fuel pressure INFINITI QX56 2006 Factory Owners Manual

IDX-4
ALPHABETICAL INDEX
E
ECM input/output signal ..................... EC-105
, EC-129
ECM power supply ............................. EC-145, EC-453
ECM relay ........................................................ EC-145
ECM/PW - Wiring diagram ............................... EC-454
ECTS - Wiring diagram .................................... EC-194
Electric sunroof .................................................. RF-10
Electric throttle control actuator ......... EC-534, EC-545
Electrical load signal circuit .............................. EC-596
Electrical units location ...................................... PG-65
Electronic ignition (EI) system ........................... EC-26
Engine control circuit diagram ......................... EC-103
Engine control component parts location ........... EC-96
Engine control module (ECM) .......................... EC-457
Engine control system diagram ......................... EC-23
Engine coolant .................................................. CO-10
Engine coolant temperature sensor (ECTS) ... EC-192,
EC-205
Engine fail-safe system ...................................... EC-91
Engine oil ............................................................. LU-7
Engine oil filter replacement ............................. MA-17
Engine oil precautions .......................................... GI-7
Engine oil replacement ..................................... MA-17
Engine removal ................................................. EM-74
Engine room cover ............................................ EM-12
Engine serial number .......................................... GI-49
ETC1 - Wiring diagram .................................... EC-535
ETC2 - Wiring diagram .................................... EC-530
ETC3 - Wiring diagram .................................... EC-541
EVAP canister .................................................... EC-35
EVAP canister purge volume control solenoid valve ....
EC-373
, EC-381
EVAP canister vent control valve ....... EC-388, EC-395
EVAP control system (small leak) diagnosis .. EC-365,
EC-419
, EC-427
EVAP control system pressure sensor .... EC-402, EC-
405, EC-411
EVAP control system purge flow monitoring diagnosis
EC-360
EVAP vapor lines inspection ............................. MA-20
Evaporative emission (EVAP) system ............... EC-32
Evaporator ..................................................... ATC-184
Exhaust manifold .............................................. EM-21
Exhaust system ................................................... EX-3
Exhaust system inspection .................................. EX-3
Expansion valve ............................................. ATC-186
F
F/FOG - Wiring diagram ..................................... LT-71
F/PUMP - Wiring diagram ................................ EC-605
Final drive pre-inspection ................................. FFD-15
Final drive removal and installation .. FFD-12, RFD-13
Flow charts ......................................................... GI-28
Fluid temperature sensor (A/T) ........................ AT-127
Fluids ................................................................ MA-11
Fluorescent leak detector .............................. ATC-187
Fog lamp, front .................................................... LT-69
Fog lamp, front, removal and installation ........... LT-79
Foot lamp ......................................................... LT-135
Freeze frame data ............................... EC-53, EC-118
Front brake solenoid valve ................. AT-143, AT-145
Front bumper ...................................................... EI-13
Front case (Transfer) .......................... TF-149, TF-176
Front combination lamp removal and installation LT-31
Front door ............................. BL-128, BL-131, GW-65
Front Door Trim ................................................... EI-32
Front drive shaft (Transfer) ................. TF-149, TF-176
Front fog lamp .................................................... LT-69
Front fog lamp removal and installation ............. LT-79
Front passenger air bag .................................. SRS-50
Front seat ........................................................... SE-91
Front seat belt ...................................................... SB-3
Front seat belt pre-tensioner ............... SRS-3, SRS-57
Front washer ...................................................... WW-4
Front wiper ......................................................... WW-4
FTS - Wiring diagram ....................................... AT-128
FTTS - Wiring diagram ...................... EC-311, EC-316
Fuel cut control (at no load high engine speed) EC-27
Fuel filter replacement ......................................... FL-6
Fuel gauge ............................................................ DI-5
Fuel injection system (Bank 1) .......... EC-288, EC-299
Fuel injection system (Bank 2) .......... EC-288, EC-299
Fuel injector .................................................... EC-598
Fuel injector and fuel tube ................................. EM-31
Fuel level sensor ................. EC-436, EC-438, EC-440
Fuel line inspection .............................................. FL-4
Fuel precautions ................................................... GI-5
Fuel pressure check .......................................... EC-80
Fuel pressure release ....................................... EC-80
Fuel pump ....................................................... EC-604
Fuel pump and gauge .......................................... FL-6
Fuel system .......................................................... FL-4
Fuel tank ............................................................ FL-10
Fuel tank temperature sensor ........... EC-309, EC-315
Fuel tank vacuum relief valve ........................... EC-35
FUELB1 - Wiring diagram ................. EC-290, EC-301
FUELB2 - Wiring diagram ................. EC-292, EC-303
Fuse ...................................................... PG-17, PG-77
Fuse and fusible link box .................................. PG-77
Fuse block ......................................................... PG-76
Fusible link ............................................ PG-17, PG-77
G
Garage jack and safety stand ............................. GI-41
Gauges ................................................................. DI-5
Generator .......................................................... SC-17
Generic scan tool (GST) ................................. EC-127
Glass ...................................... GW-11, GW-65, GW-68
Glove box lamp ................................................ LT-158
GPS antenna ..................................................... AV-85
Grease .............................................................. MA-11
Ground distribution ............................................ PG-31

