2011 INFINITI QX56 service indicator

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U1000 CAN COMM CIRCUIT ......................... ....91
Description .......................................................... ....91
DTC Logic ...............................................................91
Diagnosis Procedure ...............................................91
U1010 CONTROL UNIT (CAN) ..........................92
Description .......................................................... ....92
DTC Logic ...............................................................92
Diagnosis Procedure ...............................................92
POWER SUPPLY AND GROUND CIRCUIT ......93
Description .......................................................... ....93
Diagnosis Procedure ...............................................93
4WD WARNING LAMP ......................................97
Component Function Check ................................ ....97
Diagnosis Procedure ...............................................97
4WD INDICATOR LAMP ....................................98
Component Function Check ................................ ....98
Diagnosis Procedure ...............................................98
SYMPTOM DIAGNOSIS ..............................99
HEAVY TIGHT-CORNER BRAKING SYMP-
TOM OCCURS . .............................................. ....
99
Description .......................................................... ....99
Diagnosis Procedure ...............................................99
4WD MODE DOES NOT CHANGE ..................100
Description .......................................................... ..100
Diagnosis Procedure .............................................100
4WD MODE INDICATOR LAMP CONTINUES
BLINKING .........................................................
101
Description .......................................................... ..101
Diagnosis Procedure .............................................101
4WD WARNING LAMP BLINKS QUICKLY .....102
Description .......................................................... ..102
4WD WARNING LAMP BLINKS SLOWLY .....103
Description .......................................................... ..103
Diagnosis Procedure .............................................103
INFORMATION DISPLAY IS NOT DIS-
PLAYED ...........................................................
104
Description .......................................................... ..104
Diagnosis Procedure .............................................104
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ..........................
105
NVH Troubleshooting Chart ................................ ..105
PERIODIC MAINTENANCE .......................106
TRANSFER FLUID ......................................... ..106
Inspection ............................................................ ..106
Draining .................................................................106
Refilling .................................................................106
REMOVAL AND INSTALLATION .............107
TRANSFER CONTROL UNIT .........................107
Removal and Installation ..................................... ..107
4WD MODE SWITCH ......................................108
Removal and Installation .......................................108
FRONT OIL SEAL ...........................................109
Exploded View .......................................................109
Removal and Installation .......................................109
REAR OIL SEAL .............................................111
Exploded View .......................................................111
Removal and Installation .......................................111
Adjustment .............................................................112
TRANSFER CONTROL ACTUATOR .............114
Exploded View .......................................................114
Removal and Installation .......................................114
Inspection ..............................................................114
TRANSFER HI-LO POSITION SENSOR ........116
Exploded View .......................................................116
Removal and Installation .......................................116
Inspection ..............................................................116
TRANSFER ROTARY POSITION SENSOR ...117
Exploded View .......................................................117
Removal and Installation .......................................117
Inspection ..............................................................118
TRANSFER LOCK POSITION SENSOR ........119
Exploded View .......................................................119
Removal and Installation .......................................119
Inspection ..............................................................119
TRANSFER FLUID TEMPERATURE SEN-
SOR .................................................................
120
Exploded View .......................................................120
Removal and Installation .......................................120
Inspection ..............................................................120
UNIT REMOVAL AND INSTALLATION ....121
TRANSFER ASSEMBLY ................................121
Exploded View ..................................................... ..121
Removal and Installation .......................................121
INPUT OIL SEAL ............................................123
Exploded View .......................................................123
Removal and Installation .......................................123
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... ...........................................
124
SERVICE DATA AND SPECIFICATIONS
(SDS) ...............................................................
124
General Specifications ......................................... ..124
FRONT PROPELLER SHAFT: 2F P15
PREPARATION ........ .................................
125
PREPARATION ...............................................125
Revision: 2010 May2011 QX56

FRONT OIL SEALDLN-159
< REMOVAL AND INSTALLATION > [FRONT FINAL DRIVE: R180A]
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3. Apply anti-corrosion oil to the thread and seat of new drive pin- ion lock nut, and temporarily tighten drive pinion lock nut to drive
pinion, using flange wrench (commercial service tool).
