TOYOTA SIENNA 2007 Service Repair Manual

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–37
TW
DTC CHECK / CLEAR
1. DTC CHECK (USING SST CHECK WIRE)
(a) Check DTCs.
(1) Turn the ignition switch off.
(2) Using SST, connect terminals TC and CG of
DLC3.
SST 09843-18040
(3) Turn the ignition switch to the ON position.
(4) Read and record any DTCs from the tire
pressure warning light on the combination meter.
Refer to the illustration as examples of a normal
system code and codes 13 and 33.
HINT:
• If the tire pressure warning light does not
indicate any DTCs or the normal system
code, inspect the tire pressure warning light
circuit or TC and CG terminal circuit.
• If 2 or more malfunctions are indicated at the
same time, the lowest numbered DTC is
displayed first.
(5) Refer to the Diagnostic Trouble Code Chart (See
page TW-37) for DTC information.
(6) After completing the check, turn the ignition
switch off and remove SST from DLC3.
SST 09843-18040
2. DTC CHECK (USING INTELLIGENT TESTER)
(a) Check DTCs.
(1) Make sure that the ignition switch is off.
(2) Connect the intelligent tester to the DLC3.
(3) Turn the ignition switch to the ON position.
(4) Read the DTCs following the prompts on the
tester screen.
HINT:
Refer to the intelligent tester operator's manual
for further details.
(b) Clear the DTCs.
HINT:
After repairing the malfunctions, clear the DTCs.
(1) Make sure that the ignition switch is off.
(2) Connect the intelligent tester to DLC3.
(3) Turn the ignition switch to the ON position.
(4) Clear the DTCs following the prompts on the
tester screen.
HINT:
Refer to the intelligent tester operator's manual
for further details.
C159183E02
Trouble Area See page
Tire pressure warning light circuitTW-74
TC and CG terminal circuitTW-79

TW–38TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the intelligent tester to read the DATA LIST allows
the values or states of switches, sensor, actuators and
other items to be read without removing any parts. This
non-intrusive inspection can be very useful because
intermittent conditions or signals may be discovered
before parts or wiring is disturbed. Reading the DATA
LIST information early in troubleshooting is one way to
save diagnostic time.
NOTICE:
In the table below, the values listed under "Normal
Condition" are reference values. Do not depend
solely on these reference values when deciding
whether a part is faulty or not.
(a) Make sure that the ignition switch is off.
(b) Connect the intelligent tester to DLC3.
(c) Turn the ignition switch to the ON position.
(d) Following the display on the intelligent tester, read
"DATA LIST".
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
MODE STATUSTire pressure warning system mode/NORMAL
or REG 2nd or REG M or TESTNORMAL: Normal mode
TEST: Test mode-
MAIN TIRENumber of main tire ID to be registered/0, 1, 2,
3, 40 to 4 should be displayed -
VEHICLE SPDVehicle speed reading/min.: 0 km/h (0 mph),
max.: 255 km/h (158 mph)Actual vehicle speedSpeed indicated on the
combination meter
REGIT ID1 CODE
Registered ID1 code/min.: 0, max.: FFFFFFF
*1The ID No. registered in the
transmitter ID1 is displayed-
REGIT ID2 CODE
Registered ID2 code/min.: 0, max.: FFFFFFF
*1The ID No. registered in the
transmitter ID2 is displayed-
REGIT ID3 CODE
Registered ID3 code/min.: 0, max.: FFFFFFF
*1The ID No. registered in the
transmitter ID3 is displayed-
REGIT ID4 CODE
Registered ID4 code/min.: 0, max.: FFFFFFF
*1The ID No. registered in the
transmitter ID4 is displayed-
TRANS STATUS ID code transmission status/FINISH or NOW FINISH or NOW -
INITIAL SW Tire pressure warning reset switch/ON, OFFON: Switch on
OFF: Switch off-
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.
*2
TIREPRESS2ID2 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.
*2
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.
*2
TIREPRESS4ID4 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.
*2

