inflation pressure TOYOTA SIENNA 2007 Service Repair Manual

TIRE AND WHEEL – TIRE AND WHEEL SYSTEMTW–3
TW
INSPECTION
1. INSPECT TIRES
(a) Check the tires for wear and proper inflation
pressure.
Cold tire inflation pressure
(b) Using a dial indicator, check the runout of the tires.
Tire runout:
1.4 mm (0.055 in.) or less
2. ROTATE TIRES
HINT:
Rotate the tires as shown in the illustration.
3. INSPECT WHEEL BALANCE (for Steel Wheel)
(a) Check and adjust the off-the-car balance.
Imbalance after adjustment:
8.0 g (0.018 lb.) or less.
HINT:
If necessary, check and adjust the on-the-car
balance.
Tire size
Front kPa (kgf*cm2, psi) Rear kPa (kgf*cm2, psi)
P215/65R16 96T
P225/60R17 98T240 (2.4, 35) 240 (2.4, 35)
C137874
C140312E01
C144019

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–17
TW
3. WHEN TIRE PRESSURE WARNING LIGHT IS LIT
(a) When the tire pressure warning light does not go off,
or when it comes on during driving, check tire
pressure. If the tire pressure warning light comes on
within several hours after adjusting the tire
pressure, the tire may have a slow air leak.
(b) Under the following conditions, the system may not
function properly.
• Facilities or devices that use similar radio
frequencies are located in the vicinity of the
vehicle.
• A radio device of similar frequency is used in the
vehicle.
• A large amount of snow or ice is stuck to the
vehicle, especially onto the wheels and around
the wheel houses.
• The ID of the tire pressure warning valve and
transmitter has not been registered with the
ECU.
• A film or window tint that may interfere with radio
waves is attached on the glass.
• The battery of the sensor has been depleted.
• The tires without tire pressure warning valve and
transmitter are used.
• Tire chains are used.
• The use of non-genuine wheels may result in the
system failure or air-leak.
• Depending on the tire type, the system may not
function properly even though the specified
wheels are used.
(c) After removing and installing the ECU or a sensor,
check for a diagnostic trouble code and verify that it
is a normal code.
4. FUNCTION OF COMPONENTS
5. TIRE PRESSURE WARNING RESET SWITCH
• By operating the tire pressure warning reset switch,
the tire pressure warning ECU can be set to issue a
warning at an inflation pressure that corresponds to
the standard pressure of tires.
Therefore, the dealer must set the warning threshold
to the proper value in order to comply with the local
regulations.
Components Function
Tire pressure warning valve and transmitterCombined as a single unit with a disc wheel air valve, it measures tire pressure and
temperature and transmits an ID number for measurement value and identification.
Built-in the battery.
Tire pressure warning antenna and receiverReceives and transmits a necessary signal from the transmitter to the tire pressure
warning ECU.
Tire pressure warning ECUReceives a signal from the receiver and identifies it as vehicle's own signal. If the
measured value is equal to or lower than the specified value, it transmits a signal so
that the tire pressure warning light on the combination meter comes on.
Tire pressure warning lightLocated in the combination meter, it informs the driver of lowered tire air pressure
and system failure.
Tire pressure warning reset switch Enters the initialization mode for the change of the standard pressure

TW–18TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
• Operate the tire pressure warning reset switch only
after the inflation pressures of all tires have been
adjusted on the vehicle.
• To initialize the system, press and hold the tire
pressure warning reset switch for 3 seconds or longer
with the ignition switch ON. After the initialization
process has started, the warning light blinks 3 times
(1 second on, 1 second off).
• During initialization, the tire pressure warning valve
and transmitter measures the inflation pressure of the
tires, and registers the signals that are transmitted
into the tire pressure warning ECU at a frequency of
once per 3 minutes. The initialization process is
completed when signals from all the tires have been
received. It takes several minutes.