CAUTION:
Never reuse drive pinion lock nut.
4. Tighten drive pinion lock nut within the limits of specified torque so as to keep the pinion bearing preload within a standard val-
ues, using preload gauge (A) [SST: ST3127S000 (J-25765-A)].
CAUTION:
 Adjust to the lower limit of the drive pinion lock nut tight-
ening torque first.
 If the preload torque exceeds the specified value, replace collapsible spacer and tighte n it again to adjust. Never
loosen drive pinion lock nut to adjust the preload torque.
5. Fit a dial indicator onto the companion flange face (inner side of the propeller shaft mounting bolt holes).
6. Rotate the companion flange to check for runout.
7. Fit a test indicator to the inner side of the companion flange (socket diameter).
8. Rotate the companion flange to check for runout.
9. If the runout value is outside the repair limit, follow the procedure below to adjust.
a. Check for runout while changing the phase between companion flange and drive pinion gear by 90 ° step,
and search for the position where the runout is the minimum.
b. If the runout value is still outside of the limit after the phase has been changed, possible causes are be an
assembly malfunction of drive pinion and pinion bear ing and malfunction of pinion bearing. Check for
these items and repair if necessary.
c. If the runout value is still outsi de of the limit after the check and repair, replace companion flange.
10. Install front propeller shaft. Refer to DLN-129, "
Removal and Installation".
11. Install drive shaft. Refer to FAX-22, "
Removal and Installation".
12. Refill gear oil to the final drive and check oil level. Refer to DLN-155, "
Refilling".
13. Check the final drive for oil leakage. Refer to DLN-155, "
Inspection".
Total preload torque: A value
that add 0.1 – 0.4 N·m
(0.01 – 0.04 kg-m, 1 – 3 in-lb) to
the measured value when re-
moving.
PDIA1003E
Companion flange runout : Refer to DLN-185, "Com-
panion Flange Runout".
Companion flange runout : Refer to DLN-185, "
Com-
panion Flange Runout".
JSDIA0116ZZ
Revision: 2010 May2011 QX56

FRONT OIL SEALDLN-197
< REMOVAL AND INSTALLATION > [REAR FINAL DRIVE: R230]
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1. Apply multi-purpose grease to the lips of the new front oil seal.
Then drive the new front oil seal in evenly until it becomes flush
with the gear carrier using t he drift (A) [SST: ST15310000 (J-
25640-B)].
CAUTION:
 Never reuse front oil seal.
 Never incline the new front oil seal when installing.
2. Align the matching mark (B) of drive pinion with the matching mark (A) of companion flange (1), and then install the compan-
ion flange.
3. Apply anti-corrosion oil to the thread and seat of new drive pin- ion lock nut, and temporarily tighten drive pinion lock nut to drive
pinion, using a flange wrench (commercial service tool).
CAUTION:
Never reuse drive pinion lock nut.
4. Tighten drive pinion lock nut within the limits of specified torque so as to keep the pinion bearing preload within a standard val-
ues, using the preload gauge (A) [SST: ST3127S000 (J-25765-
A)].
CAUTION:
 Adjust to the lower limit of the drive pinion lock nut tight-
ening torque first.
 If the preload torque exceeds the specified value, replace
collapsible spacer and tighte n it again to adjust. Never
loosen drive pinion lock nut to adjust the preload torque.
5. Fit a test indicator to the inner side of companion flange (socket diameter).
6. Rotate companion flange to check for runout.
 If the runout value is outside the runout limit, follow the proce-dure below to adjust.
- Check for runout while changing the phase between compan-
ion flange and drive pinion by 90 ° step, and search for the
position where the runout is the minimum.
PDIA0752J
JSDIA0038ZZ
Total preload torque : A value that add 0.1 – 0.4
N·m (0.01 – 0.04 kg-m, 0.9 –
3.5 in-lb) to the measured
value before removing.
PDIA1007E
Companion flange runout : Refer to DLN-222, "Com-
panion Flange Runout".