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–39
TW
HINT:
*1: Displayed only when the ID No. is not registered.
*2: It may take about 5 to 6 minutes until the values
are displayed. If the values are not displayed after a
few minutes, perform troubleshooting according to
the inspection procedure for DTCs C2121/21 to
C2124/24 (See page TW-42).
METER:
2. ACTIVE TEST
Using the intelligent tester to perform ACTIVE TEST
allows the meters, indicators and other items to be
operated without removing any parts. Performing
ACTIVE TEST early in troubleshooting is one way to
save diagnostic time. It is possible to display the DATA
LIST on the intelligent tester during ACTIVE TEST.
(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) Enter the following menus: DIAGNOSIS / OBD/
MOBD / METER / ACTIVE TEST.
METER:
TIRE TEMP1ID1 temperature in tire/min.: -50C (-58F),
max.: 205
C (401F)Actual tire temperatureIf -50
C (-58F) is displayed,
data has not been received.
TIRE TEMP2ID2 temperature in tire/min.: -50
C (-58F),
max.: 205
C (401F)Actual tire temperatureIf -50
C (-58F) is displayed,
data has not been received.
TIRE TEMP3ID3 temperature in tire/min.: -50
C (-58F),
max.: 205
C (401F)Actual tire temperatureIf -50
C (-58F) is displayed,
data has not been received.
TIRE TEMP4ID4 temperature in tire/min.: -50
C (-58F),
max.: 205
C (401F)Actual tire temperatureIf -50
C (-58F) is displayed,
data has not been received.
BATT VOLT1 ID1 battery voltage/OVER or LESS OVER -
BATT VOLT2 ID2 battery voltage/OVER or LESS OVER -
BATT VOLT3 ID3 battery voltage/OVER or LESS OVER -
BATT VOLT4 ID4 battery voltage/OVER or LESS OVER -
INITIAL SW INFOTire pressure warning reset switch setting
information/WITH or WITHOUTWITH or WITHOUT -
INIT THRESHOLD1ID1 initial threshold of low-pressure/min.: 0 kPa
(0 kgf/cm
2, 0 psi), max.: 637.5 kPa (6.4 kgf/cm2,
93 psi)Tire pressure after initialization -
INIT THRESHOLD2ID2 initial threshold of low-pressure/min.: 0 kPa
(0 kgf/cm
2, 0 psi), max.: 637.5 kPa (6.4 kgf/cm2,
93 psi)Tire pressure after initialization -
INIT THRESHOLD3ID3 initial threshold of low-pressure/min.: 0 kPa
(0 kgf/cm
2, 0 psi), max.: 637.5 kPa (6.4 kgf/cm2,
93 psi)Tire pressure after initialization -
INIT THRESHOLD4ID4 initial threshold of low-pressure/min.: 0 kPa
(0 kgf/cm
2, 0 psi), max.: 637.5 kPa (6.4 kgf/cm2,
93 psi)Tire pressure after initialization -
# CODES Number of DTCs recorded/min.: 0, max.: 255 Min.: 0, Max.: - - Tester Display Measurement Item/Range Normal Condition Diagnostic Note
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
SPEED METERVehicle speed/Min.: 0 km/h (0 mph), Max.: 255
km/h (158 mph)Almost same as actual vehicle speed
(When driving)-
Tester Display Test Part Control Range Diagnostic Note
TIRE PRESS WARN Tire Pressure Warning LightTire Pressure Warning Light is
OFF/ONConfirm that the vehicle is
stopped with the engine idling

