Lexus Supports ASE Certification Page 1 of 13 Title: DIRECT- TYPE TIRE PRESSURE WARNING SYSTEM DIAGNOSTIC TIPS Models: ’04 -- ’08 Applicable Lexus Technical Service Information Bulletin March 20, 2007 PG001-07 The Tire Pressure Warning System (TPWS) monitors the difference in tire pressure in all four or five tires (if the vehicle is equipped with a full-size spare tire) through radio wave signals from a tire pressure valve/sensor mounted in each wheel. This bulletin provides system overview and diagnostic information for the direct-type TPWS. S 2004 -- 2007 model year GX 470 vehicles. S 2006 model year GS 300 vehicles. S 2006 -- 2007 model year GS 430, IS 250/350, and LX 470 vehicles. S 2007 model year ES 350, GS 350, LS 460, RX 350, and SC 430 vehicles. S 2008 model year RX 350 vehicles. REQUIRED EQUIPMENT SUPPLIER PART NUMBER QTY TIS Techstream* NOTE: Version 2.00.008 software or later is required. ADE TSUNT 1 * Essential SST NOTE: The Lexus Diagnostic Tester and CAN Interface Module may also be used to perform the service procedures listed in this bulletin. OP CODE DESCRIPTION TIME OFP T1 T2 N/A Not Applicable to Warranty – – – – PRODUCT GENERAL INFORMATION Introduction Applicable Vehicles Required Tools & Equipment Warranty Information
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Title: DIRECT-TYPE TIRE PRESSURE Technical … · DIRECT-TYPE TIRE PRESSURE WARNING SYSTEM DIAGNOSTIC TIPS-- PG001-07 March 20, 2007 Page 3 of 13 Tire Pressure Warning Valve/Sensor:
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Lexus Supports ASE Certification Page 1 of 13
Title:
DIRECT-TYPE TIRE PRESSUREWARNING SYSTEM DIAGNOSTIC TIPSModels:
’04 -- ’08 Applicable Lexus
Technical ServiceInformation Bulletin
March 20, 2007
PG001-07
The Tire Pressure Warning System (TPWS) monitors the difference in tire pressure inall four or five tires (if the vehicle is equipped with a full-size spare tire) through radiowave signals from a tire pressure valve/sensor mounted in each wheel.
This bulletin provides system overview and diagnostic information for thedirect-type TPWS.
S 2004 -- 2007 model year GX 470 vehicles.S 2006 model year GS 300 vehicles.
S 2006 -- 2007 model year GS 430, IS 250/350, and LX 470 vehicles.
S 2007 model year ES 350, GS 350, LS 460, RX 350, and SC 430 vehicles.
S 2008 model year RX 350 vehicles.
REQUIRED EQUIPMENT SUPPLIER PART NUMBER QTY
TIS Techstream*
NOTE: Version 2.00.008 softwareor later is required.
ADE TSUNT 1
* Essential SST
NOTE:The Lexus Diagnostic Tester and CAN Interface Module may also be used to performthe service procedures listed in this bulletin.
OP CODE DESCRIPTION TIME OFP T1 T2
N/A Not Applicable to Warranty – – – –
PRODUCTGENERALINFORMATION
Introduction
ApplicableVehicles
RequiredTools &
Equipment
WarrantyInformation
DIRECT-TYPE TIRE PRESSURE WARNING SYSTEM DIAGNOSTIC TIPS -- PG001-07 March 20, 2007
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The following illustration is an example of the TPWS component locations on 2007 modelyear RX 350 vehicles:
Tire Pressure Warning Antenna & Receiver
Tire Pressure SensorTire Pressure Sensor
Meter
DLC3
Tire PressureMonitor ECU
Tire Pressure WarningAntenna & Receiver
Tire Pressure Sensor
Tire Pressure Sensor
CAN
BEANBEANGateway
ECU
Tire Pressure WarningReset Switch
Tire Pressure WarningSelect Switch
Tire Pressure Sensor
For exact location of each vehicle’s TPWS components, refer to the Technical InformationSystem (TIS), applicable model and model year Repair Manual, Suspension -- TirePressure Monitoring System (see component or parts location). For additional informationon the TPWS components and operation, refer to TIS, applicable model and model yearNew Car Features.
