2007 INFINITI QX56 tire pressure

TROUBLE DIAGNOSIS
TF-37
< SERVICE INFORMATION >
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VHCL/S COMP [km/h] or
[mph]Vehicle speedVehicle stopped 0 km/h (0 MPH)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition.Approximately
equal to the indica-
tion on speedome-
ter (Inside of
±10%)
COMP CL TORQ [kgm]Condition of control
torque• Vehicle stopped
• Engine running
• A/T selector lever “N” posi-
tion
• Brake pedal depressed4WD shift switch: 2WD 0 kg-m
4WD shift switch: AUTO39 - 1,353 N·m
(4 - 138 kg-m, 29 -
998 ft-lb)
4WD shift switch: 4H or
4LO1,353 N·m
(138 kg-m, 998 ft-
lb)
DUTY SOLENOID [%]Condition of clutch pres-
sure solenoid• Vehicle stopped
• Engine running
• A/T selector lever “N” posi-
tion
• Brake pedal depressed4WD shift switch: 2WD 4%
4WD shift switch: AUTO 96 - 4%
4WD shift switch: 4H or
4LO4%
2-4WD SOL [ON/OFF]Condition of 2-4WD shift
solenoid valve• Vehicle stopped
• Engine running
• A/T selector lever “N” posi-
tion
• Brake pedal depressed4WD shift switch: 2WD OFF
4WD shift switch: AUTO
ON 4WD shift switch: 4H
4WD shift switch: 4LO
4WD shift switch: AUTO
(“Wait” function is operat-
ing.)OFF
4WD shift switch: 4H
(“Wait” function is operat-
ing.)OFF
2-4WD SOL MON [ON/
OFF]Check signal for transfer
control unit signal output• Vehicle stopped
• Engine running
• A/T selector lever “N” posi-
tion
• Brake pedal depressed4WD shift switch: 2WD OFF
4WD shift switch: AUTO
ON 4WD shift switch: 4H
4WD shift switch: 4LO
4WD shift switch: AUTO
(“Wait” function is operat-
ing.)OFF
4WD shift switch: 4H
(“Wait” function is operat-
ing.)OFF
MOTOR RELAY [ON/
OFF]Condition of transfer mo-
tor relay• Accelerator pedal de-
pressed
• Vehicle stopped
• Engine running
• Brake pedal depressed4WD shift switch: 2WD OFF
4WD shift switch: AUTO
or 4LO (A/T selector lever
“P” or “N” position)OFF
("ON" for approx. 2
sec. after shifting
to “P” and “N”.)
4WD shift switch: AUTO
or 4LO (Except for A/T se-
lector lever “P” or “N” po-
sition)ON
4WD shift switch: 4H (A/T
selector lever “P” posi-
tion)OFF
("ON" for approx. 2
sec. after shifting
to “P”.)
4WD shift switch: 4H (Ex-
cept for A/T selector lever
“P” position)ON Monitored item [Unit] Content Condition Display value

TROUBLE DIAGNOSIS FOR SYMPTOMS
TF-111
< SERVICE INFORMATION >
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Dose 4WD shift indicator lamp keep flashing?
YES >> GO TO 2.
NO >> Inspection End.
2.CHECK SYSTEM FOR WAIT DETECTION SWITCH
Perform trouble diagnosis for wait detection switch system. Refer to TF-60, "
Wait Detection Switch".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3.CHECK SYSTEM FOR NEUTRAL-4LO SWITCH
Perform trouble diagnosis for neutral-4LO switch system. Refer to TF-54, "
Neutral-4LO Switch".
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.SYMPTOM CHECK
Check again.
OK or NG
OK >> Inspection End.
NG >> GO TO 5.
5.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-35, "
Transfer Control Unit Input/Output Signal Ref-
erence Value".
OK or NG
OK >> GO TO 6.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
6.CHECK TRANSFER INNER PARTS
1. Disassemble transfer assembly. Refer to TF-128, "
Disassembly and Assembly".
2. Check transfer inner parts.
OK or NG
OK >> Inspection End.
NG >> Repair or replace damaged parts.
4WD Warning Lamp Flashes RapidlyINFOID:0000000003532558
SYMPTOM:
While driving, 4WD warning lamp flashes rapidly.
NOTE:
Rapid flashing: 2 times/second
DIAGNOSTIC PROCEDURE
1.CHECK TIRE
Check the following.
• Tire pressure
• Wear condition
• Longitudinal tire size (There is no difference between longitudinal tires.)
OK or NG
OK >> GO TO 2.
NG >> Repair or replace damaged parts.
2.CHECK 4WD WARNING LAMP
Stop the vehicle and allow it to idle for a short period of time.
Does flashing stop?

