flat tire INFINITI QX56 2011 Factory User Guide

WT-6
< SYSTEM DESCRIPTION >
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006225488
1. BCMRefer to BCS-4, "
BODY CONTROL
SYSTEM : Component Parts Loca-
tion". 2. AV control unit
Refer to AV- 9 , "
Component Parts Lo-
cation". 3. ABS actuator and electric unit (con-
trol unit)
Refer to BRC-10, "Component Parts
Location".
4. TCM
*
Refer to TM-10, "A/T CONTROL SYS-
TEM : Component Parts Location" .5. Low tire pressure warning control
unit 6. Transmitter
7. Front tire pressure receiver 8. Rear tire pressure receiver
A. Glove box assembly removed B. Wheel C. Fender protector (rear side)
D. Low tire pressure warning lamp (in
combination meter) E. Inside rear wheel house protector
*: Mainly used for the tire inflation indicator function.
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COMPONENT PARTSWT-7
< SYSTEM DESCRIPTION >
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Component DescriptionINFOID:0000000006225489
*: Mainly used for the tire inflation function.
Low Tire Pressure Warning Control UnitINFOID:0000000006225490
 After the low tire pressure warning control unit (1) receives the tire pressure signal from the tire pressure receiver, it controls the oper-
ation of the low tire pressure warning lamp, hazard warning lamp,
and horn.
NOTE:
The hazard warning lamp and the horn are used for the tire infla-
tion indicator function.
 Performs self-diagnosis of the Tire Pressure Monitoring System
(TPMS).
 Controls tire inflation indicator function.
TransmitterINFOID:0000000006225491
The transmitter (1) is installed at the position of the air valve on the
road wheel (2). It measures the ti re pressure and transmits the tire
pressure information by radio waves.
Component parts Reference/Function
Transmitter WT-7, "
Transmitter"
Tire pressure receiverWT-8, "Tire Pressure Receiver"
Low tire pressure warning control unit WT-7, "Low Tire Pressure Warning Control Unit"
Low tire pressure warning lamp WT-8, "Low Tire Pressure Warning Lamp"
AV control unit AV- 1 0 , "Component Description"
BCMBCS-6, "BODY CONTROL SYSTEM : System Description"
ABS actuator and electric unit (control unit)BRC-16, "System Description"
TCM*TM-10, "A/T CONTROL SYSTEM : Component Parts Location"
JPEIC0071ZZ
: Outside
JPEIC0013ZZ
Revision: 2010 May2011 QX56

SYSTEMWT-9
< SYSTEM DESCRIPTION >
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SYSTEM
System DescriptionINFOID:0000000006225494
 During driving, the TPMS (Tire Pressure Monitoring System) receives the signal transmitted from transmitter
installed in each wheel. The low tire pressure warning control unit has pressure judgment and trouble diag-
nosis functions. When the low tire pressure warning control unit detects low inflation pressure or another
unusual symptom, the low tire pressure warning lamps in the combination meter comes on.
 If the tire pressure is less than the specified value, t he low tire pressure warning lamp illuminates that the tire
pressure is less than the specified value.
 Activates the TPMS (Tire Pressure Monitoring Sy stem) when the vehicle speed is 40 km/h (25 MPH) or
more.
 The tire pressure information for each wheel is displayed on the vehicle information display.
 Added tire inflation indicator function to TPMS (Tire Pressure Monitoring System). Refer to WT-10, "
Tire
Inflation Indicator Function".
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL
The signal transmission/reception between units via a comm unication line is mainly as listed in the following
table.
JPEIC0084GB
Component parts Signal item
Low tire pressure warning control
unit Transmits the following signals via CAN communication to BCM.
 Low tire pressure
warning lamp signal
 Hazard request signal
 Horn request signal*
Transmits the following signals via CAN communication to the AV control unit.
 Low tire pressure warning lamp signal
 Tire pressure data signal
BCM Transmits the following signal via CAN communication to the combination meter, based on sig-
nals from low tire pressure warning control unit.
 Low tire pressure
warning lamp signal
Transmits the following signal via CAN communication to the IPDM E/R, based on signals from
low tire pressure wa rning control unit.
 Horn request signal*
Receives the following signal via CAN communication from low tire pressure warning control
unit.
 Hazard request signal
AV control unit Receives the following signals via CAN communication from low tire pressure warning control
unit.
 Low tire pressure
warning lamp signal
 Tire pressure data signal
Revision: 2010 May2011 QX56

