New Exercise for the Group

[mcbrue]

Describe how the tire pressure monitor system works. On my 2006 LS430
Ultra model there are no monitoring devices present in the tire valve
stems. There are no monitoring devices evident to the tire guys who
install the tires. If you press and hold the tire pressure monitor
button under the dash, a light comes on and says pressure monitoring
is initializing - you drive it around for a block or so over 19 miles/
hour and the light goes out.

Extra credit - is the spare tire also monitored?

[Ray O]

Post by mcbrue
Describe how the tire pressure monitor system works. On my 2006 LS430
Ultra model there are no monitoring devices present in the tire valve
stems. There are no monitoring devices evident to the tire guys who
install the tires. If you press and hold the tire pressure monitor
button under the dash, a light comes on and says pressure monitoring
is initializing - you drive it around for a block or so over 19 miles/
hour and the light goes out.
Extra credit - is the spare tire also monitored?

There are air pressure sensors built into the valve stems, including the
spare tire.

[Mike Piacente]

How do the sensors transmitted the psi to the computer? Since the stems
rotate, I assume there are no wires? Do they literally transmit using RF?

Post by Ray O

Post by mcbrue
Describe how the tire pressure monitor system works. On my 2006 LS430
Ultra model there are no monitoring devices present in the tire valve
stems. There are no monitoring devices evident to the tire guys who
install the tires. If you press and hold the tire pressure monitor
button under the dash, a light comes on and says pressure monitoring
is initializing - you drive it around for a block or so over 19 miles/
hour and the light goes out.
Extra credit - is the spare tire also monitored?

There are air pressure sensors built into the valve stems, including the
spare tire.
--
Ray O
(correct punctuation to reply)

[Ray O]

Post by Mike Piacente
How do the sensors transmitted the psi to the computer? Since the stems
rotate, I assume there are no wires? Do they literally transmit using RF?

Yes, they transmit using RF.

[greg]

Post by Ray O

Post by mcbrue
Describe how the tire pressure monitor system works. On my 2006 LS430
Ultra model there are no monitoring devices present in the tire valve
stems. There are no monitoring devices evident to the tire guys who
install the tires. If you press and hold the tire pressure monitor
button under the dash, a light comes on and says pressure monitoring
is initializing - you drive it around for a block or so over 19 miles/
hour and the light goes out.
Extra credit - is the spare tire also monitored?

There are air pressure sensors built into the valve stems, including the
spare tire.
--
Ray O
(correct punctuation to reply)

Sorry to disagree, Ray, but I believe the 06 uses the abs wheel speed
sensors; the wheels do not have tire pressure sensors.

Note to McB: this is simply one more reason to sell your LS. Stop
torturing yourself with buyer's remorse and get a car you can actually
enjoy - life is too short.

[Jay Somerset]

Post by greg

Post by Ray O

Post by mcbrue
Describe how the tire pressure monitor system works. On my 2006 LS430
Ultra model there are no monitoring devices present in the tire valve
stems. There are no monitoring devices evident to the tire guys who
install the tires. If you press and hold the tire pressure monitor
button under the dash, a light comes on and says pressure monitoring
is initializing - you drive it around for a block or so over 19 miles/
hour and the light goes out.
Extra credit - is the spare tire also monitored?

There are air pressure sensors built into the valve stems, including the
spare tire.
--
Ray O
(correct punctuation to reply)

Sorry to disagree, Ray, but I believe the 06 uses the abs wheel speed
sensors; the wheels do not have tire pressure sensors.

I thought I understood how this all worked until I read your reply
(immediately above). If I understand you correctly, you are saying
that the tire pressure warning operates with a sensor that detects an
abnormally low tire circumference, rather than directly sensing
pressure. Is this right? (At least with 2006 models?) If so, what
is it triggering off -- sustained differences in apparent wheel speed
between the 4 wheels?

[Jay Somerset]

On Sat, 26 Apr 2008 18:29:25 -0400, Jay Somerset

Post by Jay Somerset

Post by greg

Post by Ray O

Post by mcbrue
Describe how the tire pressure monitor system works. On my 2006 LS430
Ultra model there are no monitoring devices present in the tire valve
stems. There are no monitoring devices evident to the tire guys who
install the tires. If you press and hold the tire pressure monitor
button under the dash, a light comes on and says pressure monitoring
is initializing - you drive it around for a block or so over 19 miles/
hour and the light goes out.
Extra credit - is the spare tire also monitored?