JPDID0399ZZ
Revision: 2010 May2011 QX56

DLN-220
< UNIT DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
DRIVE PINION
10. Apply anti-corrosion oil to the thread and seat of drive pinion
lock nut, and temporarily tighten drive pinion lock nut to drive
pinion, using flange wrench (c ommercial service tool).
CAUTION:
Never reuse drive pinion lock nut.
11. Adjust to the drive pinion lock nut tightening torque and pinion bearing preload torque, using preload gauge [SST: ST3127S000
(J-25765-A)].
CAUTION:
 Adjust to the lower limit of the drive pinion lock nut tight-
ening torque first.
 If the preload torque exceeds the specified value, replace
collapsible spacer and tighte n it again to adjust. Never
loosen drive pinion lock nut to adjust the preload torque.
 After adjustment, rotate dri ve pinion back and forth 2 to 3
times to check for unusual no ise, rotation malfunction,
and other malfunctions.
12. Install differential case assembly. Refer to DLN-206, "
Assem-
bly".
CAUTION:
Never install rear cover at this timing.
13. Check and adjust drive gear runout, tooth contact, drive gear to drive pinion backlash, and companion flange runout. Refer to DLN-210, "
Adjustment" and DLN-220, "Adjustment".
Recheck above items. Readjust the above description, if necessary.
14. Check total preload torque. Refer to DLN-210, "
Adjustment".
15. Install rear cover. Refer to DLN-206, "
Assembly".
AdjustmentINFOID:0000000006222428
COMPANION FLANGE RUNOUT
1. Fit a test indicator to the inner side of the companion flange
(socket diameter).
2. Rotate companion flange to check for runout.
3. If the runout value is outside t he runout limit, follow the proce-
dure below to adjust.
a. Check for runout while changing the phase between companion flange and drive pinion by 90 ° step, and search for the position
where the runout is the minimum.
b. If the runout value is still outside of the limit after the phase has been changed, possible cause will be an
assembly malfunction of drive pinion and pinion bearing and malfunction of pinion bearing. Check for
these items and repair if necessary.
c. If the runout value is still outside of the limit after the check and repair, replace companion flange.
InspectionINFOID:0000000006222429
INSPECTION AFTER DISASSEMBLY
Drive Gear and Drive Pinion
 Clean up the disassembled parts.
 If the gear teeth never mesh or line-up correctly, det ermine the cause and adjust or replace as necessary.
Pinion bearing preload : Refer to
DLN-222, "
Pre-
load Torque".
JSDIA0047ZZ
Inner side of companion
flange runout: Refer to
DLN-222, "Com-
panion Flange Runout".
JPDID0399ZZ
Revision: 2010 May2011 QX56

EC-1
ENGINE
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CONTENTS
ENGINE CONTROL SYSTEM
VK56VD
PRECAUTION ................ ...............................
9
PRECAUTIONS .............................................. .....9
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
9
Precaution for Procedure without Cowl Top Cover ......9
Precautions For Xenon Headlamp Service ...............9
On Board Diagnostic (OBD) System of Engine
and A/T ....................................................................
10
General Precautions ...............................................10
PREPARATION ...........................................14
PREPARATION .............................................. ....14
Special Service Tools .......................................... ....14
Commercial Service Tools ......................................14
SYSTEM DESCRIPTION .............................16
COMPONENT PARTS ................................... ....16
Component Parts Location .................................. ....16
Component Description ...........................................19
Accelerator Pedal Position Sensor ..........................21
Air Fuel Ratio (A/F) Sensor 1 ..................................21
ASCD Brake Switch & Stop Lamp Switch ...............21
ASCD Steering Switch ............................................21
ASCD Indicators ......................................................21
Battery Current Sensor (With Battery Tempera-
ture Sensor) ............................................................
22
Camshaft Position Sensor .......................................22
Crankshaft Position Sensor .....................................23
ECM ........................................................................23
Electric Throttle Control Actuator ............................23
Electrically-controlled cooling fan coupling .............24
Engine Coolant Temperature Sensor ......................25
Engine Oil Temperature Sensor ..............................25
EVAP Control System Pressure Sensor .................26
EVAP Canister Vent Control Valve .........................26
EVAP Canister Purge Volume Control Solenoid
Valve .................................................................... ....