IDX-6
ALPHABETICAL INDEX
Magnet clutch ............................... ATC-115, ATC-176
MAIN - Wiring diagram ...................... EC-145, AT-167
Main oil pump (Transfer) ..................... TF-154, TF-167
Mainshaft (Transfer) ........................... TF-154, TF-167
Maintenance (engine)Schedule 1 ....................... MA-7
Maintenance (engine)Schedule 2 ....................... MA-9
Major overhaul (Final drive) ............................. FFD-14
Major overhaul (Transfer) ................................ TF-146
Malfunction indicator lamp (MIL) ........................ EC-63
Map lamp .......................................................... LT-135
Mass air flow sensor (MAFS) ............. EC-171, EC-180
Meter ..................................................................... DI-5
METER - Wiring diagram .................................... DI-10
MIL data link connectors circuit ....................... EC-635
MIL/DL - Wiring diagram .................................. EC-635
MIRROR - Wiring diagram ................................ GW-93
Misfire .............................................................. EC-327
Mode door control linkage adjustment ............. ATC-66
Mode door motor ............................ ATC-64, ATC-161
Model variation ................................................... GI-47
Multiport fuel injection (MFI) system .................. EC-24
Multiport fuel injection precautions ....................... GI-6
Multi-remote control system - See Remote keyless entry
system ............................................................... BL-44
N
NATS - Wiring diagram .................................... BL-140
NAVI - Wiring diagram ....................................... AV-89
NAVI Control Unit .............................................. AV-86
Navigation system ............................................. AV-84
Neutral-4LO switch ............................................ TF-62
NONDTC - Wiring diagram .............................. AT-176
NVH troubleshooting (AX) ................................. FAX-4
NVH troubleshooting (EM) ................................ EM-10
NVH troubleshooting (Final drive) ..................... RFD-7
NVH troubleshooting (Propeller shaft) ................. PR-3
NVH troubleshooting (RAX) .............................. RAX-4
NVH troubleshooting (RSU) .............................. RSU-5
NVH troubleshooting (ST) .................................... PS-5
NVH troubleshooting (Transfer) ......................... TF-10
NVH troubleshooting (WT)NVH troubleshooting (WT) .
WT-4
NVIS (Nissan vehicle immobilizer system) precautions
GI-3
O
O2H2B1 - Wiring diagram ................................ EC-165
O2H2B2 - Wiring diagram ................................ EC-167
O2S2B1 - Wiring diagram ... EC-256, EC-267, EC-280
O2S2B2 - Wiring diagram ... EC-258, EC-269, EC-282
Oil cooler (engine) ............................................. LU-11
Oil filter ............................................................... LU-10
Oil filter (Transfer) ............................................ TF-143
Oil pan (engine) ................................................ EM-24
Oil pressure (engine) ........................................... LU-7
Oil pressure relief valve (engine) ......................... LU-5
Oil pump (engine) .............................................. LU-13
Oil seal replacement (engine) ........................... EM-60
Oil seal replacement (front of final drive) FFD-8, RFD-9
Oil seal replacement (side of final drive) ......... RFD-11
On board diagnostic system ............................. EC-48
ORVR (On-board Refueling Vapor Recovery) .. EC-39
Overheat ......................................................... EC-473
P
P/SCKT - Wiring diagram ................................. WW-53
Pantograph jack .................................................. GI-41
Park/Neutral position switch ............................ EC-465
Parking brake control ........................................... PB-4
PCV (positive crankcase ventilation) ................ EC-45
Periodic maintenance ......................................... MA-7
Personal lamp .................................................. LT-135
PGC/V - Wiring diagram ................... EC-375, EC-383
PHASE - Wiring diagram ................................ EC-349
PHONE - Wiring diagram ................................... AV-67
Pinion bearing preload diff. ............................. RFD-26
Piston pin inspection ......................................... EM-94
Piston ring inspection ........................................ EM-95
Piston to bore clearance ................................... EM-99
Planetary carrier (Transfer) ................. TF-149, TF-176
PNP/SW - Wiring diagram ... EC-467, AT-105, AT-106
POS - Wiring diagram ..................................... EC-342
POWER - Wiring diagram ................................... PG-6
Power door lock ................................................. BL-16
Power seat ......................................................... SE-83
Power steering fluid level .................................. MA-29
Power steering gear ........................................... PS-15
Power steering oil pump .................................... PS-21
Power steering pressure (PSP) sensor ........... EC-448
Power steering system bleeding .......................... PS-6
Power supply routing .......................................... PG-4
Power window .................................................. GW-15
PRE/SE - Wiring diagram ................. EC-407, EC-413
Precautions (General) ........................................... GI-4
Precautions in repairing high strength steel ..... BL-190
Pressure switch 1 ............................... AT-145, AT-159
Pressure switch 2 ............................................. AT-157
Pressure switch 3 ............................... AT-141, AT-161
Pressure switch 5 ............................... AT-149, AT-163
Pressure switch 6 ............................... AT-153, AT-165
Pressure test (A/T) ............................................. AT-52
Propeller shaft ........................................... PR-4, PR-8
Propeller shaft inspection .................................. MA-25
Propeller shaft on vehicle service ....................... PR-8
Propeller shaft vibration ............................ PR-4, PR-8
PS/SEN - Wiring diagram ............................... EC-449
R
R/VIEW - Wiring diagram .................................... DI-76
Radiator ............................................................ CO-14
Rear Audio Remote Control Unit ......................... AV-8
Rear axle ........................................................... RAX-5
Rear bumper ....................................................... EI-15
Rear case (Transfer) ........................... TF-148, TF-181