Summary ofTPWS/
ComponentOperation
DIRECT-TYPE TIRE PRESSURE WARNING SYSTEM DIAGNOSTIC TIPS -- PG001-07 March 20, 2007
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Tire Pressure Warning Valve/Sensor:
Each wheel (including the spare tire on certain vehicles) has a tire pressure warningvalve/sensor integrated into the air valve with a unique ID number that measures the tirepressure and tire temperature and then transmits the information to the antenna/receivermounted inside the vehicle through a radio wave signal. The unique ID number must bemanually entered into the ECU using TIS Techstream whenever the tire pressure warningvalve/sensor is replaced or after a tire and wheel are exchanged.
Vehicles equipped with a tire pressure warning valve/sensor inside the spare tire arelisted in the following table:
MODEL MODEL YEAR
ES 350 (w/Optional Full-size Spare) 2007
GX 470 2004 -- 2007
LS 460 2007
RX 350 2007 -- 2008
Valve Portion
ID Code
Valve/Sensor Position
Air Hole
NutGrommet
Disc WheelRim
NOTE:S All Japan-built vehicles require the tire pressure warning valve/sensors to beactivated (“wake up”) during Pre-Delivery Service (PDS).
S Each tire pressure warning valve/sensor is equipped with a lithium battery that hasan average life span of 10 years.
S If a tire pressure warning valve/sensor is removed from the wheel, the grommetMUST be inspected and replaced if damaged.
Tire Pressure Warning System Antenna/Receiver:
The antenna/receiver receives each tire pressure, tire temperature, and the unique tirepressure warning valve/sensor ID numbers through radio wave signals from the tirepressure warning valve/sensors and then transmits the information to the TPWS ECU.
Summary ofTPWS/
ComponentOperation(Continued)
DIRECT-TYPE TIRE PRESSURE WARNING SYSTEM DIAGNOSTIC TIPS -- PG001-07 March 20, 2007
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Tire Pressure Warning System ECU:
The ECU takes each tire pressure, tire temperature, and unique tire pressure warningvalve/sensor ID information from the antenna/receiver and compares it to the specifiedvalue, which was registered during PDS. If the information received does NOT match thespecified value registered in the ECU, it will transmit a signal to illuminate the TirePressure Warning System Indicator Light located on the combination meter. If the ECU isreplaced, it is necessary to manually enter the tire pressure valve/sensor ID numbersusing TIS Techstream.
Tire Pressure Warning SystemIndicator Light:
The Tire Pressure Warning SystemIndicator Light on the combination meteris illuminated or flashes continuouslywhen the ECU senses that the tirepressure, tire temperature, and/or uniqueID number does NOT match the specifiedvalue registered in the ECU.
Conditions for the Tire Pressure WarningSystem Indicator Light “ON” or “Flashing”are listed in the following table:
CONDITION CAUSE REPAIR
After turning the key ON, theTPWS Indicator Light illuminatesfor 3 seconds and then turns OFF
Normal —“System Check” Normal Condition
TPWS Indicator Light is ON andwill NOT turn OFF
Low tire pressure hasbeen detected
Check that all tire pressures are setto the tire inflation pressure
indicated on the vehicle loadingspecification label
After turning the key ON, theTPWS Indicator Light flashes for1 minute and then turns ONsteady or flashes continuously
System FailureSee the “System Concerns &Repair Methods” sections in
this TSIB
Summary ofTPWS/
ComponentOperation(Continued)
Tire Pressure Warning System Indicator Light
DIRECT-TYPE TIRE PRESSURE WARNING SYSTEM DIAGNOSTIC TIPS -- PG001-07 March 20, 2007
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Initialization/“SET” Switch:
When initializing the TPWS, the present tire pressure is set as the standard pressure (forexample: 32 psi). The TPWS determines a decrease in air pressure by comparing thestandard pressure to the tire inflation pressure received from the tire pressure warningvalve/sensor.