26
Fuel Injector .............................................................26
Fuel Level Sensor ....................................................26
Fuel Pump Control Module ......................................27
Fuel Rail Pressure Sensor .......................................27
Fuel Tank Temperature Sensor ...............................27
Heated Oxygen Sensor 2 ........................................27
High Pressure Fuel Pump .......................................28
ICC Brake Switch & Stop Lamp Switch ...................29
ICC Steering Switch ................................................29
Ignition Coil With Power Transistor .........................29
Intake Valve Timing Control Solenoid Valve ...........29
Knock Sensor ...................................................... ....30
Low Fuel Pressure Sensor ......................................30
Low Pressure Fuel Pump ........................................30
Malfunction Indicator Lamp (MIL) ............................30
Manifold Absolute Pressure Sensor ........................31
Mass Air Flow Sensor (With Intake Air Tempera-
ture Sensor) .............................................................
31
Power Steering Pressure (PSP) Sensor ..................31
Refrigerant Pressure Sensor ............................... ....32
VVEL Actuator Motor ...............................................32
VVEL Actuator Motor Relay .....................................32
VVEL Control Module ..............................................32
VVEL Control Shaft Position Sensor .......................32
STRUCTURE AND OPERATION .....................33
Positive Crankcase Ventilation ................................33
On Board Refueling Vapor Recovery (ORVR) ........34
SYSTEM ............................................................35
ENGINE CONTROL SYSTEM ........................ ...........35
ENGINE CONTROL SYSTEM : System Diagram ....35
ENGINE CONTROL SYSTEM : System Descrip-
tion ...........................................................................
35
DIRECT INJECTION GASOLINE SYSTEM .......... ....36
DIRECT INJECTION GASOLINE SYSTEM :
System Diagram .....................................................
36
Revision: 2010 May2011 QX56

EC-8
P2A00, P2A03 A/F SENSOR 1 .......................487
DTC Logic ............................................................ ..487
Diagnosis Procedure .............................................487
ASCD BRAKE SWITCH ................................. .490
Component Function Check ................................ ..490
Diagnosis Procedure .............................................490
Component Inspection (ASCD Brake Switch) .......491
ASCD INDICATOR ..........................................492
Component Function Check ................................ ..492
Diagnosis Procedure .............................................492
ELECTRICAL LOAD SIGNAL .........................493
Description ........................................................... ..493
Component Function Check ..................................493
Diagnosis Procedure .............................................493
ELECTRICALLY-CONTROLLED COOLING
FAN COUPLING ..............................................
495
Component Function Check ................................ ..495
Diagnosis Procedure .............................................495
FUEL INJECTOR .............................................498
Component Function Check ................................ ..498
Diagnosis Procedure .............................................498
Component Inspection ...........................................499
HIGH PRESSURE FUEL PUMP ......................501
Component Function Check ................................ ..501
Diagnosis Procedure .............................................501
Component Inspection ...........................................502
ICC BRAKE SWITCH ......................................503
Component Function Check ................................ ..503
Diagnosis Procedure .............................................503
Component Inspection (ICC Brake Switch) ...........505
IGNITION SIGNAL ...........................................506
Component Function Check ................................ ..506
Diagnosis Procedure .............................................506
Component Inspection (Ignition Coil with Power
Transistor) .............................................................
509
Component Inspection (Condenser) ......................510
INFORMATION DISPLAY (ASCD) ..................511
Component Function Check ................................ ..511
Diagnosis Procedure .............................................511
LOW PRESSURE FUEL PUMP ......................512
Component Function Check ................................ ..512
Diagnosis Procedure .............................................512
Component Inspection (Low Pressure Fuel Pump)
..
513
Component Inspection (FPCM) .............................514
MALFUNCTION INDICATOR LAMP ...............515
Component Function Check ................................ ..515
Diagnosis Procedure .............................................515
ON BOARD REFUELING VAPOR RECOV-
ERY (ORVR) .....................................................