WT-10
< SYSTEM DESCRIPTION >
SYSTEM
*: Mainly used for the tire inflation indicator function.
LOW TIRE PRESSURE WARNING LAMP CONTROL CONDITION
Uses CAN communication from the low tire pressure warning control unit to illuminate the low tire pressure
warning lamp on the combination meter.
*: Tire pressure at each condition differs.
HAZARD WARNING LAMP CONTROL CONDITION
The low tire pressure warning control unit transmits a hazard request signal to BCM. BCM blinks the hazard
warning lamp, according to the signal.
The hazard warning lamp blinks under the following conditions.
Condition of Blinking The Hazard Warning Lamp When wake-up of registered wheel has been completed. Refer to WT-28, "Work Procedure".
 When ID registration is completed. Refer to WT-29, "
Work Procedure".
 During the use of the tire inflation indicator function.
HORN CONTROL CONDITION
The low tire pressure warning control unit transmits a horn request signal to BCM. BCM controls horn sound,
according to the signal.
The horn sounds under the following condition.
Condition of Sounding Horn During the use of tire inflation indicator function.
Tire Inflation Indicator FunctionINFOID:0000000006225495
 This function operates only when the A/T shift selector position is in P-range with the ignition switch ON or
with the engine started.
NOTE:
The tire inflation indicator function is recommended to use with the engine stopped.
 This function informs the driver of the satisfaction of the recom- mended COLD tire pressure.
The hazard warning lamp blinks when reaching the recommended
COLD tire pressure during radio wave reception. After reaching the
recommended COLD tire pressure, the horn sounds once and the
hazard warning lamp stops blinking.
 When tire pressure becomes a value equal to or more than 30 kPa
(0.31 kg/cm
2, 4 psi) more than the recommended COLD tire pres-
sure, the hazard warning lamp and the horn operates three times.
After deflating the tire and reaching the recommended COLD tire
pressure, the horn sounds only once and the hazard warning lamp
stops blinking.
NOTE:
 After starting to inflate the tire, it takes a few seconds for the tire inflation indicator to function.
ABS actuator and electric unit (con-
trol unit) Transmits the vehicle speed signal (ABS) via CAN communication for low tire pressure warning
control unit.
TCM
*Transmits the P range signal via CAN communication for low tire pressure warning control unit.
Component parts Signal item
Condition Low tire pr
essure warning lamp
Ignition switch: OFF OFF
Ignition switch: ON (System normal) Warning lamp turns on for 1second, then turns OFF.
When tire pressure is low*.
[Less than 189 kPa (1.93 kg/cm
2, 27.4 psi)] ON
Tire pressure monitoring system malfunction Warning lamp blinks 1 minute, then turns ON.
When performing transmitter wake-up operation Refer to WT-28, "
Work Procedure".
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SYSTEMWT-11
< SYSTEM DESCRIPTION >
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 If there is no response for approximately 15 seconds or mo re after inflating the tires, cancel the use of the
tire inflation indicator function or move the vehicle approximately 1 m (3.2 ft) backward or forward to try
again. The air filler pressure may be weak or out of service area.
Revision: 2010 May2011 QX56