TW–42TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
DESCRIPTION
The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies
measure the air pressures of the tires. The measured values are transmitted to the tire pressure warning
antenna and receiver on the body as radio waves and then sent to the tire pressure warning ECU. The
ECU compares the measured air pressure values with the air pressure threshold. When the measured air
pressure value is less than this threshold, the warning light in the combination meter comes on. The tire
pressure warning ECU stores a DTC when the tire pressure warning valve and transmitter stops
transmitting signals. At this time, forcibly transmit the signals by releasing the tire pressure rapidly. The
stored DTC is cleared when the signal transmission is resumed.
HINT:
It is necessary to perform the procedure to identify the tire pressure warning valve and transmitter that is
malfunctioning because it cannot be identified by the output DTC.
INSPECTION PROCEDURE
NOTICE:
It is necessary to perform initialization (See page TW-23) after registration (See page TW-20) of the
transmitter IDs into the tire pressure warning ECU after the ECU and/or valve and transmitter have
been replaced.
(a) Set the tire pressure to the specified value.
Cold tire inflation pressure
(b) Make sure that the ignition switch is off.
(c) Connect the intelligent tester to the DLC3.
(d) Turn the ignition switch to the ON position and turn the
tester on.
DTC C2111/11 Transmitter ID1 Operation Stop
DTC C2112/12 Transmitter ID2 Operation Stop
DTC C2113/13 Transmitter ID3 Operation Stop
DTC C2114/14 Transmitter ID4 Operation Stop
DTC No. DTC Detection Condition Trouble Area
C 2 111 / 11
C2112/12
C2113/13
C2114/14Tire pressure warning valve and transmitters stop
transmitting signals• Tire pressure warning valve and transmitter
• Tire pressure warning ECU
1PERFORM FORCED TRANSMISSION OF TRANSMITTER ID OF ALL WHEELS
Tire Size
kPa (kgf/cm2, psi)
P215/65R16
240 (2.4, 35)
P225/60R17

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–43
TW
(e) Select "TIREPRESS" by following the prompts displayed
on the intelligent tester.
TIRE PRESSURE:
HINT:
*: It may take about 5 to 6 minutes until the values are
displayed. If the values are not displayed after about 5 to
6 minutes, perform troubleshooting according to the
inspection procedure for DTCs C2121/21 to C2124/24
(See page TW-42).
(f) Rapidly release the pressures from each wheel by
approximately 40 kPa (0.4 kgf/cm
2, 5.8 psi) within 30
seconds.
(1) Check that each tire pressure data displayed on the
intelligent tester screen has changed.
OK:
Each tire pressure data displayed on the
intelligent tester screen will change to the
value of the tire pressure.
NOTICE:
• It takes about 5 to 6 minutes to display the
updated tire pressure data.
• When the "TIREPRESS" data has not
changed, reset the tire pressure to the
appropriate specified value and rotate the tire
90 to 270 degrees (including the spare tire).
Then rapidly release the tire pressure and
recheck it.
(2) After confirming that all of the tire pressure data
displayed on the intelligent tester screen have
changed, set the tire pressure to the appropriate
specified values.
HINT:
If the tire pressure data displayed on the intelligent
tester screen has not changed after rechecking, go
to other problem procedure (for malfunction in
transmission or reception function (See page TW-
42)).
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.*
TIREPRESS3ID3 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.*
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.*

TW–44TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
NG
OKINSPECT OTHER PROBLEM
(MALFUNCTION IN TRANSMISSION OR
RECEPTION FUNCTION)
END