TF-112
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYMPTOMS
YES >> Inspection End.
NO >> GO TO 3.
3.CHECK TRANSFER FLUID TEMPERATURE
Perform trouble diagnosis for transfer fluid temperature system. Refer to TF-90, "
Transfer Fluid Temperature".
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.SYMPTOM CHECK
Check again.
OK or NG
OK >> Inspection End.
NG >> GO TO 5.
5.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-35, "
Transfer Control Unit Input/Output Signal Ref-
erence Value".
OK or NG
OK >> Inspection End.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
4WD Warning Lamp Flashes SlowlyINFOID:0000000003532559
SYMPTOM:
While driving, 4WD warning lamp flashes slowly. (When continuing to flash until turning ignition
switch OFF.)
NOTE:
Slow flashing: 1 time/2 seconds
DIAGNOSTIC PROCEDURE
1.CHECK TIRE
Check the following.
• Tire pressure
• Wear condition
• Longitudinal tire size (There is no difference between longitudinal tires.)
OK or NG
OK >> GO TO 2.
NG >> Repair or replace damaged parts.
2.CHECK TRANSFER FLUID TEMPERATURE
Perform trouble diagnosis for transfer fluid temperature system. Refer to TF-90, "
Transfer Fluid Temperature".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3.CHECK CLUTCH PRESSURE SWITCH
Perform trouble diagnosis for clutch pressure switch system. Refer to TF-92, "
Clutch Pressure Switch".
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.SYMPTOM CHECK
Check again.
OK or NG
OK >> Inspection End.

WT-1
SUSPENSION
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SECTION WT
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PCONTENTS
ROAD WHEELS & TIRES
SERVICE INFORMATION ............................2
PRECAUTIONS ...................................................2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
2
PREPARATION ...................................................3
Special Service Tool .................................................3
Commercial Service Tool ..........................................3
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING .............................
4
NVH Troubleshooting Chart ......................................4
WHEEL ................................................................5
Inspection ..................................................................5
WHEEL AND TIRE ASSEMBLY .........................6
Balancing Wheels .....................................................6
Rotation .....................................................................7
LOW TIRE PRESSURE WARNING SYSTEM .....8
System Component ...................................................8
System Description ...................................................8
CAN COMMUNICATION ....................................10
System Description .................................................10
TROUBLE DIAGNOSIS .....................................11
Wiring Diagram- T/WARN - .....................................11
Terminal and Reference Value (BCM) ....................12
ID Registration Procedure .......................................12
Transmitter Wake Up Operation .............................14
CONSULT-II Function (BCM) ..................................15
Self-Diagnosis .........................................................15
How to Perform Trouble Diagnosis for Quick and
Accurate Repair .......................................................
17
Preliminary Check ...................................................18
Flash Code/Symptom Chart ....................................18
TROUBLE DIAGNOSIS FOR SELF-DIAG-
NOSTIC ITEMS .................................................
20
Data from Transmitter Not Being Received .............20
Transmitter Malfunction ...........................................20
Transmitter Pressure Malfunction ............................21
Vehicle Speed Signal ..............................................21
Ignition Signal ..........................................................22
TROUBLE DIAGNOSIS FOR SYMPTOMS ......23
Low Tire Pressure Warning Lamp Does Not Come
On When Ignition Switch Is Turned On ...................
23
Low Tire Pressure Warning Lamp Stays On When
Ignition Switch Is Turned On ...................................
23
Low Tire Pressure Warning Lamp Flashes When
Ignition Switch Is Turned On ...................................
24
Hazard Warning Lamps Flash When Ignition
Switch Is Turned On ................................................
25
"TIRE PRESSURE" Information in Display Unit
Does Not Exist .........................................................
25
ID Registration Cannot Be Completed ....................25
REMOVAL AND INSTALLATION .....................26
Transmitter (Pressure Sensor) ................................26
SERVICE DATA AND SPECIFICATIONS
(SDS) .................................................................
28
Road Wheel .............................................................28
Tire ..........................................................................28

