Wayne Moses

Hello All

Does anyone know where this is? Hyundaitech?

Yesterday for the first time the readout was clearly incorrect since it was
reading a steady 60 deg.F while the outside temperature was clearly over 72
deg.F - by thermometer and by feel.

This morning it seemed to be back to its old self - adjusting itself after
a minute or two following startup.

Maybe it is starting to get flaky.

Best Regards
Wayne Moses <wmoses@houston.rr.com> Fri, 15 Dec 2006 09:00:04 -0600

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Eric G.

Wayne Moses <wmoses@houston.rr.com> wrote in
news:1166217161@wmoses.houston.rr.com:

> Hello All
>
> Does anyone know where this is? Hyundaitech?
>
> Yesterday for the first time the readout was clearly incorrect since
> it was reading a steady 60 deg.F while the outside temperature was
> clearly over 72 deg.F - by thermometer and by feel.
>
> This morning it seemed to be back to its old self - adjusting itself
> after a minute or two following startup.
>
> Maybe it is starting to get flaky.

Most likely it was a dead short between the driver's seat and the steering
wheel :-P

Eric

hyundaitech

Your ambient temperature sensor should be mounted to the vertical support
in front of the radiator.

Because of its location, there's complicated logic involved in whether the
control head uses the temperature it reads from the sensor or keeps the old
temperature. The logic is intended to not allow the heat from the radiator
to influence the temperature reading. Unfortunately, I know of nowhere
where Hyundai specifies what logic they use for this.

Wayne Moses

Hello hyundaitech,

h> Your ambient temperature sensor should be mounted to the vertical
h> support in front of the radiator.
h>
h> Because of its location, there's complicated logic involved in
h> whether the control head uses the temperature it reads from the
h> sensor or keeps the old temperature. The logic is intended to not
h> allow the heat from the radiator to influence the temperature
h> reading. Unfortunately, I know of nowhere where Hyundai specifies
h> what logic they use for this.

Thanks for the good info (as usual). I will have a look and make sure there
is no debris or anything there.

When I drove off and noticed the constant 60 deg.F reading, it was sitting
on a concrete parking lot in open sun -- a situation that tends to give an
initial false high reading. Normally, after driving off the read temp would
drop to the correct temperature. In this particular case, it was behaving
counter to that.

Have you seen m/any complaints regarding this sensor in your shop?

Regards,
Wayne Mose

Wayne Moses

Hello Eric G.,

E> Most likely it was a dead short between the driver's seat and the
E> steering wheel :-P

Haha .... first thing I checked ... but then my wife, who is not dead but
is short, pushed the button also and got the same result.

Regards,
Wayne Mose

Edwin Pawlowski

"Wayne Moses" <wmoses@houston.rr.com> wrote in message
>
> When I drove off and noticed the constant 60 deg.F reading, it was sitting
> on a concrete parking lot in open sun -- a situation that tends to give an
> initial false high reading. Normally, after driving off the read temp
> would drop to the correct temperature. In this particular case, it was
> behaving counter to that.

I can't speak about Hyundai yet because it has been OK so far and I've not
had it during the summer. On my Buick, even on a very hot day, the
temperature would not always show if it is higher than the last reading when
the car was shut down for only a few hours. If I did not use the car all
day, it would usually be on the high side as you note, then comes down after
drive off.

If the actual temperature was lower, it would come down to the correct
reading very shortly after the car is moving. If the actual temperature is
higher, I'd have to drive for at least 3 miles before the reading would go
up. It is possible to take a couple of short trips, say 1 to 1.5 miles, and
have the reading the same as the earlier low reading. The reason for the
lag to increase is so that sitting in traffic the sensor is not quickly
fooled by engine heat.

The there was the day I was listening to the radio station. 101.0 FM at 1:01
on a hot summer afternoon when the temperature was 101 degrees. I thought
the computer just went crazy for that moment.

hyundaitech

Haven't had any complaints with Tiburon. I believe there are TSBs about
inaccuracy on Sonata, Azera, and Santa Fe, however.

What may have been happening with your car is that the control unit
thought the higher actual temperature was influenced by the radiator, so
it kept the cooler temperature instead of changing.

Wayne Moses

Reply to message from "Edwin Pawlowski" <esp@snet.net> (Fri, 15 Dec 2006
16:14:20) about "Re: 2005 Tiburon GT - Outside temperature sensor":

EP> I can't speak about Hyundai yet because it has been OK so far and I've
EP> not had it during the summer. On my Buick, even on a very hot day, the
EP> temperature would not always show if it is higher than the last
EP> reading when the car was shut down for only a few hours. If I did not
EP> use the car all day, it would usually be on the high side as you note,
EP> then comes down after drive off.

EP> If the actual temperature was lower, it would come down to the correct
EP> reading very shortly after the car is moving. If the actual
EP> temperature is higher, I'd have to drive for at least 3 miles before
EP> the reading would go up. It is possible to take a couple of short
EP> trips, say 1 to 1.5 miles, and have the reading the same as the
EP> earlier low reading. The reason for the lag to increase is so that
EP> sitting in traffic the sensor is not quickly fooled by engine heat.

I must say that I have not paid as close attention to this as you have with
the Buick. Thanks for sharing the experience though.

In my case despite the temperature difference between shut-down and start-
up it always took a minute or two to settle down and read right.

EP> The there was the day I was listening to the radio station. 101.0 FM
EP> at 1:01 on a hot summer afternoon when the temperature was 101
EP> degrees. I thought the computer just went crazy for that moment.

That is indeed weird. :-)

Best Regards
Wayne Moses <wmoses@houston.rr.com> Fri, 15 Dec 2006 22:12:11 -0600

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Wayne Moses

Reply to message from "hyundaitech" <notpublic@not.public.com> (Fri, 15 Dec
2006 17:28:32) about "Re: 2005 Tiburon GT - Outside temperature sensor":

h> Haven't had any complaints with Tiburon. I believe there are TSBs about
h> inaccuracy on Sonata, Azera, and Santa Fe, however.

Their sensors are probably quite similar right?

h> What may have been happening with your car is that the control unit
h> thought the higher actual temperature was influenced by the radiator,
h> so it kept the cooler temperature instead of changing.

Could well be. I guess the logic was not designed for the strange Houston
weather we were having the last few days - quite cool in the morning but
getting pretty warm in the afternoon. I will have to keep a closer eye on
it.

Thanks again.

Best Regards
Wayne Moses <wmoses@houston.rr.com> Fri, 15 Dec 2006 22:38:20 -0600

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