title: direct-type tire pressure technical … · direct-type tire pressure warning system...

Lexus Supports ASE Certification 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


CAN

BEANBEANGateway

ECU

Tire Pressure WarningReset Switch

Tire Pressure WarningSelect Switch


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


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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)


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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/


Tire Pressure Warning System Indicator Light


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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/



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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


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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.

Cannot complete Pre-DeliveryService (PDS) activation “wakeup” procedure.

NOTE: Vehicles built in NorthAmerica come with the transmittersensors already activated

Tire/wheel swappedprior to deliveryto customer.

1)Record all sensor ID numbersfrom TIS Techstream Data List.

2)Break down tires and comparethe sensor ID numbers to what isrecorded in the TPWS ECU.

3)If incorrect, register the correctsensor ID numbers usingTIS Techstream.

sensors already activated(awake). Vehicles built in Japanrequire the transmitter sensorsto be activated during PDS.

DTCs:

C2111

Sensor ID numbersare not registered.

1)Break down tires and record allsensor ID numbers.

2)Register the sensor ID numbersin the TPWS ECU usingTIS Techstream.

C2111C2112C2113C2114C2115

Transmitters arenot activated(in sleep mode).

1)Tire pressure decrease is notfast enough.

2)Loosen the valve core whenreleasing air pressure from thetire to activate (“wake up”)the sensor (6 psi-g within30 seconds).

One or more tire pressuresdisplay “--14 psi-g” & “--40_F” onTIS Techstream Data List.

DTCs:

C2121C2122

1)Sensor ID numbersare not registered.

2)Tire/wheel swappedprior to deliveryto customer.

1)Record all sensor ID numbersfrom TIS Techstream Data List.

2)Break down tires and comparethe sensor ID numbers to what isrecorded in the TPWS ECU.

3)If incorrect, register the correctsensor ID numbers usingTIS Techstream.C2122

C2123C2124C2125C2177

TPWS ECU orantenna/receivermalfunction.

Refer to the diagnostic procedurefor checking the TPWS ECU and/orantenna/receiver located in theapplicable Repair Manual on TIS.C2177

Transmitters areinoperative. Replace sensors.

SystemConcerns &

Repair Methods


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COMMON SYMPTOM CAUSE REPAIR SUGGESTIONS

One or more tire pressures dis-play “--14 psi-g” & “--40_F” on TISTechstream Data List.

C2131C2132C2133C2134C2135C2177

“MAIN/2nd” switch is inthe incorrect position.

Check position of “MAIN/2nd”switch. (“MAIN” for the main set oftires and “2nd” for second set oftire pressure warning valve/sensorID numbers.)

Tire pressure reads higherthan actual vehicle loadinglabel specification.

Initialization isincorrect orincomplete.

Adjust and set tire pressuresaccording to the vehicle loadinglabel specification. (Label is insidethe driver’s door jamb.)

TIS Techstream Registration of Tire Pressure Warning Valve/sensor ID Numbers:

1. Click Connect to Vehicle (refer to “1” in the following screenshot).

2. Adjust vehicle information as necessary (refer to “2” and the area outlined in red inthe following screenshot).

3. Click Next (refer to “3” in the following screenshot).

1

2

3

SystemConcerns &

Repair Methods(Continued)

RegistrationProcedure


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4. Select Tire Pressure Monitor (A) > Utility (B) > ID Registration (C) (refer to thefollowing screenshots).

A

C

B

RegistrationProcedure(Continued)


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5. Follow the onscreen utility instructions (refer to the following screen shots).

A B C

E

E1

FD

NOTE:Repeat E and E1 for theremaining ID numbers.

RegistrationProcedure(Continued)


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Low Tire PressureWarning Light is ON

Check position of“MAIN/2nd” switch

What position isthe “MAIN/2nd”

switch in?

Do one or moretires have

damage causingan air leak?

YES

“2nd”

YES

Return switch to“MAIN” position &explain to customerpurpose of“MAIN/2nd” switch

Fix or replace tire(s)

“MAIN”

1) Adjust tire pressureaccording to Tireand LoadingInformation labelon driver’sdoor jamb

2) Check that LowTPWS Light goesOFF after 5 minutesof key ON andengine OFF.

NO

Using a tire pressuregauge, check ALL tirepressures (includingthe spare if equipped)with a full-size spare

Is the tirepressure low?

NO

Did Low TPWSLight turn OFF?

NO

YES

Repair Complete

(Continued on next page)

DiagnosticFlow Chart


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Use TISTechstream tocheck for stored

DTCs

Which DTCsare stored?

1) From TPWS Diagnostic Menu,select “ALL” Data List

2) Display “ALL TIREPRESS”3) Decrease air pressure fromvalve core

HINT:“TIREPRESS” that does NOTchange on TIS TechstreamData List when performingstep 3 is the valve/sensorout of specification or --14 psi--g.

4) Repeat step 3 for each tire oneat a time

5) From TIS Techstream DataList, write down “TIREPRESS”data valve/sensor ID numberthat corresponds to each tire

DTC C2121, C2123,C2124, C2125, C2131,C2132, C2133, C2134,C2135, C2177

(Continued from previous page)

Other DTCsNO DTCs

HINT:“TIREPRESS”displays “--14 psi--g”on TIS TechstreamData List

Follow DiagnosticProcedure inRepair Manual

Confirm actual tirepressure to

TIS TechstreamData List

Are all tire pressuresdisplayed on TIS

Techstream Data Listwithin factoryspecification?

1) From TPWS DiagnosticMenu, select “ALL” Data List

2) Display “ALL TIREPRESS”3) Increase tire pressure to44 psi

4) Remove the air pressure by6 psi for 30 seconds

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)


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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

YES

Are all tire pressuresdisplayed on TIS

Techstream Data Listwithin factoryspecification?

(Continued from previous page)

NO

DiagnosticFlow Chart(Continued)

title: direct-type tire pressure technical … · direct-type tire pressure warning system...

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