CAN COMMUNICATIONLAN-37
[CAN]
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Revision: November 2009 2006 QX56
Fuel level low warning signalT R
Fuel level sensor signal RT
Parking brake switch signal TR
Stop lamp switch signal RTR
Tow mode switch signal RT
Vehicle speed signal RR
RT
RRR R T RR
A/C switch/indicator signal TR
RT
A/C switch signal RTR
Blower fan motor switch signal RT
Day time running light request signal TR
Door switch signal R R R TR
Front fog light request signal TR
Front wiper request signal RT R
High beam request signal RT R
High beam status signal R T
Horn chirp signal TR
Ignition switch signal RT R
Key fob door unlock signal RT
Key fob ID signal RT
Key switch signal RT
Low beam request signal TR
Low beam status signal R T
Position light request signal RT R
Rear window defogger switch signal TR R
Sleep wake up signal R RT R
Theft warning horn request signal TR
Tire pressure data signal R T
Tire pressure signal RT
Turn indicator signal RT
Steering angle sensor signal TR
ABS malfunction signal RT
ABS warning lamp signal RT
Signals
ECM
TCM
ICC sensor
*1
ICC unit
*1
Driver seat control unit Combination meter
Display control unit BCM
Steering angle sensor Front air control
Transfer control unit
ABS actuator and electric unit (control unit) IPDM E/R