TIRE INFLATION INDICATOR DOES NOT ACTIVATEWT-59
< SYMPTOM DIAGNOSIS >
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TIRE INFLATION INDICATOR DOES NOT ACTIVATE
DescriptionINFOID:0000000006225540
The tire inflation indicator does not function while inflat ing a tire when the A/T shift selector position is in P-
range with the ignition switch ON or with the engine started.
NOTE:
 After starting to inflate the tire, it takes a few seconds for the tire inflation indicator to function.
 If there is no response for approximately 15 seconds or mo re after inflating the tires, cancel the use of the
tire inflation indicator function or move the vehicle approximately 1 m (3.2 ft) backward or forward to try
again. The air filler pressure may be weak or out of service area.
 For tire inflation indicator, Refer to WT-10, "
Tire Inflation Indicator Function".
Diagnosis ProcedureINFOID:0000000006225541
1. LOCATION CHANGE
Move the vehicle to other area and repeat the procedure of the tire inflation indicator function. Refer to WT-10,
"Tire Inflation Indicator Function".
Is the function normal?
YES >> Normal (the tire inflation indicator may not operate, depending on reception condition.)
NO >> GO TO 2.
2.PERFORM LOW TIRE PRESSURE WARNI NG CONTROL UNIT SELF-DIAGNOSIS
With CONSULT-III
1. Drive for 10 minutes at a speed of 40 km/h (25 MPH) or more.
2. Stop the vehicle.
3. Perform self-diagnosis for “AIR PRESSURE MONITOR”.
Is any DTC detected?
YES >> Perform trouble diagnosis for detected DTC. Refer to WT-18, "DTC Index".
NO >> GO TO 3.
3.CHECK HAZARD WARNING LAMP OPERATION
Check hazard warning lamp operation with hazard switch.
Does the hazard warning lamp blink?
YES >> GO TO 4.
NO >> Perform trouble diagnosis for the hazard warning lamp. Refer to EXL-113, "
Symptom Table".
4.PERFORM TCM SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “TRANSMISSION”.
Is any DTC detected?
YES >> Check malfunctioning circuit. Refer to TM-78, "DTC Index".
NO >> GO TO 5.
5.CHECK HORN OPERATION
Check horn operation. Refer to SEC-143, "
ComponentFunctionCheck".
Is the operation normal?
YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
6.PERFORM BCM SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “BCM”.
Is any DTC detected?
YES >> Check malfunctioning circuit. Refer to BCS-57, "DTCIndex".
NO >> Replace low tire pressure warning control unit. Refer to WT-65, "
Removal and Installation".
Revision: 2010 May2011 QX56

WT-64
< REMOVAL AND INSTALLATION >
ROAD WHEEL TIRE ASSEMBLY
REMOVAL AND INSTALLATION
ROAD WHEEL TIRE ASSEMBLY
Exploded ViewINFOID:0000000006225547
Removal and InstallationINFOID:0000000006225548
REMOVAL
1. Remove wheel nuts.
2. Remove tire assembly.
INSTALLATION
Note the following, install in the reverse order of removal.
 When replacing or rotating wheels, perform the ID registration. Refer to WT-29, "
Work Procedure".
InspectionINFOID:0000000006225549
ALUMINUM WHEEL
1. Check tires for wear and improper inflation.
2. Check wheels for deformation, cracks and other damage. If deformed, remove wheel and check wheel
runout.
a. Remove tire from aluminum wheel and mount on a tire balance machine.
b. Set dial indicator as shown in the figure.
c. Check radial runout, if the latera l deflection (A) or vertical deflec-
tion (B) for radial runout value exceeds the limit, replace alumi-
num wheel.
1. Tire assembly
Refer to GI-4, "
Components" for symbols in the figure.
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Limit
Lateral deflection (A) : Refer to WT-69, "
Road Wheel".
Vertical deflection (B) : Refer to WT-69, "
Road Wheel".
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Revision: 2010 May2011 QX56

WT-66
< REMOVAL AND INSTALLATION >
TRANSMITTER
TRANSMITTER
Exploded ViewINFOID:0000000006225552
Removal and InstallationINFOID:0000000006225553
REMOVAL
1. Deflate tire. Unscrew transmitter retaining nut and allow transmitter to fall into tire.
2. Gently bounce tire so that trans mitter falls to bottom of tire.
Place on tire changing machine and break both tire beads
ensuring that the transmitter remains at the bottom of the tire.
3. Turn tire so that valve hole is at bottom and bounce so that transmitter (1) is near valve hole. Carefully lift tire onto turntable
and position valve hole (and transmitter) 270 degree from
mounting/dismounting head (2).
4. Lubricate tire well and remove first side of the tire. Reach inside the tire and remove the transmitter.
INSTALLATION
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1. Transmitter 2. Grommet seal 3. Valve nut
4. Valve core 5. Cap
Refer to GI-4, "
Components" for symbols in figure.
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Revision: 2010 May2011 QX56

TRANSMITTERWT-67
< REMOVAL AND INSTALLATION >
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1. Put first side of tire onto rim.
2. Mount transmitter on rim and tighten nut. CAUTION:
Speed for tightening nut sh ould be less than 10 rpm.
3. Place wheel on turntable of tire machine. Ensure that transmitter (1) is 270 degree from mounting head (2) when second side of
tire is fitted.
NOTE:
Do not touch transmitter at mounting head.
4. Lubricate tire well and fit second side of tire as normal. Ensure that tire does not rotate relative to rim.
5. Inflate tire and fit to appropriate wheel position.
6. Perform the transmitter wake-up after replacing transmitter. Refer to WT-28, "
Work Procedure".
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Revision: 2010 May2011 QX56