TIRE AND WHEEL – TIRE AND WHEEL SYSTEMTW–3
TW
INSPECTION
1. INSPECT TIRES
(a) Check the tires for wear and proper inflation
pressure.
Cold tire inflation pressure
(b) Using a dial indicator, check the runout of the tires.
Tire runout:
1.4 mm (0.055 in.) or less
2. ROTATE TIRES
HINT:
Rotate the tires as shown in the illustration.
3. INSPECT WHEEL BALANCE (for Steel Wheel)
(a) Check and adjust the off-the-car balance.
Imbalance after adjustment:
8.0 g (0.018 lb.) or less.
HINT:
If necessary, check and adjust the on-the-car
balance.
Tire size
Front kPa (kgf*cm2, psi) Rear kPa (kgf*cm2, psi)
P215/65R16 96T
P225/60R17 98T240 (2.4, 35) 240 (2.4, 35)
C137874
C140312E01
C144019

TW–20TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
NEXT
(a) Refer to PROBLEM SYMPTOMS TABLE (See page TW-
28).
NEXT
(a) Refer to ELECTRONIC CIRCUIT INSPECTION
PROCEDURE (See page IN-30).
NEXT
(a) Repair or replace parts based on the diagnosis result.
NEXT
(a) Check the DATA LIST to confirm that the tire inflation
pressure has been received (See page TW-35).
(b) Perform initialization (See page TW-23).
(c) Confirm that the initialization has been completed.
NEXT Go to step 7
6PROBLEM SYMPTOMS TABLE
7CIRCUIT INSPECTION*
8REPAIR OR REPLACE
9CONFIRMATION TEST
END

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–25
TW
INITIALIZATION
1. DESCRIPTION OF INITIALIZATION
(a) Perform initialization in the following cases:
• Before delivery of a new vehicle.
• After replacement of the tire pressure warning
ECU*.
• After replacement of the tire pressure warning
valve and transmitter.
• Specified tire pressure changes depending on
the size or type of the tire.
*: Perform initialization after the transmitter ID
registration is completed (See page TW-20).
(b) Before initialization
(1) Set the air pressure of all tires to the specified
value.
Cold tire inflation pressure
NOTICE:
Perform the tire pressure adjustment after
the vehicle has sufficiently cooled down. If
the vehicle is not sufficiently cooled down,
increase the air pressure by 20 to 30 kPa (0.2
to 0.3 kgf/cm
2, 2.9 to 4.3 psi) above the
specified value.
Tire Size
kPa (kgf/cm2, psi)
P215/65R16
240 (2.4, 35)
P225/60R17

TW–26TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
2. INITIALIZATION PROCEDURE
(a) Make sure that the ignition switch is off.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Select "TIREPRESS" by following the prompts
displayed on the intelligent tester.
(e) Press the tire pressure warning reset switch within
30 seconds after turning the ignition switch ON.
Keep the tire pressure warning reset switch pressed
for 3 seconds or more with the ignition switch ON.
(f) Check that the tire pressure warning light blinks 3
times (1 second ON, 1 second OFF).
HINT:
Initialization will be completed if signals are received
from all the wheels.
(g) Wait for 5 to 6 minutes with the ignition switch ON.
NOTICE:
• The initialization is normally completed
within 5 to 6 minutes.
• If the initialization has not been completed
successfully, DTC C2177/77 is set after the
vehicle is driven for 20 minutes or more.
• The initialization can be terminated by
connecting terminals TC and CG of the DLC3
connector.
3. CHECK THAT INITIALIZATION HAS BEEN
COMPLETED
(a) Confirm that the data of tire pressure of all tires are
displayed on the intelligent tester screen.
TIRE PRESSURE:
C159182E02
F100115E55
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
TIREPRESS1ID1 tire inflation pressure (Absolute
pressure) /
min.: 100 kPa (1 kgf/cm
2, 14 psi)
max.: 449.35 kPa (4.5 kgf/cm2, 63 psi)Actual tire inflation pressureIf 100 kPa (1 kgf/cm
2, 14 psi) for
absolute pressure is displayed, the
data has not been received.*
TIREPRESS2ID2 tire inflation pressure (Absolute
pressure) /
min.: 100 kPa (1 kgf/cm
2, 14 psi)
max.: 449.35 kPa (4.5 kgf/cm2, 63 psi)Actual tire inflation pressureIf 100 kPa (1 kgf/cm
2, 14 psi) for
absolute pressure is displayed, the
data has not been received.*