HEADLAMP (FOR USA)LT-29
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Aiming AdjustmentEKS00B89
For details, refer to the regulations in your area.
NOTE:
If vehicle front body has been repaired and /or the headlamp assembly has been replaced, check headlamp
aiming.
HEADLAMP AIMING
NOTE:

Before performing aiming adjustment, check the following:
–Confirm headlamp aiming switch is set to "0" (zero) position.
–Ensure all tires are inflated to correct pressure.
–Place vehicle and screen on level surface.
–Ensure there is no load in vehicle other than the driver (or equivalent weight placed in driver's position).
Coolant and engine oil filled to correct level, and fuel tank full.
–Confirm spare tire, jack and tools are properly stowed.
–Aim each headlamp individually and ensure other headlamp beam pattern is blocked from screen.
–Use adjusting screw to perform aiming adjustment
WKIA1859E

LT-78
FRONT FOG LAMP
Revision: November 20092006 QX56
Aiming AdjustmentEKS00B9M
The fog lamp is a semi-sealed beam type which uses a replaceable halogen bulb. Before performing aiming
adjustment, make sure of the following.

Keep all tires inflated to correct pressure.

Place vehicle on level ground.

See that vehicle is unloaded (except for full levels of coolant,
engine oil and fuel, and spare tire, jack, and tools). Have the
driver or equivalent weight placed in driver seat.
Adjust aiming in the vertical direction by turning the adjustment
screw.
NOTE:
Access adjustment screw from underneath front bumper. Turn screw
clockwise to raise pattern and counterclockwise to lower pattern.
1. Set the distance between the screen and the center of the fog lamp lens as shown.
2. Turn front fog lamps ON.
3. Adjust front fog lamps using adjusting screw so that the top edge of the high intensity zone is 200 mm (7.9 in) below the height of
the fog lamp centers as shown.

When performing adjustment, if necessary, cover the headlamps
and opposite fog lamp.
SEL350X
MEL327G
MEL328GA

MA-16
ENGINE MAINTENANCE
Revision: November 20092006 QX56
3. Run the engine until it reaches normal operating temperature.
4. Press the engine accelerator two or three times under no-load.
5. Stop the engine and wait until it cools down.
6. Drain the water from the engine cooling system. Refer to MA-13, "
DRAINING ENGINE COOLANT" .
7. Repeat steps 2 through 6 until clear water begins to drain from the radiator.
Checking Fuel LinesELS001PI
Inspect the fuel lines and fuel tank for improper mounting, leaks,
cracks, damage, loose connections, chafing, or deterioration.
As necessary, repair or replace any faulty parts.
Changing Fuel FilterELS001PJ
The fuel filter is part of the fuel level sensor unit, fuel filter and fuel pump assembly. Refer to FL-6, "FUEL
LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .
WARNING:
Before replacing the fuel filter, release the fuel pressure from the fuel system. Refer to EC-80, "
FUEL
PRESSURE RELEASE" .
Changing Engine Air Cleaner FilterELS001PK
VISCOUS PAPER TYPE
NOTE:

The viscous paper type filter does not need cleaning between replacement intervals.

