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post #21 of 28 (permalink) Old 06-17-2017, 05:15 PM
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Quote:
Originally Posted by Array View Post
The owner manual pictures Len posted above is what I quoted in post #8, but my AD2 tow group full size spare also does not have the sensor. Can't go by the manual though because this is also documented in then manual and not true:

Fuel Economy (ECO) Mode
The Fuel Economy (ECO) mode can improve the vehicle’s
overall fuel economy during normal driving conditions.
To activate ECO mode press the “Controls” button
on the touchscreen and then press the “ECO” button on
the touchscreen. When ECO mode is engaged a green
light in the center stack of the instrument panel will be
illuminated and a green ECO light will also illuminate in
the Electronic Vehicle Information Center (EVIC) or
Driver Information Display (DID). In 4WD models, ECO
mode is only active in ’4WD Auto’ driving mode. If you
switch to another driving mode the ECO button will turn
grey and the ECO light in the instrument panel will
disappear indicating it is no longer in ECO mode. It will
automatically re-enable ECO mode when you switch
back into 4WD Auto.


Eco mode is again, euro spec for diesels. Really wish they'd clean that up. Causes this kind of confusion.


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post #22 of 28 (permalink) Old 06-17-2017, 05:27 PM
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Quote:
Originally Posted by Array View Post
The owner manual pictures Len posted above is what I quoted in post #8, but my AD2 tow group full size spare also does not have the sensor. Can't go by the manual though because this is also documented in the manual and not true:

Fuel Economy (ECO) Mode
The Fuel Economy (ECO) mode can improve the vehicle’s
overall fuel economy during normal driving conditions.
To activate ECO mode press the “Controls” button
on the touchscreen and then press the “ECO” button on
the touchscreen. When ECO mode is engaged a green
light in the center stack of the instrument panel will be
illuminated and a green ECO light will also illuminate in
the Electronic Vehicle Information Center (EVIC) or
Driver Information Display (DID). In 4WD models, ECO
mode is only active in ’4WD Auto’ driving mode. If you
switch to another driving mode the ECO button will turn
grey and the ECO light in the instrument panel will
disappear indicating it is no longer in ECO mode. It will
automatically re-enable ECO mode when you switch
back into 4WD Auto.


Also JeepCares at one point confirmed this was a mistake in the manual.


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post #23 of 28 (permalink) Old 06-17-2017, 06:02 PM
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Aussie spec Trailhawk with 'full sized matching spare tyre' (on steel rim) does not have a TPMS.

However, when trying to work out if it did I put the spare on and left the original wheel in the garage. Drove for about 3 km and the pressure indicator on that wheel changed slightly but did not go off so I assumed it had one. It definitely did not so no idea why the reading changed slightly.

Picked up one off ebay for cheap (around $15US) and had it fitted to my new matching rim and now I rotate all 5. Can take a few hundred meters before the newly fitted wheel is recognized correctly but all works fine after that.


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post #24 of 28 (permalink) Old 06-17-2017, 06:02 PM
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Quote:
Originally Posted by Len1304 View Post
Really wish they'd clean that up. Causes this kind of confusion.

Right. On the documentation regarding "The EVIC/DID will also display a “SPARE LOW PRESSURE” message to remind you to service the flat tire.", I wondered if the NAFTA TPMS system would display this if a flat tire with the proper sensor was in the well. Guess not.

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post #25 of 28 (permalink) Old 06-17-2017, 08:51 PM
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I bought mine new. Read my signature. I have a 2016 Trailhawk with every Factory Option except the remote CD player. Sticker price:
$45,180.00! When the road assistants removed my right front tire, the position on the EVIC read 0. When they installed my full size spare, same tire as the other 4 but mounted on a steel wheel, not a matching aluminum wheel, the position (RF) read 30 psi. My EVIC monitors the 4 positions. It does not monitor the spare; or, at least I have never seen a reading. The OM says that the spare has a TPMS which the EVIC can monitor. In my case, I interpret this to mean it can be read when mounted in one of the 4 driving positions. This is what happened to me. The flat tire was placed in the back. The EVIC no longer read its TPMS. I did not see the Spare Low Pressure warning.

I never would have known any of this had I not sliced the inside sidewall. New tire was $192.00. I never heard or felt anything which would cause about a 4" slit.

Because MT was a deal breaker for me, even though I built my TH on the Jeep site, I could not order MT because it was no longer being offered, and at the time of purchase, last August, 17s were being built. So, my Dealer found my Jeep. It came from Randy Wise CDJR located in Clio, Michigan, just north of Flint. The distance between Fort Wayne and Clio is around 200 miles. The Jeep had 374 miles when I purchased it. I know that my Dealer didn't mention anything to me about the spare, but I suppose that anything could have happened to my Jeep during the first 174 miles of its life up in Clio.

Now, one possibility could be that me having a TPMS in my spare might have something to do with the water in Flint. Might as well blame someone or something.

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post #26 of 28 (permalink) Old 06-19-2017, 12:21 AM
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I have a full size spare in a TH rim from a wrecked TH it has the TPMS that came from wrecked TH. The 5th sensor dose not interfere with the 4 on the road. I have had it on the TH and it only took approx 1/4 of a mile before it updated. When I air down and air up for off-road it takes only approx 100 feet to update the pressure the farthest one took would be 1/4 of a mile to update. when I air up the low pressure warning goes away once I start moving again and reads normal. I hope that this real world experience helps.
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post #27 of 28 (permalink) Old 06-19-2017, 05:23 AM Thread Starter
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I have a full size spare in a TH rim from a wrecked TH it has the TPMS that came from wrecked TH. The 5th sensor dose not interfere with the 4 on the road. I have had it on the TH and it only took approx 1/4 of a mile before it updated. When I air down and air up for off-road it takes only approx 100 feet to update the pressure the farthest one took would be 1/4 of a mile to update. when I air up the low pressure warning goes away once I start moving again and reads normal. I hope that this real world experience helps.
So, a 5th wheel that didn't originally come with the vehicle had TPMS and it was recognized by the Jeep without doing anything? The original spare did NOT have TPMS, but it "just worked"?

What are your vehicle specs?

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post #28 of 28 (permalink) Old 06-19-2017, 10:28 AM
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I was told that the TPMS is a range to sensor device and no coding is included, so the vehicle will look for four signals at the for points on the vehicle an read any TPMS at that location the spare not moving would not have a signal. I have a June 2014 build 3.2 liter TH without the tech package
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