WT-4
< SERVICE INFORMATION >
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting ChartINFOID:0000000003532688
Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
×: ApplicableReference page
WT-5WT-6WT-28WT-7—
—
WT-28
FFD-6, "
NVH Troubleshooting Chart
" (FFD),
RFD-7, "
NVH Troubleshooting Chart
" (RFD)
FA X - 4 , "
NVH Troubleshooting Chart
" (FAX),
FSU-4, "
NVH Troubleshooting Chart
" (FSU)
RAX-4, "
NVH Troubleshooting Chart
" (RAX),
RSU-4, "
NVH Troubleshooting Chart
" (RSU)
Refer to TIRES in this chart.
Refer to ROAD WHEEL in this chart.
BR-4, "
NVH Troubleshooting Chart
"
PS-5, "
NVH Troubleshooting Chart
"
Possible cause and SUSPECTED PARTS
Out-of-round
Imbalance
Incorrect tire pressure
Uneven tire wear
Deformation or damage
Non-uniformity
Incorrect tire size
DIFFERENTIAL
FRONT AXLE AND FRONT SUSPENSION
REAR AXLE AND REAR SUSPENSION
TIRES
ROAD WHEEL
BRAKE
STEERING
SymptomTIRESNoise× ××××× × × × × ××
Shake× ×××× × × × × ××
Vibration××××××
Shimmy× ×××××× × × × ××
Shudder× ×××× × × × × ××
Poor quality ride or
handling× ×××× × × × ×
ROAD
WHEELNoise×× × ××× ×××
Shake×× × ×× ×××
Shimmy, shudder×× × ×× ×××
Poor quality ride or
handling×× × ×× ×

WHEEL AND TIRE ASSEMBLY
WT-7
< SERVICE INFORMATION >
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c. If calculated balance weight value exceeds 50 g (1.76 oz), install
two balance weight sheets in line with each other as shown.
CAUTION:
Do not install one balance weight sheet on top of another.
3. Start wheel balancer again.
4. Install drive-in balance weight on inner side of road wheel in the
wheel balancer indication position (angle).
CAUTION:
Do not install more than two balance weights.
5. Start wheel balancer. Make sure that inner and outer residual
imbalance values are 5 g (0.18 oz) each or below.
• If either residual imbalance value exceeds 5 g (0.18 oz),
repeat installation procedures.
Wheel balance (Maximum allowable imbalance):
RotationINFOID:0000000003532691
NOTE:
Follow the maintenance schedule for tire rotation service intervals. Refer to MA-6
.
1. Rotate the tires on each side from front to back as shown. Do
not include the spare tire when rotating the tires.
CAUTION:
When installing wheels, tighten them diagonally by dividing
the work two to three times in order to prevent the wheels
from developing any distortion.
2. Adjust the tire pressure to specification. Refer to WT-28, "
Tire" .
3. After the tire rotation, retighten the wheel nuts after the vehicle
has been driven for 1,000 km (600 miles), and also after every
wheel and tire have been installed such as after repairing a flat tire.
Maximum allowable imbalanceDynamic (At rim flange) 5 g (0.18 oz) (one side)
Static 10 g (0.35 oz)
SMA056D
Wheel nut torque : 133 N·m (14 kg-m, 98 ft-lb)
SMA829C

WT-8
< SERVICE INFORMATION >
LOW TIRE PRESSURE WARNING SYSTEM
LOW TIRE PRESSURE WARNING SYSTEM
System ComponentINFOID:0000000003532692
System DescriptionINFOID:0000000003532693
BODY CONTROL MODULE (BCM)
The BCM is shown with the lower instrument panel LH removed. The
BCM reads the air pressure signal received by the remote keyless
entry receiver, and controls the low tire pressure warning lamp as
shown below. It also has a self-diagnosis function to detect a system
malfunction.
TRANSMITTER
A sensor-transmitter integrated with a valve is installed in each
wheel, and transmits a detected air pressure signal in the form of a
radio wave. The radio signal is received by the remote keyless entry
receiver.
WEIA0081E
Condition Low tire pressure warning lamp
System normal On for 1 second after ignition ON
Tire less than 193 kPa (2.0 kg/cm
2 , 28 psi)
[Flat tire]ON
Low tire pressure warning system malfunc-
tionAfter key ON, flashes once per sec-
ond for 1 minute, then stays ON
LEIA0068E
WEIA0137E

LOW TIRE PRESSURE WARNING SYSTEM
WT-9
< SERVICE INFORMATION >
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REMOTE KEYLESS ENTRY RECEIVER
The remote keyless entry receiver is shown with the instrument
panel RH removed. The remote keyless entry receiver receives the
air pressure signal transmitted by the transmitter in each wheel.
COMBINATION METER
The combination meter receives tire pressure status from the BCM
using CAN communication. When a low tire pressure condition is
sensed by the BCM, the combination meter low tire pressure warn-
ing lamp is activated.
DISPLAY UNIT
Displays the air pressure of each tire.
• After the ignition switch is turned on, the pressure values will not
be displayed until the data of each wheel is received.
LEIA0069E
LEIA0055E
LEIA0067E