wheel INFINITI QX56 2010 Factory Service Manual

TM-118
< ECU DIAGNOSIS >
TCM
Even when the electronic circuits are normal, under special conditions (for example, when slamming on the
brake with the wheels spinning drastically and stopping the tire rotation), the transmission can go into fail-safe
mode. If this happens, switch “OFF” the ignition switch for 10 seconds, then switch it “ON” again to return to
the normal shift pattern. Therefore, the customer's v ehicle has returned to normal, so handle according to the
“diagnostics flow” (Refer to TM-5, "
Work Flow").
FAIL-SAFE FUNCTION
If any malfunction occurs in a sensor or solenoid, th is function controls the A/T to mark driving possible.
Output Speed Sensor
• Signals are input from two systems - from output speed sensor installed on the transmission and from com-
bination meter so normal driving is possible even if there is a malfunction in one of the systems. And if output
speed sensor has unusual cases, 5GR is prohibited.
Accelerator Peda l Position Sensor
• If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according
to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow sys-
tems, the engine speed is fixed by ECM to a pre-determined engine speed to make driving possible.
Throttle Position Sensor
• If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according
to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow sys-
tems, the accelerator opening angle is controlled by the idle signal sent from the ECM which is based on
input indicating either idle condition or off-idle condition (pre-determined accelerator opening) in order to
make driving possible.
Transmission Range Switch
• In the unlikely event that a malfunction signal enters t he TCM, the position indicator is switched “OFF”, the
starter relay is switched “OFF” (starter starting is disabled), the back-up lamp relay switched “OFF” (back-up
lamp is OFF) and the position is fixed to the “D” position to make driving possible.
Starter Relay
• The starter relay is switched “OFF”. (Starter starting is disabled.)
Interlock
• If there is an interlock judgment malfunction, the trans mission is fixed in 2GR to make driving possible.
NOTE:
When the vehicle is driven fixed in 2GR, a input speed sensor malfunction is displayed, but this is
not a input speed sensor malfunction.
• When the interlock is detected at the 3GR or more, it is locked at the 2GR.
1st Engine Braking
• When there is an 1st engine brake judgment malfunction, the low coast brake solenoid is switched “OFF” to
avoid the engine brake operation.
Line Pressure Solenoid
• The solenoid is switched “OFF” and the line pressure is set to the maximum hydraulic pressure to make driv- ing possible.
Torque Converter Clutch Solenoid
• The solenoid is switched “OFF” to release the lock-up.
Low Coast Brake Solenoid
• When a (electrical or functional) malfunction occurs, in order to make driving possible, the engine brake isnot applied in 1GR and 2GR.
Input Clutch Solenoid
• If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is
held in 4GR to make driving possible.
Direct Clutch Solenoid
• If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is
held in 4GR to make driving possible.
Front Brake Solenoid
• If a (electrical or functional) malfunction occurs with the solenoid “ON”, in order to make driving possible, the
A/T is held in 5GR; if the solenoid is OFF, 4GR.
Revision: April 20092010 QX56

