electrical control valve
EEPROM Electrically erasable programmable read only memory EFT Engine fuel temperature
EGR Exhaust gas recirculation
EGRT Exhaust gas recirculation temperature EGT Exhaust gas temperature
EOP Engine oil pressure EP Exhaust pressure
EPR Exhaust pressure regulator EPS Electronically controlled power steering
ESP Electronic stability program system
EVAP canister Evaporative emission canister EXC Exhaust control
ABBREVIATION DESCRIPTION FC Fan control
FCW Forward collision warning FIC Fuel injector controlFP Fuel pump
FR Front
FRP Fuel rail pressure FRT Fuel rail temperature
FTP Fuel tank pressure FTT Fuel tank temperature
ABBREVIATION DESCRIPTION GND GroundGPS Global positioning systemGST Generic scan tool
ABBREVIATION DESCRIPTION HBMC Hydraulic body-motion control systemHDD Hard disk drive
HO2S Heated oxygen sensor HOC Heated oxidation catalyst
Revision: 2010 May2011 QX56

GI-28
< PRECAUTION >
PRECAUTIONS
 Before jacking up the vehicle, apply wheel chocks or other tireblocks 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.
 Before starting repairs which do not require battery power: Turn off ignition switch.
Disconnect the negative battery terminal.
 If the battery terminals are disconnected, recorded memory of
radio and each control unit is erased.
 To prevent serious burns: Avoid contact with hot metal parts.
Do not remove the radiator cap when the engine is hot.
 Dispose of drained oil or the solvent used for cleaning parts in an appropriate manner.
 Do not attempt to top off the fuel tank after the fuel pump nozzle
shuts off automatically.
Continued refueling may cause fuel overflow, resulting in fuel spray
and possibly a fire.
 Clean all disassembled parts in the designated liquid or solvent prior to inspection or assembly.
 Replace oil seals, gaskets, packings, O-rings, locking washers,
cotter pins, self-locking nuts, etc. with new ones.
 Replace inner and outer races of tapered roller bearings and needle bearings as a set.
 Arrange the disassembled parts in accordance with their assembled locations and sequence.
 Do not touch the terminals of electrical com ponents which use microcomputers (such as ECM).
Static electricity may damage internal electronic components.
 After disconnecting vacuum or air hoses, atta ch a tag to indicate the proper connection.
 Use only the fluids and lubricants specified in this manual.
 Use approved bonding agent, sealants or their equivalents when required.
 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 leakage.
SGI231
SEF289H
SGI233
JPAIA0335ZZ
Revision: 2010 May2011 QX56

SQUEAK AND RATTLE TROUBLE DIAGNOSESGW-5
< SYMPTOM DIAGNOSIS >
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SYMPTOM DIAGNOSIS
SQUEAK AND RATTLE TROUBLE DIAGNOSES
Work FlowINFOID:0000000006108035
CUSTOMER INTERVIEW
Interview the customer if possible, to determine the conditions that exist when the noise occurs. Use the Diag-
nostic Worksheet during the interview to document t he facts and conditions when the noise occurs and any of
customer's comments; refer to GW-9, "
Diagnostic Worksheet". This information is necessary to duplicate the
conditions that exist when the noise occurs.
 The customer may not be able to provide a detailed description or the location of the noise. Attempt to obtain
all the facts and conditions that exist when the noise occurs (or does not occur).
 If there is more than one noise in the vehicle, perform a diagnosis and repair the noise that the customer is
concerned about. This can be accomplished by performing a cruise test on the vehicle with the customer.
 After identifying the type of noise, isolate the noise in terms of its characteristics. The noise characteristics
are provided so the customer, service adviser and technician are all speaking the same language when
defining the noise.
 Squeak – (Like tennis shoes on a clean floor) Squeak characteristics include the light contact/fast movement/brought on by road conditions/hard surfaces
= higher pitch noise/softer surfaces = lower pitch noises/edge to surface = chirping
 Creak – (Like walking on an old wooden floor) Creak characteristics include firm contact/slow mo vement/twisting with a rotational movement/pitch depen-
dent on materials/often brought on by activity.
 Rattle – (Like shaking a baby rattle) Rattle characteristics include the fast repeated contac t/vibration or similar movement/loose parts/missing
clip or fastener/incorrect clearance.
 Knock – (Like a knock on a door) Knock characteristics include hollow sounding/someti mes repeating/often brought on by driver action.
 Tick – (Like a clock second hand) Tick characteristics include gentle contacting of li ght materials/loose components/can be caused by driver
action or road conditions.
 Thump – (Heavy, muffled knock noise)
Thump characteristics include softer k nock/dead sound often brought on by activity.
 Buzz – (Like a bumblebee) Buzz characteristics include high frequency rattle/firm contact.
 Often the degree of acceptable noise level will vary depending up on the person. A noise that you may judge
as acceptable may be very irritating to the customer.
 Weather conditions, especially humidity and temperat ure, may have a great effect on noise level.
DUPLICATE THE NOISE AND TEST DRIVE
SBT842
Revision: 2010 May2011 QX56

