tire pressure TOYOTA RAV4 2006 Service Repair Manual

TW–4TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
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PARTS LOCATION
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SYSTEM DIAGRAM
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TW–6TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
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SYSTEM DESCRIPTION
1. DESCRIPTION OF SYSTEM
(a) A tire pressure warning antenna and receiver is
equipped with a tire pressure sensor and a
transmitter and is installed in each tire wheel. The
sensor measures the tire pressure and internal
temperature of the tire. Then the measured value
and transmitter ID are transmitted to the tire
pressure monitor receiver on the body as radio
waves, which are sent to the tire pressure warning
ECU. If the transmitter ID has already been
registered, the ECU compares the measured air
pressure value with the standard value. When the
value is less than the standard value registered in
the tire pressure warning ECU, the warning light in
the combination meter turns on.
2. WHEN TIRE PRESSURE WARNING LIGHT IS LIT
(a) When the tire pressure warning light does not turn
off, or when it turns on during driving, check the tire
pressure. If the tire pressure warning light turns on
within several hours after adjusting the tire
pressure, the tire may have a slow air leak.
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(b) Under the following conditions, the system may not
function properly;
• Areas, 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.
• Large amounts of snow or ice are stuck to the
vehicle, especially on the wheels and around the
wheel houses.
• The battery of the transmitter is depleted.
• Tires and wheels without tire pressure warning
valves and transmitters are used.
• Snow tires and tire chains are used.
• If wheels other than the specified ones are used,
the system may not function properly because
different radio waves are transmitted from the tire
pressure warning valve and transmitter.
• Depending on the tire type, the tire pressure
warning valve and transmitter may not function
properly even though the specified wheels are
used.
• The system may not function properly if it is
initialized with tire pressures which are not the
specified values.
(c) The average life of the grommet of the tire pressure
warning antenna and receiver is approximately 5
years, at which time it must be replaced. Retighten
the valve nut if the valve is leaking air, if it is less
than 5 years old, and there is no problem with the
grommets.
(d) After removing and installing the ECU or a sensor,
output a diagnosis code and check that it is a
normal code.
3. FUNCTION OF COMPONENTS
Components Function
Tire pressure warning antenna and receiver • Combined 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
• Battery is built into valve
Tire pressure warning antenna and receiver Receives necessary signals from tire pressure warning antenna and
receiver and transmits them to tire pressure warning ECU
Tire pressure warning ECU • Receives signal from receiver and identifies it as vehicle's own
signal.
• If measurement value is equal to or lower than specified value, it
transmits a signal so that the air pressure warning light on
combination meter turns on.
Tire pressure warning light Located in the combination meter, it informs driver of lowered tire air
pressure and system failure

TW–8TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
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HOW TO PROCEED WITH
TROUBLESHOOTING
HINT:
• Use these procedures to troubleshoot the tire pressure
warning system.
• *: Use the intelligent tester.
NEXT
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery
before proceeding.
NEXT
(a) Check the indicator light (see page TW-17).
NEXT
(a) Check for DTC (see page TW-20).
(b) Clear the DTC (see page TW-20).
(c) Recheck for DTC (see page TW-20).
Result
B
A
(a) Check for tire pressure warning system DTC output (see
page TW-22).
NEXT
1VEHICLE BROUGHT TO WORKSHOP
2INSPECT BATTERY VOLTAGE
3CHECK INDICATOR LIGHT
4CHECK DTC*
Result Proceed to
DTC reoccurs A
DTC does not reoccur B
Go to step 6
5DTC CHART

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–9
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NEXT
Result
B
A
(a) Terminals of ECU (see page TW-16).
(b) DATA LIST/ACTIVE TEST (see page TW-21).
NEXT
NEXT
NEXT
6PROBLEM SYMPTOM CONFIRMATION
7PROBLEM SYMPTOMS TABLE
Result Proceed to
Fault is not listed in problem symptoms
tableA
Fault is listed in problem symptoms
tableB
Go to step 9
8OVERALL ANALYSIS AND TROUBLESHOOTING*
9REPAIR OR REPLACE
10CONFIRMATION TEST
END

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REGISTRATION
1. IN CASE OF TIRE PRESSURE WARNING ECU
REPLACEMENT
(a) Read ID stored in the old ECU using the intelligent
tester.
2. IN CASE OF TIRE PRESSURE WARNING VALVE AND
TRANSMITTER AND/OR TIRE PRESSURE WARNING
ECU REPLACEMENT
(a) Read the ID written on the tire pressure monitor
valve.
3. REGISTER TRANSMITTER ID
NOTICE:
It is necessary to register the transmitter ID in the
tire pressure warning ECU when replacing the tire
pressure warning valve and transmitter and/or tire
pressure warning ECU.
(a) Prepare all of the transmitter ID data before starting
registration.
HINT:
• Read the registered transmitter IDs that are
stored in the ECU using the intelligent tester and
make a note of them.
• If reading stored transmitter IDs is impossible
due to malfunctions of components such as the
tire pressure warning antenna and receiver,
remove the tires from the wheels and check the
IDs located on the tire pressure warning valves
and transmitters (see page TW-60).
• When replacing the tire pressure warning valves
and transmitters, make a note of the IDs written
on the tire pressure warning valves and
transmitters.
(b) Connect the intelligent tester (with CAN VIM) to the
DLC3.
(c) Turn the ignition switch ON.
(d) *1: Read and write down the ID (ID1 to ID5) by
using the DATA LIST.
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(e) *2: Select REGIST TIRE SET following the
intelligent tester screen (UTILITY - REGIST TIRE
SET).
(f) *3: Select the registration mode "MAIN".
(g) Input the ID (ID1 to ID5) using the intelligent tester
and transmit it to the tire pressure warning ECU.
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(h) Set the ID transmission condition to "ID Registration
is complete".
HINT:
• The previously registered IDs will be deleted
from the memory when the registration is
completed.
• If the operations of *1 to *3 are not completed
within 5 minutes, the mode will return to normal
operation mode.
4. CONFIRMATION OF TRANSMITTER ID
REGISTRATION
(a) Set the tire pressure of all wheels (including the
spare tire) to the specified value.
Standard pressure:
220 kPa (2.2 kgf/cm
2, 32 psi)
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(b) Connect the intelligent tester (with CAN VIM ) to the
DLC3.
(c) Turn the ignition switch ON.
(d) Select "SIGNAL CHECK" mode on the intelligent
tester (with CAN VIM ) (see page TW-12).
(e) Confirm that the transmitter IDs and tire pressure
data for all the tires are displayed on the intelligent
tester screen.
NOTICE:
• It may take up to 1 minute to update the tire
pressure data.
• If the IDs have not been registered, DTC
C2171/71 is set in the tire pressure warning
ECU after approximately 60 minutes.