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Transmission shifting - 2017 Aurion Sportivo


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Hi guys, 

I’m going to see Toyota about this but thought I’d ask it here anyway and I’ll explain it as best as I can. 
2017 Sportivo with 26k on the clock. Has been taken care of very well. Just recently I noticed the transmission behaving differently when the car warms up.

I always let the car warm up a little bit before I set off from a cold start. The shifts are short, snappy and smooth, just like they’re supposed to be. 

However, when the car has been at operating temperature a little bit, the transmission starts behaving a bit sluggish, especially between 3/4 and 4/5, mainly between the 1-2k rpm range. If I floor it, the shifting is quite snappy. However, if I’m just driving normally, the shifting is definitely not as snappy. 

It also does this thing where after the rpms drop when the next gear is engaged, there’s a little jump in rpms and back down again before resuming acceleration. This is particularly apparent under light throttle at speeds around 30-40km/h. Rpms go down after the gear change, then jump around 300rpm, and then back down again, then normal acceleration ensues. 

I tried putting into sport mode, and the shifting was much sharper, but there is still some rpm hunting, definitely not as bad. 

Could it be something with the programming or maybe it’s slightly low in fluid? 

I’m going to get Toyota to look at it, because I don’t remember this happening a few weeks ago. 
 

Edited by VeradaMan
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Howdy,

I have the exact same car as you albeit a few months older along the production line. So you bought the car brand new ? If not then perhaps ATF needs attention/checking but find it hard to imagine since it's virtually brand new with negligible kms.

The only thing I can say is that with a very light foot/throttle & low revs the tranny can be somewhat slack/slow, I think it's in the cars nature or as a servicing dealer technician would say "normal characteristic". So yeah it's in the ECU tune for the ATM. Generally I hardly notice the shifts & they're usually quick & smooth with the tranny inclined to upshift into top gear as soon as possible. The hunting issue I haven't noticed on my car though.

I suspect it's still under warranty, if just out of it no doubt Toyota would assist you regardless.

Edited by ZZT86
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Sounds like shift flare, possibly low on fluid. When does is happen more often, when cold or at normal running temp? First thing first, check for obvious signs of fluid loss. One word of caution: try to find a reputable, trustworthy Toyota service centre, they're not all the same. Besides, it's anyone's guess whether you'll be able to replicate the flare when driving the car with a service technician around the block or not.

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Thanks for the replied everyone 

It happens when the car is warm. No issues when the car is cold and getting up to operating temp. 

Car is still under warranty. 

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20 minutes ago, VeradaMan said:

Thanks for the replied everyone 

It happens when the car is warm. No issues when the car is cold and getting up to operating temp. 

Car is still under warranty. 

Based upon my limited experience, I would be confident in saying that the fluid level is not low. If the fluid level was low, I would expect having shifting issues when the ATF is cold.

Toyota service Centre will need to scan the ATM computer control unit to check for any codes relating to the change solenoids and sensors. There could be an issue with the electrical connections for the shift solenoids that only occurs when the ATF is at operating temperature.  

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1 hour ago, campbeam said:

Based upon my limited experience, I would be confident in saying that the fluid level is not low. If the fluid level was low, I would expect having shifting issues when the ATF is cold.

Toyota service Centre will need to scan the ATM computer control unit to check for any codes relating to the change solenoids and sensors. There could be an issue with the electrical connections for the shift solenoids that only occurs when the ATF is at operating temperature.  

This definitely seems plausible. I’m aware that most issues are worse when the car is cold so I was sceptical about it being a fluid issue. I had a feeling it was something more electrical. 
 

Thanks mate. I’ll describe the problem to the dealer just like I have here and hopefully they’ll be able to fix it. 

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4 minutes ago, VeradaMan said:

I’ll describe the problem to the dealer just like I have here and hopefully they’ll be able to fix it. 

I am expecting that the Dealer will look at any Service Bulletins and most likely update the transmission control software. If that does not solve the issue, next step is to consider whether a replacement of the valve body is required. Just as well the vehicle is under warranty.

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1 hour ago, campbeam said:

I am expecting that the Dealer will look at any Service Bulletins and most likely update the transmission control software. If that does not solve the issue, next step is to consider whether a replacement of the valve body is required. Just as well the vehicle is under warranty.

Warranty ends in Jan. 

I plan on jumping on this straight after exams. Just went for a longish drive and it performed ok with smooth changes and none of that funny business. 

Hopefully a reset will fix it. I baby the thing, so it’s not flogged either. Can count on one hand the amount of times I’ve pushed it above 4 grand haha. 

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