FRONT AUTOMATIC AIR CONDITIONING SYSTEMHAC-133
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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SYMPTOM DIAGNOSIS
FRONT AUTOMATIC AIR CONDITIONING SYSTEM
Diagnosis Chart By SymptomINFOID:0000000006275980
NOTE:
Perform the self-diagnoses with CONSULT-III before per forming the symptom diagnosis. If DTC is detected,
perform the corresponding diagnosis.
Symptom Corresponding malfunction part Reference
 Front air conditioning system does not activate.
 Front air conditioning system cannot be con-
trolled.
 Operation status of front air conditioning system is
not indicated on front dis-
play. Fail-safe activates Multi AV system
AV- 1 9 9 , "
Symptom Table"
Fail-safe does not acti-
vate Power supply system of A/C auto
amp.
 A/C auto amp. HAC-110, "A/C AUTO AMP. : Diag-
nosis Procedure"
 Air outlet does not change (Except upper ventila-
tion).
 Front mode door motor does not operate normally.  Circuit between front mode door
motor and A/C auto amp.
 Front mode door motor control link-
age
 Front mode door motor
 A/C auto amp. HAC-112, "FRONT MODE DOOR
MOTOR : Diagnosis Procedure"
 Upper ventilator door does not change.
 Upper ventilator door motor does not operate nor-
mally.  Circuit between upper ventilator
door motor and A/C auto amp.
 Upper ventilator door motor installa- tion condition
 Upper ventilator door motor
 A/C auto amp. HAC-116, "UPPER VENTILATOR
DOOR MOTOR : Diagnosis Proce-
dure"
 Discharge air temperature of driver side does not
change.
 Front air mix door motor (driver side) does not op-
erate normally.  Circuit between front air mix door
motor (driver side ) and A/C auto
amp.
 Front air mix door motor (driver side)
installation condition
 Front air mix door motor (driver side)
 A/C auto amp. HAC-110, "FRONT AIR MIX DOOR
MOTOR (DRIVER SIDE) : Diagno-
sis Procedure"
 Discharge air temperature of passenger side does
not change.
 Front air mix door motor (passenger side) does not
operate normally.  Circuit between front air mix door
motor (passenger side) and A/C
auto amp.
 Front air mix door motor (passenger side) installation condition
 Front air mix door motor (passenger side)
 A/C auto amp. HAC-111, "FRONT AIR MIX DOOR
MOTOR (PASSENGER SIDE) : Di-
agnosis Procedure"
 Intake door does not change.
 Intake door motor does not operate normally.
 Circuit between intake door motor
and A/C auto amp.
 Intake door motor control linkage
 Intake door motor
 A/C auto amp. HAC-113, "INTAKE DOOR MOTOR
: Diagnosis Procedure"
All door motors do not operate normally.
 Each door motor power supply and
ground circuit
 A/C auto amp. HAC-118, "Diagnosis Procedure"
Front blower motor operation is malfunctioning.  Power supply system of front blower
motor
 Circuit between front blower motor and A/C auto amp..
 Front blower motor
 A/C auto amp. HAC-121, "Diagnosis Procedure"
Revision: 2010 May2011 QX56

HAC-134
< SYMPTOM DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
FRONT AUTOMATIC AIR CONDITIONING SYSTEM
Compressor does not operate. Circuit between magnet clutch and
IPDM E/R
 Magnet clutch
 IPDM E/R (A/C relay)
 Circuit between ECM and refriger- ant pressure sensor
 Refrigerant pressure sensor
 CAN communication circuit
 A/C auto amp. HAC-142, "Diagnosis Procedure"
 Insufficient cooling.
 No cool air comes out. (Air flow volume is normal.)
 Magnet clutch control system
 Drive belt slipping
 Refrigerant cycle
 Air leakage from each duct
 A/C auto amp. connection recogni-
tion signal circuit
 Temperature settin g trimmer (front)HAC-138, "FRONT AIR CONDI-
TIONER : Diagnosis Procedure"
 Insufficient heating.
 No warm air comes out. (Air flow volume is nor-
mal.)  Engine cooling system
 Heater hose
 Heater core
 Air leakage from each duct
 Temperature settin
g trimmer (front)HAC-140, "FRONT AIR CONDI-
TIONER : Diagnosis Procedure"
Noise is heard when front
air conditioning system op-
erates. During compressor
operation
Refrigerant cycle
HA-27, "
Symptom Table"
During front blower
motor operation Mixing any foreign object in front
blower motor
 Front blower motor fan breakage
 Front blower motor rotation inferiori- ty HAC-122, "Component Inspection
(Front Blower Motor)"
 Memory function does not operate.
 Setting temperature is not memorized.
 Battery power supply system of A/C
auto amp.
 A/C auto amp. HAC-110, "A/C AUTO AMP. : Diag-
nosis Procedure"
Symptom Corresponding malfunction part Reference
Revision: 2010 May2011 QX56