Replace the air filter as necessary for required maintenance.
1. Remove the air duct and resonator assembly.
2. Disconnect the harness connector, then remove the air cleaner case (upper).
3. Remove the air cleaner filter from the air cleaner case (lower).
4. Install the new air cleaner filter in the air cleaner case (lower).
SMA803A
1. Air cleaner case (upper) 2. Air cleaner filter3. Air cleaner case (lower)
4. Air duct and resonator assembly
WBIA0465E

HARNESSPG-63
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HORNWW Horn
HSEAT SE Heated Seat
ICC ACS Intelligent Cruise Control
ICCBOF EC ICC Brake Switch
ICC/BS EC ICC Steering Switch
ICC/SW EC ICC Brake Switch
I/MIRR GW Inside Mirror (Auto Anti-Dazzling Mirror)
IATS EC Intake Air Temperature Sensor
IGNSYS EC Ignition System
ILL LT Illumination
INJECT EC Injector
INT/L LT Room/Map, Vanity, Cargo, Personal, Foot, Step, and Puddle Lamps
KEYLES BL Remote Keyless Entry System
KS EC Knock Sensor
MAFS EC Mass Air Flow Sensor
MAIN EC Main Power Supply and Ground Circuit
METER DI Speedometer, Tachometer, Temp. and Fuel Gauges
MIL/DL EC Malfunction Indicator Lamp
MIRROR GW Door Mirror
NATS BL Nissan Anti-Theft System
NAVI AV Navigation System
O2H2B1 EC Rear Heated Oxygen Sensor 2 Heater Bank 1
O2H2B2 EC Rear Heated Oxygen Sensor 2 Heater Bank 2
O2S2B1 EC Heated Oxygen Sensor 2 Bank 1
O2S2B2 EC Heated Oxygen Sensor 2 Bank 2
P/SCKT WW Power Socket
PGC/V EC EVAP Canister Purge Volume Control Solenoid Valve
PHASE EC Camshaft Position Sensor (PHASE) (Bank 1)
PNP/SW EC Park/Neutral Position Switch
POS EC Crankshaft Position Sensor (POS)
POWER PG Power Supply Routing
PRE/SE EC EVAP Control System Pressure Sensor
PS/SEN EC Power Steering Pressure Sensor
R/VIEW DI Rear View Monitor
RP/SEN EC Refrigerant Pressure Sensor
SEN/PW EC Sensor Power Supply
SHIFT AT A/T Shift Lock System
SONAR DI Rear Sonar System
SROOF RF Sunroof
SRS SRS Supplemental Restraint System
START SC Starting System
STOP/L LT Stop Lamp
T/TOW LT Trailer Tow
T/WARN WT Low Tire Pressure Warning System
TAIL/L LT Parking, License and Tail Lamps
T/F TFTransfer Case
TPS1 EC Throttle Position Sensor
TPS2 EC Throttle Position Sensor
TPS3 EC Throttle Position Sensor
TRNSCV BL HOMELINK® Universal Transceiver
TURN LT Turn Signal and Hazard Warning Lamps
VDC BRC Vehicle Dynamic Control System

RSU-28
REAR SUSPENSION ASSEMBLY
Revision: November 20092006 QX56
Wheel Alignment InspectionEES001HH
Rear Wheel Alignment Adjusting Bolts
PRELIMINARY INSPECTION
WARNING:
Always adjust the alignment with the vehicle on a flat surface. Use CONSULT-II “EXHAUST SOLE-
NOID” active test to release the air pressure from the rear load leveling air suspension system.
NOTE:
If alignment is out of specification, inspect and replace any damaged or worn rear suspension parts before
making any adjustments.
1. Check and adjust the wheel alignment with the vehicle under unladen conditions. “Unladen conditions”
means that the fuel, coolant, and lubricant are full; and that the spare tire, jack, hand tools and mats are in
their designated positions.
2. Check the tires for incorrect air pressure and excessive wear.
3. Check the wheels for runout and damage. Refer to WT-5, "
Inspection" .
4. Check the wheel bearing axial end play.
5. Check the shock absorbers. Refer to RSU-27, "
SHOCK ABSORBER INSPECTION" .
6. Check each mounting point of the suspension components for any excessive looseness or damage.
7. Check each link, arm, and the rear suspension member for any damage.
8. Check the vehicle height. Refer to RSU-49, "
Wheelarch Height (Unladen*1 )" .