516
Component Function Check ................................ .516
Diagnosis Procedure .............................................516
Component Inspection (EVAP Vapor Cut Valve) . .518
REFRIGERANT PRESSURE SENSOR ......... ..520
Component Function Check ................................ .520
Diagnosis Procedure .............................................520
SNOW MODE SWITCH ....................................522
Description ........................................................... .522
Component Function Check .................................522
Diagnosis Procedure .............................................522
Component Inspection ..........................................523
SYMPTOM DIAGNOSIS ...........................524
ENGINE CONTROL SYSTEM SYMPTOMS .. ..524
Symptom Table .................................................... .524
NORMAL OPERATING CONDITION ...............529
Description ........................................................... .529
PERIODIC MAINTENANCE ......................530
IDLE SPEED .......................... ...........................530
Inspection ............................................................. .530
IGNITION TIMING .............................................531
Inspection ............................................................. .531
EVAP LEAK CHECK ........................................532
Inspection ............................................................. .532
POSITIVE CRANKCASE VENTILATION .........534
Inspection ............................................................. .534
REMOVAL AND INSTALLATION .............535
ECM ................................................................ ..535
Removal and Installation ...................................... .535
VVEL CONTROL MODULE .............................536
Removal and Installation ...................................... .536
FUEL PUMP CONTROL MODULE (FPCM) ....537
Removal and Installation ...................................... .537
SERVICE DATA AND SPECIFICATIONS
(SDS) ........ .................................................
538
SERVICE DATA AND SPECIFICATIONS
(SDS) .............................................................. ..
538
Idle Speed ............................................................ .538
Ignition Timing .......................................................538
Calculated Load Value ..........................................538
Mass Air Flow Sensor ...........................................538
Revision: 2010 May2011 QX56

ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-51
< SYSTEM DESCRIPTION > [VK56VD]
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
Diagnosis DescriptionINFOID:0000000006217720
This system is an on board diagnostic system that re
cords exhaust emission-related diagnostic information
and detects a sensors/actuator-related malfunction. A ma lfunction is indicated by the malfunction indicator
lamp (MIL) and stored in ECU memory as a DTC. The diagnostic information can be obtained with the diag-
nostic tool (GST: Generic Scan Tool).
GST (Generic Scan Tool)INFOID:0000000006217721
When GST is connected with a data link connector equipped on the vehicle side, it will communicate with the
control unit equipped in the vehicle and then enable va rious kinds of diagnostic tests. Refer to GI-48, "
Descrip-
tion".
NOTE:
Service $0A is not applied for r egions where it is not mandated.
Revision: 2010 May2011 QX56

BASIC INSPECTIONEC-139
< BASIC INSPECTION > [VK56VD]
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BASIC INSPECTION
Work ProcedureINFOID:0000000006217739
1.INSPECTION START
1. Check service records for any recent repairs that ma y indicate a related malfunction, or a current need for
scheduled maintenance.
2. Open engine hood and check the following:
- Harness connectors for improper connections
- Wiring harness for improper connections, pinches and cut
- Vacuum hoses for splits, kinks and improper connections
- Hoses and ducts for leakage
- Air cleaner clogging
- Gasket
3. Check that electrical or mechanical loads are not applied.
- Headlamp switch is OFF.
- Air conditioner switch is OFF.
- Rear window defogger switch is OFF.
- Steering wheel is in the straight-ahead position, etc.
4. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
Check that engine stays below 1,000 rpm.
5. Run engine at approximately 2,000 rpm for approximately 2 min- utes under no load.
6. Check that no DTC is displayed with CONSULT-III or GST.
Are any DTCs detected?
YES >> GO TO 2.
NO >> GO TO 3.
2.REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnosis Procedure.
>> GO TO 3
3.CHECK IDLE SPEED
1. Run engine at approximately 2,000 rpm for approximately 2 minutes under no load.
SEF983U
SEF976U
SEF977U
Revision: 2010 May2011 QX56