VTL-1
VENTILATION, HEATER & AIR CONDITIONER
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SECTION VTL
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VTL
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CONTENTS
VENTILATION SYSTEM
PRECAUTION ....... ........................................2
PRECAUTIONS .............................................. .....2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
2
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ............................... ......
2
Precaution for Working with HFC-134a (R-134a) ......3
Precaution for Procedure without Cowl Top Cover ......3
PREPARATION ............................................4
PREPARATION .............................................. .....4
Commercial Service Tool .................................... ......4
FUNCTION DIAGNOSIS ...............................5
IN-CABIN MICROFILTER .............................. .....5
Description .......................................................... ......5
ON-VEHICLE MAINTENANCE .....................6
IN-CABIN MICROFILTER .............................. .....6
Removal and Installation ...........................................6
ON-VEHICLE REPAIR .... ..............................7
CONTROL UNIT ..................................................7
Removal and Installation ...........................................7
IN-VEHICLE SENSOR ................................... .....9
Removal and Installation ...........................................9
OPTICAL SENSOR ........................................ ....10
Removal and Installation .........................................10
INTAKE SENSOR ..............................................11
Removal and Installation .........................................11
BLOWER MOTOR .......................................... ....12
Component .......................................................... ....12
Removal and Installation .........................................12
VARIABLE BLOWER CONTROL .....................14
Components ............................................................14
Removal and Installation .........................................15
HEATER & COOLING UNIT ASSEMBLY ........16
Component ..............................................................16
Removal and Installation .........................................17
EVAPORATOR .................................................19
Removal and Installation for Front Evaporator ........19
Removal and Installation for Rear Evaporator .........20
EXPANSION VALVE .........................................22
Removal and Installation for Rear Expansion
Valve .................................................................... ....
22
HEATER CORE .................................................23
Component ..............................................................23
Removal and Installation .........................................24
DEFROSTER DOOR MOTOR ..........................26
Removal and Installation .........................................26
INTAKE DOOR MOTOR ...................................27
Removal and Installation .........................................27
MODE DOOR MOTOR ......................................28
Components ............................................................28
Removal and Installation .........................................29
AIR MIX DOOR MOTOR ...................................30
Component ..............................................................30
Removal and Installation .........................................31
DUCTS AND GRILLES .....................................33
Component ..............................................................33
Removal and Installation .........................................36
Revision: April 20092010 QX56

VTL-2
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005403098
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harn esses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electri c power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers , always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation After Battery Disconnect
INFOID:0000000005403099
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK ″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery pow er is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated.
4. Perform the necessary repair operation.
Revision: April 20092010 QX56

VTL-12
< ON-VEHICLE REPAIR >
BLOWER MOTOR
BLOWER MOTOR
ComponentINFOID:0000000005147609
Front Blower MotorRear Blower Motor
Removal and InstallationINFOID:0000000005147610
FRONT BLOWER MOTOR
Removal
1. Remove the glove box assembly. Refer to IP-17, "Removal and Installation".
2. Disconnect the front blower motor electrical connector.
3. Remove the three screws and remove the front blower motor.
4. Remove the blower motor wheel as necessary to transfer to the new blower motor.
Installation
Installation is in the reverse order of removal.
LJIA0136E
1. Front heater and cooling unit assembly 2. Front blower motor 3. Front variable blower control
AWIIA0085ZZ
1. Rear blower motor2. Rear heater and cooling unit assembly 3. Rear variable blower control
Revision: April 20092010 QX56

BLOWER MOTORVTL-13
< ON-VEHICLE REPAIR >
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REAR BLOWER MOTOR
Removal
1. Remove the rear heater and cooling unit assembly. Refer to VTL-17, "Removal and Installation".
2. Disconnect the rear blower motor electrical connector.
3. Remove the three screws and remove the rear blower motor.
4. Remove the blower motor wheel as necessary to transfer to the new blower motor.
Installation
Installation is in the reverse order of removal.
Revision: April 20092010 QX56

WCS-2
Wiring Diagram .......................................................23
ECU DIAGNOSIS ..................................... ...28
COMBINATION METER ................................. ...28
Reference Value .................................................. ...28
Wiring Diagram .......................................................30
Fail Safe .................................................................47
DTC Index ..............................................................48
BCM (BODY CONTROL MODULE) ..................50
Reference Value .................................................. ...50
Terminal Layout ......................................................53
Physical Values ......................................................53
Wiring Diagram .......................................................59
Fail Safe .................................................................63
DTC Inspection Priority Chart ..............................64
DTC Index ........................................................... ...64
SYMPTOM DIAGNOSIS .............................66
THE LIGHT REMINDER WARNING DOES
NOT SOUND ................................................... ...
66
Description ........................................................... ...66
Diagnosis Procedure ...............................................66
THE SEAT BELT WARNING CONTINUES
SOUNDING, OR DOES NOT SOUND ...............
67
Description ........................................................... ...67
Diagnosis Procedure ...............................................67
THE KEY WARNING DOES NOT SOUND .......68
Description ........................................................... ...68
Diagnosis Procedure ...............................................68
PRECAUTION ............................................69
PRECAUTIONS .............................................. ...69
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. ...
69
Necessary for Steering Wheel Rotation After Bat-
tery Disconnect .................................................... ...
69
Revision: April 20092010 QX56

