2007 TOYOTA SIENNA ECU

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.

TW–4TIRE AND WHEEL – TIRE AND WHEEL SYSTEM
TW
4. INSPECT WHEEL BALANCE (for Non-steel Wheel)
(a) Check and adjust the off-the-car balance.
Imbalance after adjustment:
8.0 g (0.018 lb.) or less.
NOTICE:
• Use a cleaning detergent to remove dirt, oil
and water from the surface where the balance
weight is to be adhered.
• Do not touch the sticking surface of the tape.
• Adhere the sticking type balance weight to
the flat position shown in the illustration.
• Push the balance weight securely with a
finger to adhere it to the position.
• Do not reuse the balance weight.
HINT:
• The inner side balance weight should be installed
by clipping it to the rim.
• If necessary, check and adjust the on-the-car
balance.
5. INSPECT FRONT AXLE HUB BEARING LOOSENESS
HINT:
See page AH-5.
6. INSPECT REAR AXLE HUB BEARING LOOSENESS
(for 2WD)
HINT:
See page AH-16.
7. INSPECT REAR AXLE HUB BEARING LOOSENESS
(for 4WD)
HINT:
See page AH-19.
8. INSPECT FRONT AXLE HUB RUNOUT
HINT:
See page AH-5.
9. INSPECT REAR AXLE HUB RUNOUT (for 2WD)
HINT:
See page AH-16.
10. INSPECT REAR AXLE HUB RUNOUT (for 4WD)
HINT:
See page AH-19.
C144018E01

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–40TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
DIAGNOSTIC TROUBLE CODE CHART
HINT:
If a trouble code is displayed during the DTC check, inspect
the circuit listed for that code. For details of each code, refer
to the relevant page listed under respective "DTC No." in the
DTC chart.
TIRE PRESSURE WARNING SYSTEM:
DTC Code Detection Item Trouble Area See page
C2111/11 Transmitter ID1 Operation Stop 1. Tire pressure warning valve
and transmitter
2. Tire pressure warning ECUTW-39
C2112/12 Transmitter ID2 Operation Stop 1. Tire pressure warning valve
and transmitter
2. Tire pressure warning ECUTW-39
C2113/13 Transmitter ID3 Operation Stop 1. Tire pressure warning valve
and transmitter
2. Tire pressure warning ECUTW-39
C2114/14 Transmitter ID4 Operation Stop 1. Tire pressure warning valve
and transmitter
2. Tire pressure warning ECUTW-39
C2121/21 No Signal from Transmitter ID1 1. Tire pressure warning valve
and transmitter
2. Tire pressure warning antenna
and receiver
3. Wire harness or connector
4. Tire pressure warning ECUTW-42
C2122/22 No Signal from Transmitter ID2 1. Tire pressure warning valve
and transmitter
2. Tire pressure warning antenna
and receiver
3. Wire harness or connector
4. Tire pressure warning ECUTW-42
C2123/23 No Signal from Transmitter ID3 1. Tire pressure warning valve
and transmitter
2. Tire pressure warning antenna
and receiver
3. Wire harness or connector
4. Tire pressure warning ECUTW-42
C2124/24 No Signal from Transmitter ID4 1. Tire pressure warning valve
and transmitter
2. Tire pressure warning antenna
and receiver
3. Wire harness or connector
4. Tire pressure warning ECUTW-42
C2141/41 Transmitter ID1 Error 1. Tire pressure warning valve
and transmitter
2. Tire pressure warning ECUTW-50
C2142/42 Transmitter ID2 Error 1. Tire pressure warning valve
and transmitter
2. Tire pressure warning ECUTW-50
C2143/43 Transmitter ID3 Error 1. Tire pressure warning valve
and transmitter
2. Tire pressure waning ECUTW-50
C2144/44 Transmitter ID4 Error 1. Tire pressure warning valve
and transmitter
2. Tire pressure warning ECUTW-50
C2165/65 Abnormal Temperature Inside ID1
Tire1. Tires
2. Tire pressure warning valve
and transmitter
3. Tire pressure warning ECUTW-54