There are air pressure sensors built into the valve stems, including the
spare tire.
--
Ray O
(correct punctuation to reply)

Sorry to disagree, Ray, but I believe the 06 uses the abs wheel speed
sensors; the wheels do not have tire pressure sensors.

I thought I understood how this all worked until I read your reply
(immediately above). If I understand you correctly, you are saying
that the tire pressure warning operates with a sensor that detects an
abnormally low tire circumference, rather than directly sensing
pressure. Is this right? (At least with 2006 models?) If so, what
is it triggering off -- sustained differences in apparent wheel speed
between the 4 wheels?

Being an impatient SOB, I did a Google search on the subject. I don't
know which system the 2006 Lexi use (passive/active), but here is a
TireTrack web page that expalins the two types of monitoring system.

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=44

[greg]

Post by Jay Somerset
On Sat, 26 Apr 2008 18:29:25 -0400, Jay Somerset

Post by Jay Somerset

Post by greg

Post by Ray O

Post by mcbrue
Describe how the tire pressure monitor system works. On my 2006 LS430
Ultra model there are no monitoring devices present in the tire valve
stems. There are no monitoring devices evident to the tire guys who
install the tires. If you press and hold the tire pressure monitor
button under the dash, a light comes on and says pressure monitoring
is initializing - you drive it around for a block or so over 19 miles/
hour and the light goes out.
Extra credit - is the spare tire also monitored?

There are air pressure sensors built into the valve stems, including the
spare tire.
--
Ray O
(correct punctuation to reply)

Sorry to disagree, Ray, but I believe the 06 uses the abs wheel speed
sensors; the wheels do not have tire pressure sensors.

I thought I understood how this all worked until I read your reply
(immediately above).  If I understand you correctly, you are saying
that the tire pressure warning operates with a sensor that detects an
abnormally low tire circumference, rather than directly sensing
pressure.  Is this right?  (At least with 2006 models?)  If so, what
is it triggering off -- sustained differences in apparent wheel speed
between the 4 wheels?

Being an impatient SOB, I did a Google search on the subject.  I don't
know which system the 2006 Lexi use (passive/active), but here is a
TireTrack web page that expalins the two types of monitoring system.
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=44
--
Jay (remove dashes for legal email address)- Hide quoted text -
- Show quoted text -

The '06 LS uses indirect monitoring as described by the tirerack
article. A quick way to tell if any Lexi has direct monitoring is the
presence of a metal valve stem.

[Ray O]

Post by Ray O

Post by mcbrue
Describe how the tire pressure monitor system works. On my 2006 LS430
Ultra model there are no monitoring devices present in the tire valve
stems. There are no monitoring devices evident to the tire guys who
install the tires. If you press and hold the tire pressure monitor
button under the dash, a light comes on and says pressure monitoring
is initializing - you drive it around for a block or so over 19 miles/
hour and the light goes out.
Extra credit - is the spare tire also monitored?

There are air pressure sensors built into the valve stems, including the
spare tire.
--
Ray O
(correct punctuation to reply)

Sorry to disagree, Ray, but I believe the 06 uses the abs wheel speed
sensors; the wheels do not have tire pressure sensors.

**************
I'll take your word for it. I thought that Toyota/Lexus was starting to
move away from indirect to direct tire pressure monitoring.

[GIga]

The newer models use direct measurement (my '08 LS600hL tells you the exact
pressure of each tire - including the spare - on a display that's available
in the dash).

GIga

Post by greg

Post by Ray O

Post by mcbrue
Describe how the tire pressure monitor system works. On my 2006 LS430
Ultra model there are no monitoring devices present in the tire valve
stems. There are no monitoring devices evident to the tire guys who
install the tires. If you press and hold the tire pressure monitor
button under the dash, a light comes on and says pressure monitoring
is initializing - you drive it around for a block or so over 19 miles/
hour and the light goes out.
Extra credit - is the spare tire also monitored?

There are air pressure sensors built into the valve stems, including the
spare tire.
--
Ray O
(correct punctuation to reply)

Sorry to disagree, Ray, but I believe the 06 uses the abs wheel speed
sensors; the wheels do not have tire pressure sensors.
**************
I'll take your word for it. I thought that Toyota/Lexus was starting to
move away from indirect to direct tire pressure monitoring.
--
Ray O
(correct punctuation to reply)