WCS
PRECAUTIONSWCS-69
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005238466
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Un it or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or el ectric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the battery, and wait at least 3 minutes before performing any service.
Necessary for Steering Wheel Ro tation After Battery DisconnectINFOID:0000000005238467
NOTE:
• Before removing and installing any control units, first tu rn the push-button ignition switch to the LOCK posi-
tion, then disconnect both battery cables.
• After finishing work, confirm that all control unit connectors are connected properly, then re-connect both
battery cables.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If a DTC is detected, perform trouble diagnos is according to self-diagnosis results.
This vehicle is equipped with a push-button ignition switch and a steering lock unit.
If the battery is disconnect ed or discharged, the steering wheel will lock and cannot be turned.
If turning the steering wheel is required with the battery disconnected or discharged, follow the procedure
below before starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Carry the Intelligent Key or insert it to the key slot and turn the push-button ignition switch to ACC position. (At this time, the steering lock will be released.)
3. Disconnect both battery cables. The steering lock will remain released with both battery cables discon- nected and the steering wheel can be turned.
4. Perform the necessary repair operation.
5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button ignition switch is turned to LOCK position.)
Revision: April 20092010 QX56

WT-1
SUSPENSION
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SECTION WT
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WT
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O PCONTENTS
ROAD WHEELS & TIRES
BASIC INSPECTION ....... .............................3
DIAGNOSIS AND REPAIR WORKFLOW ..... .....3
Repair Work Flow ................................................ ......3
INSPECTION AND ADJUSTMENT .....................5
Preliminary Check ............................................... ......5
Transmitter Wake Up Operation ...............................5
ID Registration Procedure .........................................6
FUNCTION DIAGNOSIS ...............................8
TPMS .............................................................. .....8
System Diagram .................................................. ......8
System Description ...................................................8
System Component .................................................10
DIAGNOSIS SYSTEM (BCM) ............................11
CONSULT-III Function (BCM) ............................. ....11
Self-Diagnosis (Without CONSULT-III) ...................12
COMPONENT DIAGNOSIS .........................14
C1708 - C1711 DATA FROM TRANSMITTER
NOT BEING RECEIVED ................................. ....
14
Description .......................................................... ....14
DTC Logic ...............................................................14
Diagnosis Procedure ...............................................14
Special Repair Requirement ...................................15
C1712 - C1715, C1720 - C1723, C1724 -
C1727 TRANSMITTER MALFUNCTION ....... ....
16
Description .......................................................... ....16
DTC Logic ...............................................................16
Diagnosis Procedure ...............................................16
Special Repair Requirement ...................................17
C1716 - C1719 TRANSMITTER PRESSURE
MALFUNCTION .............................................. ....
18
Description .......................................................... ....18
DTC Logic ...............................................................18
Diagnosis Procedure ...............................................18
Special Repair Requirement ................................ ....18
C1729 VEHICLE SPEED SIGNAL ....................19
Description ...............................................................19
DTC Logic ................................................................19
Diagnosis Procedure ...............................................19
Special Repair Requirement ....................................19
C1735 IGNITION SIGNAL .................................20
Description ...............................................................20
DTC Logic ................................................................20
Diagnosis Procedure ...............................................20
Special Repair Requirement ....................................20
ECU DIAGNOSIS .........................................21
BCM (BODY CONTROL MODULE) .................21
Reference Value .................................................. ....21
Terminal Layout .......................................................24
Physical Values ................................................... ....24
Wiring Diagram - TIRE PRESSURE MONITOR-
ING SYSTEM - ........................................................
30
Self-Diagnosis (With CONSULT-III) .................... ....33
Self-Diagnosis (Without CONSULT-III) ...................34
SYMPTOM DIAGNOSIS ..............................36
TPMS .................................................................36
Symptom Table ................................................... ....36
LOW TIRE PRESSURE WARNING LAMP
DOES NOT TURN ON .......................................
37
Low Tire Pressure Warning Lamp Does Not Come
On When Ignition Switch Is Turned On ...................
37
LOW TIRE PRESSURE WARNING LAMP
STAYS ON ........................................................
38
Low Tire Pressure Warning Lamp Stays On When
Ignition Switch Is Turned On ............................... ....
38
LOW TIRE PRESSURE WARNING LAMP
BLINKS .............................................................
39
Revision: April 20092010 QX56

