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  #1 (permalink)  
Old 02 Apr 2010, 08:04 pm
JRStern
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Default tpms light came on

How smart is the light, and how smart is the dealer?

(don't even ask how smart is the driver ok)

New Accord EX4 sedan about four months out of the dealer, haven't done
a thing yet but put gas in it and putter around town. Noticed the
TPMS light on, pulled over to look at the tires. Nothing obvious, so
I drove on. Next time, I looked carefully, maybe the right front was
a tad low?

Drove on down to the service station air pump, promised to buy some
gas if they'd turn on the coin-op air. Turns out that, warm, all four
tires were almost exactly 28psi. But my door panel suggests they
should be 32psi cold. Harump. I know my dealer has long had a habit
of underinflating when they adjust tires, why, I don't know. And I've
beem wondering why my MPG was a mile or two lower than on previous
Accords. Harump. So I blew them all up to about 32psi warm. Turned
the key, drove a block - light stayed on. Maybe a bad sensor, huh?

Had lunch, got back in - and now the light was off.

So, does it take a couple of samples to convince itself that the
pressure is OK? How the heck does the sensor work anyway?

Just wondering.

J.

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  #2 (permalink)  
Old 02 Apr 2010, 08:25 pm
JRE
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Default Re: tpms light came on

JRStern wrote:
> How smart is the light, and how smart is the dealer?
>
> (don't even ask how smart is the driver ok)
>
> New Accord EX4 sedan about four months out of the dealer, haven't done
> a thing yet but put gas in it and putter around town. Noticed the
> TPMS light on, pulled over to look at the tires. Nothing obvious, so
> I drove on. Next time, I looked carefully, maybe the right front was
> a tad low?
>
> Drove on down to the service station air pump, promised to buy some
> gas if they'd turn on the coin-op air. Turns out that, warm, all four
> tires were almost exactly 28psi. But my door panel suggests they
> should be 32psi cold. Harump. I know my dealer has long had a habit
> of underinflating when they adjust tires, why, I don't know. And I've
> beem wondering why my MPG was a mile or two lower than on previous
> Accords. Harump. So I blew them all up to about 32psi warm. Turned
> the key, drove a block - light stayed on. Maybe a bad sensor, huh?
>
> Had lunch, got back in - and now the light was off.
>
> So, does it take a couple of samples to convince itself that the
> pressure is OK? How the heck does the sensor work anyway?
>
> Just wondering.
>
> J.
>


Did you check the pressure of the spare?

--
JRE
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  #3 (permalink)  
Old 02 Apr 2010, 10:39 pm
Elmo P. Shagnasty
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Default Re: tpms light came on

In article <pm4dr55kigf2sotd6c7h20ki6el6e0lblm@4ax.com>,
JRStern <JRStern@foobar.invalid> wrote:

> New Accord EX4 sedan about four months out of the dealer, haven't done
> a thing yet but put gas in it and putter around town. Noticed the
> TPMS light on, pulled over to look at the tires. Nothing obvious, so
> I drove on. Next time, I looked carefully, maybe the right front was
> a tad low?


Didja ever READ the OWNER'S MANUAL about that little light?

And no, your eyeball is NOT an air pressure gauge.


> So, does it take a couple of samples to convince itself that the
> pressure is OK? How the heck does the sensor work anyway?


Oh, I dunno. What does your OWNER'S MANUAL for your SHINY NEW $25,000
TOY say?
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  #4 (permalink)  
Old 03 Apr 2010, 03:51 pm
Curly@home.ca
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Default Re: tpms light came on

My TPMS light will come on occasionally on my 08 EXL V6 when the temperature
drops to -35 or -40 and once it warms up to a balmy -20 the light goes out.
I was thinking of having nitration put in and see if that would make a
difference.
just a thought

Cheers
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  #5 (permalink)  
Old 03 Apr 2010, 05:52 pm
JRStern
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Default Re: tpms light came on

On Sat, 3 Apr 2010 20:51:36 GMT, Curly@home.ca wrote:

>My TPMS light will come on occasionally on my 08 EXL V6 when the temperature
>drops to -35 or -40 and once it warms up to a balmy -20 the light goes out.
>I was thinking of having nitration put in and see if that would make a
>difference.
>just a thought
>
>Cheers


Er, yeah. Well, out here in Los Angeles, I suppose when the Richter
8.0 hits it's likely to cause the TPMS light to come on, too. I'll let
you know.

J.

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  #6 (permalink)  
Old 03 Apr 2010, 05:57 pm
JRStern
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Posts: n/a
Default Re: tpms light came on

On Fri, 02 Apr 2010 22:39:06 -0500, "Elmo P. Shagnasty"
<elmop@nastydesigns.com> wrote:

>In article <pm4dr55kigf2sotd6c7h20ki6el6e0lblm@4ax.com>,
> JRStern <JRStern@foobar.invalid> wrote:
>
>> New Accord EX4 sedan about four months out of the dealer, haven't done
>> a thing yet but put gas in it and putter around town. Noticed the
>> TPMS light on, pulled over to look at the tires. Nothing obvious, so
>> I drove on. Next time, I looked carefully, maybe the right front was
>> a tad low?