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–27
TW
HINT:
*: It may take about 5 to 6 minutes until the values
are displayed. If the values are not displayed after
several minutes, perform troubleshooting according
to the inspection procedure for DTCs C2121/21 to
C2124/24 (See page TW-42).
NOTICE:
The following operations can be used instead of
above procedure:
1. Turn the ignition switch from OFF to ON.
2. Monitor the tire pressure values of all the
wheels using the intelligent tester.
3. If the tire pressure values cannot be
displayed on the intelligent tester screen, the
initialization has failed.
4. It takes about 5 to 6 minutes to display the
tire pressure data.
TIREPRESS3ID3 tire inflation pressure (Absolute
pressure) /
min.: 100 kPa (1 kgf/cm2, 14 psi)
max.: 449.35 kPa (4.5 kgf/cm2, 63 psi)Actual tire inflation pressureIf 100 kPa (1 kgf/cm
2, 14 psi) for
absolute pressure is displayed, the
data has not been received.*
TIREPRESS4ID4 tire inflation pressure (Absolute
pressure) /
min.: 100 kPa (1 kgf/cm
2, 14 psi)
max.: 449.35 kPa (4.5 kgf/cm2, 63 psi)Actual tire inflation pressureIf 100 kPa (1 kgf/cm
2, 14 psi) for
absolute pressure is displayed, the
data has not been received.* Tester Display Measurement Item/Range Normal Condition Diagnostic Note

TW–10TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
TIRE PRESSURE WARNING
SYSTEM
PRECAUTION
1. TIRE PRESSURE WARNING SYSTEM PRECAUTION
(a) When the tire pressure warning light comes on,
immediately check the tire pressure of the tire and
adjust it to the specified value. (The tire pressure
warning light will come on after blinking for 1 minute
if there is an open in the tire pressure warning light
circuit.)
Cold tire inflation pressure
(b) When the tire pressure warning light comes on after
blinking for 1 minute, there is a malfunction in the
system. Check for DTCs.
(c) It is necessary to register the transmitter ID in the
tire pressure warning ECU after replacing the tire
pressure warning valve and transmitter and/or tire
pressure warning ECU (See page TW-20).
(d) When replacing the tire pressure warning ECU:
(1) Using the DATA LIST, read the transmitter IDs
registered in the ECU and make a note of them
before removing the tire pressure warning ECU.
(2) Register the transmitter IDs after installing a new
tire pressure warning ECU.
C159176E01
Tire Size
kPa (kgf/cm2, psi)
215/65R16
240 (2.4, 35)
225/60R17

TW–12TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
2. IN CASE OF TIRE AND WHEEL REPLACEMENT
(a) When tires and wheels are replaced, always ensure
that each transmitter ID is correctly registered.
3. IN CASE OF REPLACEMENT OF TIRE PRESSURE
WARNING ECU, TIRE PRESSURE WARNING VALVE
AND TRANSMITTER, OR TIRE(S) WITH DIFFERENT
TIRE PRESSURE
(a) Initialize the tire pressure warning system after any
of the following is performed:
• Replacing the tire pressure warning ECU or the
tire pressure warning valve and transmitter.
• Installing tire(s) which require different tire
pressure.
• Changing the tire inflation pressure by changing
traveling speed or load weight, etc.
HINT:
The tire pressure warning system will not operate
properly if it is not initialized (See page TW-23).
4. FAIL-SAFE FUNCTION
(a) When a system malfunction occurs in the tire
pressure warning system, the tire pressure warning
light comes on after blinking for 1 minute and
informs the driver of the system failure.
(b) The result of this diagnosis is stored in the tire
pressure warning ECU.
5. CHECK TIRE PRESSURE AFTER REPAIRS
(a) After repairs, confirm that the actual tire pressures
are displayed in DATA LIST (See page TW-35).