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–45
TW
DESCRIPTION
The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies
measure the air pressure of the tires. The measured values are transmitted to the tire pressure warning
antenna and receiver on the body as radio waves and then sent to the tire pressure warning ECU. The
ECU compares the measured air pressure values with the air pressure threshold. When the measured air
pressure value is less than this threshold, the warning light in the combination meter comes on.
The tire pressure warning valve and transmitters constantly send radio waves to the tire pressure warning
antenna and receiver.
Under the following conditions below, the tire pressure warning antenna and receiver is unable to receive
the signals from the tire pressure warning valves and transmitters, and a DTC is stored.
• Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.
• Devices using similar radio frequencies are used in the vehicle.
• The goods which obstruct the radio signal of the valve and transmitter, for example, tire chain or
window film.
HINT:
When no signals are received for 20 minutes or more, a DTC is output.
DTCs from C2121/21 to C2124/24 can only be cleared by using the tester. DTCs from C2181/81 to
C2184/84 can be cleared when the transmitter in the tire pressure warning valve and transmitter sends a
forced transmission signal or test mode ends. DTCs from C2181/81 to C2184/84 are output only in test
mode.
HINT:
It is necessary to perform the procedure to identify the tire pressure warning valve and transmitter that is
malfunctioning because it cannot be identified by the output DTC.
DTC C2121/21 No Signal from Transmitter ID1
DTC C2122/22 No Signal from Transmitter ID2
DTC C2123/23 No Signal from Transmitter ID3
DTC C2124/24 No Signal from Transmitter ID4
DTC C2181/81 Transmitter ID1 not Received (Test Mode DTC)
DTC C2182/82 Transmitter ID2 not Received (Test Mode DTC)
DTC C2183/83 Transmitter ID3 not Received (Test Mode DTC)
DTC C2184/84 Transmitter ID4 not Received (Test Mode DTC)
DTC No. DTC Detection Condition Trouble Area
C2121/21
C2122/22
C2123/23
C2124/24These DTCs are detected when no signals are received
for 20 minute drive or more.• Tire pressure warning valve and transmitter
• Tire pressure warning antenna and receiver
• Wire harness or connector
• Tire pressure warning ECU
C2181/81
C2182/82
C2183/83
C2184/84Malfunction in the transmitting/receiving circuit• Tire pressure warning valve and transmitter
• Tire pressure warning antenna and receiver
• Wire harness or connector
• Tire pressure warning ECU

TW–46TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
• When replacing the tire pressure warning ECU, read the IDs stored in the ECU using the
intelligent tester and write them down before removal.
• It is necessary to perform initialization (See page TW-23) after registration (See page TW-20) of
the transmitter IDs into the tire pressure warning ECU after the ECU and/or valve and
transmitter have been replaced.
(a) Check if the vehicle is not located in areas such as
described below:
1CHECK FREQUENCY RECEIVING CONDITION
B166325E02

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–47
TW
(1) Facilities or devices that use similar radio
frequencies are located in the vicinity of the vehicle.
HINT:
If the vehicle is located in areas described above,
the tire pressure warning light may come on after
blinking 1 minute only in a particular area.
(2) Devices using similar radio frequencies are used in
the vehicle.
OK:
Facilities, or devices that use similar radio
frequencies are not located in the vicinity of
the vehicle.
HINT:
Radio frequency may be interrupted due to
surroundings or devices installed by the user.
NG
OK
(a) Set the tire pressure to the appropriate specified values.
Cold tire inflation pressure
(b) Make sure that the ignition switch is off.
(c) Connect the intelligent tester to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Select "TIREPRESS" by following the prompts displayed
on the intelligent tester.
TIRE PRESSURE:
HINT:
*: It may take about 5 to 6 minutes until the values are
displayed.CHECK IF ANY DEVICE IS INSTALLED BY
USER
2IDENTIFY TRANSMITTER CORRESPONDING TO DTC
Tire Size
kPa (kgf/cm2, psi)
P215/65R16
240 (2.4, 35)
P225/60R17
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.*
TIREPRESS3ID3 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.*
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.*

TW–48TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
(f) Rapidly reduce the tire pressure for each wheel at least
40 kPa (0.41 kg/cm
2, 5.8 psi) within 30 seconds.
(g) Check the DATA LIST.
NOTICE:
• It takes about 5 to 6 minutes to display the
updated tire pressure data.
• When no "TIREPRESS" data has changed, reset
the tire pressure to the appropriate specified
value and rotate the tire 90 to 270 degrees. Then
rapidly release the tire pressure and recheck it.
• Record the transmitter ID of which "TIREPRESS"
data corresponds to each tire.
(h) After confirming that one of "TIREPRESS" data for one
tire (ID1 to ID4) has changed, repeat this procedure one
by one. Identify the transmitter that corresponds to DTC.
Result
A
B
C
Result Proceed to
One or more of transmitters abnormal A
All normal B
All abnormal C
Go to step 4
END