WT-2
Low Tire Pressure Warning Lamp Flashes When
Ignition Switch Is Turned On ..................................
39
HAZARD WARNING LAMPS FLASH ...............40
Hazard Warning Lamps Flash When Ignition
Switch Is Turned On ............................................ ...
40
"TIRE PRESSURE" INFORMATION IN DIS-
PLAY UNIT DOES NOT EXIST .........................
41
"TIRE PRESSURE" Information in Display Unit
Does Not Exist ..................................................... ...
41
ID REGISTRATION CANNOT BE COMPLET-
ED ......................................................................
42
ID Registration Cannot Be Completed ................ ...42
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ......................... ...
43
NVH Troubleshooting Chart ................................ ...43
PRECAUTION .............................................44
PRECAUTIONS .............................................. ...44
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. ...
44
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ..................................
44
PREPARATION ..........................................46
PREPARATION .............................................. ...46
Special Service Tool ............................................ ...46
Commercial Service Tool ........................................46
ON-VEHICLE MAINTENANCE ..................47
WHEEL ........................................................... ...47
Inspection ............................................................. ...47
ON-VEHICLE REPAIR ...............................48
WHEEL AND TIRE ASSEMBLY .................... ...48
Balancing Wheels ................................................ ...48
Rotation ...................................................................49
REMOVAL AND INSTALLATION ..............50
REMOVAL AND INSTALLATION .................. ...50
Transmitter (Pressure Sensor) ............................. ...50
SERVICE DATA AND SPECIFICATIONS
(SDS) .......... ................................. ...............
52
SERVICE DATA AND SPECIFICATIONS
(SDS) .............................................................. ...
52
Road Wheel ......................................................... ...52
Tire ..........................................................................52
Revision: April 20092010 QX56

WT-6
< BASIC INSPECTION >
INSPECTION AND ADJUSTMENT
3. When the BCM finishes assigning each tire ID, the BCM flashes the hazard warning lamps and sendsflashing indicator status by CAN according to the following time chart.
4. After completing wake up of all transmitters, make sure low tire pressure warning lamp goes out.
ID Registration ProcedureINFOID:0000000005148205
ID REGISTRATION WITH TRANSMITTER ACTIVATION TOOL
NOTE:
This procedure must be done after replacement of a low tire pressure warning transmitter or BCM.
New replacement transmitters are provided "asleep" and must first be "woken up" using Transmitter
Activation Tool J-45295 before ID registration can be performed.
1. Connect CONSULT-III.
2. Select "ID REGIST" under BCM.
3. Push the transmitter activation tool against the tire near the front left transmitter. Press the button for 5 seconds.
4. Register the IDs in order from FR LH, FR RH, RR RH and RR LH. When ID registration of each wheel has been completed, the hazard warning lamps flash.
5. After completing all ID registrations, press “END” to complete the procedure.
NOTE:
Be sure to register all of the IDs in order from FR LH, FR RH, RR RH, to RR LH, or the self-diagnostic results
display will not function properly.
ID REGISTRATION WITHOUT TRANSMITTER ACTIVATION TOOL
NOTE:
WEIA0177E
Tool number : (J-45295)
LEIA0036E
Step Activation tire position Hazard warning lamp CONSULT-III
1 Front LH
2 times flashing “YET”
↓
“DONE”
2F
ro n t R H
3R ear R H
4 Rear LH
Revision: April 20092010 QX56