Reasons for initializing the system include:
S When rotating tires that have different tire pressures in the front and rear.
S When changing or adjusting the tire pressure.
S When changing tire size or when tires are replaced.
Initialization/“SET” Switch
“MAIN/2nd” Switch:
The “MAIN/2nd” switch allows the owner to have two different sets of tires and wheels,with two different sets of tire pressure warning valve/sensor ID numbers. For example,the second set would be used for snow tires. Register both the main and the second setof tire pressure warning valve/sensor ID numbers in the TPWS ECU using TISTechstream. Depending on what set of tire pressure warning valve/sensor ID numbersare being registered, the “MAIN/2nd” switch must be set in the correct position (i.e.,“MAIN” for regular use tires and “2nd” for snow use tires).
S “MAIN/2nd” switch in the UP position — The TPWS ECU is programmed to read themain set of tire pressure warning valve/sensor ID numbers.
S “MAIN/2nd” switch in the DOWN position — The TPWS ECU is programmed to readthe second set of tire pressure warning valve/sensor ID numbers.
TPWS “MAIN/2nd” Switch
Summary ofTPWS/
ComponentOperation(Continued)
DIRECT-TYPE TIRE PRESSURE WARNING SYSTEM DIAGNOSTIC TIPS -- PG001-07 March 20, 2007
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When diagnosing the TPWS with TIS Techstream, it must be set up to read the tirepressures in “psi -- gauge” (psi -- g). Follow the screens below from TIS Techstream toconvert the tire pressures to psi -- g.
1. Click Setup > User Preferences > Unit Selection.
2. On the Unit Selection dialog box, verify Air Pressure is set to gauge and psi (see thearea outlined in red in the following screenshot).
3. Click Apply.
TISTechstream
Setup
DIRECT-TYPE TIRE PRESSURE WARNING SYSTEM DIAGNOSTIC TIPS -- PG001-07 March 20, 2007
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COMMON SYMPTOM CAUSE REPAIR SUGGESTIONS
Cannot register the sensor IDnumbers in the ECU usingTIS Techstream
TPWS ECUis initialized.
Jump terminals TC & CG at theDLC3 connector for 30 secondsto reset the TPWS ECU. (LX 470:jump terminals TC & E1 at theDLC1 connector.)
TIS Techstream.“MAIN/2nd” switchis in the incorrectposition.
Ensure correct switch position andmake sure loose objects do notcontact the switch.
HINT:It may be necessary toloosen the valve core toquickly reduce the tirepressure for each tire one ata time.“TIREPRESS” that does NOTchange on TIS TechstreamData List when performingstep 4 is the valve/sensorout of specification or--14 psi--g.
DTC C2111, C2112,C2113, C2114, & C2115
HINT:“TIREPRESS”displays “--14 psi--g”on TIS TechstreamData List
(Continued on next page)
DiagnosticFlow Chart(Continued)
DIRECT-TYPE TIRE PRESSURE WARNING SYSTEM DIAGNOSTIC TIPS -- PG001-07 March 20, 2007
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Is valve/sensor IDnumber correct?NO
YES
Remove tire fromwheel & confirm actual
valve/sensor IDnumbers to numberregistered in ECU
Replace valve/sensor
Register correctvalve/sensorsID number intoECU using
TIS Techstream
Repair Complete1) Adjust tire pressure according to Tireand Loading Information label on driver’sdoor jamb
2) Confirm the actual tire pressure to theTIS Techstream Data List
3) If vehicle is equipped withInitialization/SET switch, initialize systemby pressing & holding “SET” switch untilLow TPWS Light blinks 3 times & thenturns OFF