If vehicle height is not within ± 10 mm (0.39 in) of the specification, perform the control unit initialization
procedure. Refer to RSU-47, "
Initialization Procedure" .
GENERAL INFORMATION AND RECOMMENDATIONS
1. A Four-Wheel Thrust Alignment should be performed.

This type of alignment is recommended for any NISSAN vehicle.

The four-wheel “thrust” process helps ensure that the vehicle is properly aligned and the steering wheel
is centered.

The alignment machine itself should be capable of accepting any NISSAN vehicle.

The alignment machine should be checked to ensure that it is level.
2. Make sure the alignment machine is properly calibrated.

Your alignment machine should be regularly calibrated in order to give correct information.
WEIA0102E
1. Rear lower link adjusting bolt, LH 2. Front lower link adjusting bolt, LH 3. Front lower link adjusting bolt, RH
4. Rear lower link adjusting bolt, RH
Axial end play : 0 mm (0 in)

SC-14
STARTING SYSTEM
Revision: November 20092006 QX56
DIAGNOSTIC PROCEDURE 1
Check Starter Motor Circuit
1. CHECK POWER SUPPLY TO STARTER MOTOR
1. Remove the fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is released.
3. Turn the ignition switch OFF.
4. Check that the starter motor connector F27 connection is clean and tight.
5. Check voltage between starter motor connector F27 terminal 2 and ground using a digital circuit tester.
OK or NG
OK >> GO TO 2.
NG >> Check harness between the battery and the starter motor for open circuit.
2. CHECK VOLTAGE DROP ON STARTER MOTOR CIRCUIT
Check voltage between starter motor connector F27 terminal 2 and
battery positive terminal using a digital circuit tester.
OK or NG
OK >> GO TO 3.
NG >> Check harness between the battery and the starter motor for poor continuity.
3. CHECK VOLTAGE DROP ON STARTER MOTOR GROUND CIRCUIT
Check voltage between starter motor case and battery negative ter-
minal using a digital circuit tester.
OK or NG
OK >> Starter motor ground circuit is OK. Further inspection is necessary. Refer to SC-13, "
WORK FLOW" .
NG >> Check harness between the starter motor case and ground for poor continuity.
Battery voltage should
exist.
WKIA2105E
Ignition switch in
START.
: Less than 0.5V
WKIA2106E
Ignition switch in
START. : Less than 0.2V
WKIA3437E

STARTING SYSTEMSC-15
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Revision: November 2009 2006 QX56
DIAGNOSTIC PROCEDURE 2
Check Magnetic Switch Circuit
1. CHECK POWER SUPPLY FOR MAGNETIC SWITCH
1. Remove the fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is released.
3. Turn the ignition switch OFF.
4. Disconnect starter motor connector F28.
5. Check voltage between starter motor connector F28 terminal 1 and ground using a digital circuit tester.
OK or NG
OK >> GO TO 2.
NG >> Check the following.

40A fusible link (letter m , located in fuse and fusible
link box)

Ignition switch

Starter relay [within the intelligent power distribution module engine room (IPDM E/R)]

Harness for open or short
2. CHECK VOLTAGE DROP ON MAGNETIC SWITCH CIRCUIT
1. Turn the ignition switch OFF.
2. Connect starter motor connector F28.
3. Check voltage between starter motor connector F28 terminal 1 and battery positive terminal using a digital circuit tester.
OK or NG
OK >> Magnetic switch circuit is OK. Further inspection is nec- essary. Refer to SC-13, "
WORK FLOW" .
NG >> Check harness between the battery and the magnetic
switch for poor continuity.
Ignition switch in
START.
: Battery voltage
WKIA2108E
Ignition switch in
START. : Less than 1V
WKIA1792E