2007 TOYOTA SIENNA ECU

TW–60TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
HINT:
*: 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).
Result
B
A
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
Result Proceed to
Tire pressure values are not displayed. A
All tire pressure readings are equal to specified values. B
END
REPLACE TIRE PRESSURE WARNING ECU (See page TW-87)

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–61
TW
DESCRIPTION
The IDs of each tire pressure warning valve and transmitters are registered to the tire pressure warning
ECU.
When the IDs have never been registered, a DTC is output.
INSPECTION PROCEDURE
NOTICE:
• When replacing the tire pressure warning ECU, read the IDs stored in the ECU using the
intelligent tester and note 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 has been replaced.
(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 REGIT ID CODE by following the prompts
displayed on the intelligent tester.
TIRE PRESSURE:
OK:
The registered transmitter ID codes are displayed
on the intelligent tester screen.
NG
OK
(a) Register the transmitter IDs for all the wheels (See page
TW-20).
DTC C2171/71 Transmitter ID not Registered
DTC No. DTC Detection Condition Trouble Area
C2171/71Transmitter ID code is not registered. (When an ID
code is unregistered for 20 minutes or more)Tire pressure warning ECU
1CONFIRM REGISTRATION CONDITION (REGISTERED ID CODES)
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
REGIT ID1 CODERegistered ID1 code/
min.: 0, max.: FFFFFF*The ID No. registered in the
transmitter ID1 is displayed*: Displayed only when the ID No.
is not registered.
REGIT ID2 CODERegistered ID2 code/
min.: 0, max.: FFFFFF*The ID No. registered in the
transmitter ID2 is displayed*: Displayed only when the ID No.
is not registered.
REGIT ID3 CODERegistered ID3 code/
min.: 0, max.: FFFFFF*The ID No. registered in the
transmitter ID3 is displayed*: Displayed only when the ID No.
is not registered.
REGIT ID4 CODERegistered ID4 code/
min.: 0, max.: FFFFFF*The ID No. registered in the
transmitter ID4 is displayed*: Displayed only when the ID No.
is not registered.
Go to step 2
REPLACE TIRE PRESSURE WARNING ECU (See page TW-87)
2PERFORM REGISTRATION (TRANSMITTER ID)

TW–62TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
NEXT
(a) Perform initialization (See page TW-23).
NEXT
(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.
TIRE PRESSURE:
HINT:
*: 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).
Result
B
A
3PERFORM INITIALIZATION
4READ VALUE ON DATA LIST
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.*
Condition Proceed to
All tire pressure readings are equal to specified values. A
Tire pressure values are not displayed. B
REPLACE TIRE PRESSURE WARNING ECU
(See page TW-87)
END

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–63
TW
DESCRIPTION
The signals 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.
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 has been replaced.
DTC C2176/76 Receiver Error
DTC No. DTC Detection Condition Trouble Area
C2176/76DTC is stored when any of the following is detected:
• Malfunction in the tire pressure warning ECU internal
circuit.
• Terminal RF5V is shorted to ground.
• Malfunction in the tire pressure warning antenna and
receiver internal circuit.• Tire pressure warning antenna and receiver
• Wire harness or connector
• Tire pressure warning ECU
C148709E08

TW–64TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
(a) Disconnect the T15 ECU connector.
(b) Disconnect the T16 receiver connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(a) Reconnect the T15 ECU connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the
table below.
Standard voltage
NG
1CHECK HARNESS AND CONNECTOR (ECU - RECEIVER)
C148708E15
Tester Connection Condition Specified Condition
T15-6 (RF5V) - T16-5
(+5V)
AlwaysBelow 1
T15-12 (RDA) - T16-1
(RDA)
T15-11 (GND2) - T16-4
(GND)
T15-6 (RF5V) - Body
ground
10 k
or higher T15-12 (RDA) - Body
ground
T15-11 (GND2) - Body
ground
REPAIR OR REPLACE HARNESS OR
CONNECTOR
2CHECK TIRE PRESSURE WARNING ECU
C148710E06
Tester Connection Switch Condition Specified Condition
T15-6 (RF5V) - T15-11
(GND2)Ignition switch ON 4.5 to 5.5 V
REPLACE TIRE PRESSURE WARNING ECU
(See page TW-87)

TW–66TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
DESCRIPTION
Initialization is necessary after replacing any of the ECUs, tires with different tire pressure, or tire pressure
warning valve and transmitter, after rotating the tires or when a new vehicle is delivered.
WIRING DIAGRAM
DTC C2177/77 Initialization not Completed
DTC No. DTC Detection Condition Trouble Area
C2177/77Initialization is not completed after vehicle speed of 5
mph (8 km/h) or more continues for 20 minutes or more
(total).• Tire pressure warning valve and transmitter
• Tire pressure warning ECU
• Tire pressure warning antenna and receiver
• Wire harness or connector
B166325E03

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–67
TW
INSPECTION PROCEDURE
NOTICE:
• When replacing the tire pressure warning ECU, read the IDs stored in the old 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:
(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:
1CHECK FREQUENCY RECEIVING CONDITION
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.*

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–69
TW
(a) Disconnect the T15 ECU connector.
(b) Disconnect the T16 receiver connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(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 REGIT ID CODE by following the prompts
displayed on the intelligent tester.
TIRE PRESSURE:
(e) Check the ID number on the identified transmitter by
removing it from the tire and wheel.
3CHECK HARNESS AND CONNECTOR (ECU - RECEIVER)
C148708E15
Tester Connection Condition Specified Condition
T15-12 (RDA) - T16-1
(RDA)
AlwaysBelow 1
T15-11 (GND2) - T16-4
(GND)
T15-6 (RF5V) - T16-5
(+5V)
T15-12 (RDA) - Body
ground
10 k
or higher T15-11 (GND2) - Body
ground
T15-6 (RF5V) - Body
ground
REPAIR OR REPLACE HARNESS OR
CONNECTOR
4INSPECT TIRE PRESSURE WARNING VALVE AND TRANSMITTER
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
REGIT ID1 CODERegistered ID1 code/
min.: 0, max.: FFFFFF*The ID No. registered in the
transmitter ID1 is displayed*: Displayed only when the ID No.
is not registered.
REGIT ID2 CODERegistered ID2 code/
min.: 0, max.: FFFFFF*The ID No. registered in the
transmitter ID2 is displayed*: Displayed only when the ID No.
is not registered.
REGIT ID3 CODERegistered ID3 code/
min.: 0, max.: FFFFFF*The ID No. registered in the
transmitter ID3 is displayed*: Displayed only when the ID No.
is not registered.
REGIT ID4 CODERegistered ID4 code/
min.: 0, max.: FFFFFF*The ID No. registered in the
transmitter ID4 is displayed*: Displayed only when the ID No.
is not registered.