>
>Didja ever READ the OWNER'S MANUAL about that little light?
>
>And no, your eyeball is NOT an air pressure gauge.


Speak for yourself.

>> So, does it take a couple of samples to convince itself that the
>> pressure is OK? How the heck does the sensor work anyway?

>
>Oh, I dunno. What does your OWNER'S MANUAL for your SHINY NEW $25,000
>TOY say?


You're not going to fool me like that, I know how that worked out at
the end of Raiders of the Lost Ark!

OK, I understand there's some federal mandate that we have these
things, and I guess they work by emitting deadly radiation and
reporting my whereabouts to the FBI at every moment. Just as in five
years, we'll have the same devices rammed up our asses for Obamacare.

But I was just wondering (a) why the light didn't go out right away,
that is still lit up the next time I started and drove a few feet, and
(b) why my dealer doesn't ever open up the users manual or read the
plaque inside the driver's door giving recommended pressures.

... and I'll see if I get back that 1-2mpg now that the pressure is up
where it ought to be.

J.

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  #7 (permalink)  
Old 03 Apr 2010, 07:53 pm
Elmo P. Shagnasty
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Default Re: tpms light came on

In article <2lhfr59deib236ant8qr56cma5p7ejso5p@4ax.com>,
JRStern <JRStern@foobar.invalid> wrote:

> >And no, your eyeball is NOT an air pressure gauge.

>
> Speak for yourself.


So your eyeball can tell the difference between 35psi and 32psi?

SURE it can. <snort>
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  #8 (permalink)  
Old 03 Apr 2010, 07:55 pm
Elmo P. Shagnasty
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Posts: n/a
Default Re: tpms light came on

In article <2lhfr59deib236ant8qr56cma5p7ejso5p@4ax.com>,
JRStern <JRStern@foobar.invalid> wrote:

> But I was just wondering (a) why the light didn't go out right away,
> that is still lit up the next time I started and drove a few feet


hmmmmm, what does your OWNER'S MANUAL say?



> and
> (b) why my dealer doesn't ever open up the users manual or read the
> plaque inside the driver's door giving recommended pressures.


Excellent question. Ask him.
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  #9 (permalink)  
Old 03 Apr 2010, 10:28 pm
Tegger
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Default Re: tpms light came on

JRStern <JRStern@foobar.invalid> wrote in
newsm4dr55kigf2sotd6c7h20ki6el6e0lblm@4ax.com:


>
> So, does it take a couple of samples to convince itself that the
> pressure is OK? How the heck does the sensor work anyway?
>




The TPMS will sample tire rotations once the car's speed is over
30 mph for about a minute. If it likes what it sees, it will then turn the
light off.

Some tips:
* Use a hand-held gauge (NOT the one on the air pump), and use the same
gauge for all the tires.
* Check and set the pressures COLD and OUT OF THE SUN. First thing in the
morning before the sun hits the tires is best. If you must add air when the
tires are warm, set the pressures TOO HIGH, then bleed off some air the
next morning to arrive at the final pressures.
* An ordinary bicyle pump is great for fine-tuning the pressures a pound or
two at a time.
* Inspection by eye is NOT reliable; tires will only be obviously visually
low once they're down to about half their proper pressures.

Another important tip: Occasionally, one tire will "settle" to a final
rolling circumference that is different from the others. This can cause
sufficient rotational differential from the other tires that can fool ABS-
based TPMSs into thinking that tire is low. You can check this by carefully
measuring the distance from the ground to the top of the wheel rim on each
of the two tires on an axle. This must be done with the car on a perfectly
flat surface, such as the concrete pad of a gas station.


--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
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  #10 (permalink)  
Old 03 Apr 2010, 11:48 pm
Tony Harding
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Posts: n/a
Default Re: tpms light came on

On 04/03/10 18:57, JRStern wrote:
> On Fri, 02 Apr 2010 22:39:06 -0500, "Elmo P. Shagnasty"
> <elmop@nastydesigns.com> wrote:
>
>> In article<pm4dr55kigf2sotd6c7h20ki6el6e0lblm@4ax.com >,
>> JRStern<JRStern@foobar.invalid> wrote:
>>
>>> New Accord EX4 sedan about four months out of the dealer, haven't done
>>> a thing yet but put gas in it and putter around town. Noticed the
>>> TPMS light on, pulled over to look at the tires. Nothing obvious, so
>>> I drove on. Next time, I looked carefully, maybe the right front was
>>> a tad low?

>>
>> Didja ever READ the OWNER'S MANUAL about that little light?
>>
>> And no, your eyeball is NOT an air pressure gauge.

>
> Speak for yourself.
>
>>> So, does it take a couple of samples to convince itself that the
>>> pressure is OK? How the heck does the sensor work anyway?

>>
>> Oh, I dunno. What does your OWNER'S MANUAL for your SHINY NEW $25,000
>> TOY say?

>
> You're not going to fool me like that, I know how that worked out at
> the end of Raiders of the Lost Ark!
>
> OK, I understand there's some federal mandate that we have these
> things, and I guess they work by emitting deadly radiation and
> reporting my whereabouts to the FBI at every moment. Just as in five
> years, we'll have the same devices rammed up our asses for Obamacare.


I F***ING KNEW IT! THANKS, BRO!

One word - prepare!
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