2017 transmission update? - Toyota Sienna Forum - siennachat.com
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post #1 of 25 (permalink) Old 03-14-2017, 12:34 PM Thread Starter
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2017 transmission update?

Just picked up the 2017 sienna. Throttle response is horrible below 30 mph. Hoping it will improve but I was reading here someone said there may be a software update for it. Does anyone have any info on this? Everything else is much better than the 2012 we traded.
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post #2 of 25 (permalink) Old 03-14-2017, 02:09 PM
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Re: 2017 transmission update?

Kind of ironic that when I said I wanted a leftover '16 rather than a new '17 because of potential issues just like this, all I got back from several "experts" on this forum was that Toyota had the new engine/trans combo fully tested and proven after its initial install in the Lexus line.

Looks like the "experts" are wrong again.
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post #3 of 25 (permalink) Old 03-14-2017, 05:06 PM
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Re: 2017 transmission update?

2016 vs 2017 seems to be a mixed response. Many are very happy with the new drivetrain, but there seems to be enough gripes over driveability and throttle response to tell me that some reprogramming is in order once they gather more data.

I've told you guys this more than once.....

Current: '15 Sienna Limited Premium (FWD), '14 Subaru Outback, '13 Honda CRV AWD.

Past: '08 Sienna LE (FWD), '02 Subaru Outback, '02 Honda Odyssey EX
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post #4 of 25 (permalink) Old 03-14-2017, 06:26 PM Thread Starter
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Re: 2017 transmission update?

It does work perfectly in a 2016 gs350. I have one. This seems like a simple fix via a programming update.
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post #5 of 25 (permalink) Old 03-14-2017, 07:45 PM
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Re: 2017 transmission update?

GS350? Isn't that a RWD sedan, with a fore-aft mounted engine and totally different transmission? So many differences I don't see how you can compare.
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Current: '15 Sienna Limited Premium (FWD), '14 Subaru Outback, '13 Honda CRV AWD.

Past: '08 Sienna LE (FWD), '02 Subaru Outback, '02 Honda Odyssey EX
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post #6 of 25 (permalink) Old 03-14-2017, 07:45 PM
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Re: 2017 transmission update?

The throttle response or lack of it could be due to the extra 700 pound weight of the Sienna over the Lexus.
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post #7 of 25 (permalink) Old 03-14-2017, 08:39 PM
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Re: 2017 transmission update?

Have you try using the 'power' button
I felt the same as you when I first drove my 2017 SE
But after I tried the power button, it did make a different
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post #8 of 25 (permalink) Old 03-14-2017, 09:05 PM Thread Starter
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Re: 2017 transmission update?

same or very similar 3.5L engine / 8 speed transmission. Yes, you are right, it is probably tuned different, and there are other differences, but bottom line is the acceleration is not laggy at all. My answer was based on the fact that the engine / transmission combo has been used in other Toyota vehicles.

Yes, i tried the ECT power, i dont notice much of a difference. It seems a bit harsher on the shifting. Also, the van only has 575 miles, so it may improve on its own...
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post #9 of 25 (permalink) Old 03-15-2017, 12:40 PM
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Re: 2017 transmission update?

Quote:
Originally Posted by Aptekcom View Post
same or very similar 3.5L engine / 8 speed transmission. Yes, you are right, it is probably tuned different, and there are other differences, but bottom line is the acceleration is not laggy at all. My answer was based on the fact that the engine / transmission combo has been used in other Toyota vehicles.
Sorry to have to call you out on this, but statements like this are very much a part of the problem!

See the attached picture. The RWD transmission on the left is a Aisin TL-80SN. I swiped the image from a 2014 SAE article I saved. The TL-80SN is identical to the Toyota AA80E. I also have an SAE Tech Paper from 2007 that describes the workings of this then breakthru transmission. Yes, it's THAT old! The transmission in your GS350 is the mildly updated AA81E. The main difference is a revised final drive ratio. It's likely headed for End Of Life, replaced by the new 10 Speed tranny for RWD applications.

The transmission on the right is the all new UA80E, introduced in August 2016. There is also an F variant for AWD. It's a joint development design of Aisin & Toyota, and used for the very first time (and exclusively ?) in the Highlander & Sienna for the 2017 model year. It is based on, but not parts or software compatible with the U880E/F that's been used for several years in the Lexus RX.

And we've coupled all this for the first time with a broad range Atkinson-capable engine.

So when people make the broad brush statement that it's all carryover technology and well proven out, well, it's just not true!
Attached Images
File Type: jpg AA80E-AA81E vs UA80E.JPG (120.2 KB, 20 views)
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Current: '15 Sienna Limited Premium (FWD), '14 Subaru Outback, '13 Honda CRV AWD.

Past: '08 Sienna LE (FWD), '02 Subaru Outback, '02 Honda Odyssey EX
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post #10 of 25 (permalink) Old 03-15-2017, 03:37 PM Thread Starter
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Re: 2017 transmission update?

Fair enough. Thanks for the explanation and clarification. Now I really hope they can fix the lagging. Seems like a programming issue to me but I'm just guessing.
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post #11 of 25 (permalink) Old 03-15-2017, 04:15 PM
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Re: 2017 transmission update?

Mine has 1200mi on the odometer and feels the same way... the ECT-PWR button helps, but it turns back off each time the ignition is turned off...
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post #12 of 25 (permalink) Old 03-17-2017, 03:30 PM
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Re: 2017 transmission update?

Sadly the sceptics were right.
Sit tight folks. Apparently Tacomas are going through a transmission reprogramming for multiple issues and it seems rather successful, so someone at Toyota appears to be listening.
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post #13 of 25 (permalink) Old 03-17-2017, 03:41 PM
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Re: 2017 transmission update?

We're in the process of buying a 2017 Limited AWD, should we be waiting for the 2018?
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post #14 of 25 (permalink) Old 03-17-2017, 04:36 PM
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Re: 2017 transmission update?

We can't condemn them all, as there certainly seem to be a lot of delighted customers out there. But do your pre-signing test drive with eyes wide open, and be prepared to walk if it's a dog. Even on a special order, you typically have the right to leave if the product doesn't drive right.

Leave the kids with grandma when you go do this! Distractions are NOT a wise idea when signing on a vehicle that costs almost as much as my first house did nearly 40 years ago.

Current: '15 Sienna Limited Premium (FWD), '14 Subaru Outback, '13 Honda CRV AWD.

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post #15 of 25 (permalink) Old 03-17-2017, 06:51 PM
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Re: 2017 transmission update?

fibber2, sent you a PM. Thx.
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