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–41
TW
C2166/66 Abnormal Temperature Inside ID2
Tire1. Tires
2. Tire pressure warning valve
and transmitter
3. Tire pressure warning ECUTW-54
C2167/67 Abnormal Temperature Inside ID3
Tire1. Tires
2. Tire pressure warning valve
and transmitter
3. Tire pressure warning ECUTW-54
C2168/68 Abnormal Temperature Inside ID4
Tire1. Tires
2. Tire pressure warning valve
and transmitter
3. Tire pressure warning ECUTW-54
C2171/71 Transmitter ID not Registered Tire pressure warning ECUTW-58
C2176/76 Receiver Error 1. Tire pressure warning antenna
and receiver
2. Wire harness or connector
3. Tire pressure warning ECUTW-60
C2177/77 Initialization not Completed 1. Tire pressure warning valve
and transmitter
2. Tire pressure warning ECU
3. Tire pressure warning antenna
and receiver
4. Wire harness or connectorTW-63
C2181/81 Transmitter ID1 not Received
(Test Mode DTC)1. Tire pressure warning valve
and transmitter
2. Tire pressure warning antenna
and receiver
3. Wire harness or connector
4. Tire pressure warning ECUTW-42
C2182/82 Transmitter ID2 not Received
(Test Mode DTC)1. Tire pressure warning valve
and transmitter
2. Tire pressure warning antenna
and receiver
3. Wire harness or connector
4. Tire pressure warning ECUTW-42
C2183/83 Transmitter ID3 not Received
(Test Mode DTC)1. Tire pressure warning valve
and transmitter
2. Tire pressure warning antenna
and receiver
3. Wire harness or connector
4. Tire pressure warning ECUTW-42
C2184/84 Transmitter ID4 not Received
(Test Mode DTC)1. Tire pressure warning valve
and transmitter
2. Tire pressure warning antenna
and receiver
3. Wire harness or connector
4. Tire pressure warning ECUTW-42
C2191/91 Vehicle Speed Signal Error (Test
Mode DTC)1. Vehicle speed sensor
2. Tire pressure warning ECU
3. Combination meter
4. Wire harness or connectorTW-70 DTC Code Detection Item Trouble Area See page

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

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–11
TW
(e) When replacing the tire pressure warning valve and
transmitter:
(1) Take a note of the 8-digit number (transmitter ID)
written on the new tire pressure warning valve
and transmitter when replacing it. Register the
transmitter IDs in the tire pressure warning ECU
after replacing the tire pressure warning valve
and transmitter and installing the tires and
wheels on the vehicle.
NOTICE:
The transmitter ID is written on the tire
pressure warning valve and transmitter. It
will be unable to be read after installing the
tire pressure warning valve and transmitter
on the tire and wheel. Therefore, take a note
of the transmitter ID before installing the tire
pressure warning valve and transmitter. In
order to register IDs, all 4 IDs for the vehicle
are necessary.
(f) When replacing the tire pressure warning ECU and
the tire pressure warning valves and transmitters, it
is necessary to perform the initialization (See page
TW-23) after the registration (See page TW-20).
(g) Precautions about the tire pressure:
• The tire pressures decrease naturally.
• In winter, tire pressure may decrease due to low
ambient temperatures (tire pressure decreases
by approximately 10 kPa (0.1 kgf/cm
2, 1.45 psi)
for every 10
C (50F) drop in the ambient
temperature). Therefore, the tire pressure
warning is more likely to operate if the tire
pressures are not adjusted appropriately. If the
daily temperature variation is large, pressurize
the tires high so that the tire pressures are
suitable under cold conditions. Incorrect tire
pressure warning operation becomes less likely.
C159177E01

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).