Does your 2007 2WD V6 transmission do this?

[tacotime2]

Please let me know if your transmission does this. I've never had a vehicle that did until this one. (This is a 2007 SR5 V6 2WD with 24,000 miles.)

- Find a flat, straight section of road with no traffic following you.
- Put it in D (for Drive.)
- Bring the vehicle up to 45 MPH or so, without pushing it hard, until the overdrive/torque converter locks up and drops the engine RPM like it should.
- Then let off the gas completely and coast.

Now:
- When the speed reaches about 33 MPH, does the transmission engage itself, and apply engine braking, and noticeably slow the vehicle, without you doing anything at all?

- Then after it slows itself down to about 20MPH, does the transmission disengage itself and then allow the vehicle to freely coast?

Mine does this, set in D for Drive. Iv'e never seen this behavior in a transmission. It has to be hurting gas mileage since I have to re-apply the gas where I used to coast along freely before.

I took a ride with a Toyota service foreman and he noticed it right away but said he wasn't sure if it was normal and wanted to test another 2007 but we didn't have time then.

Does yours do this?

Thanks.

 

[cv4runner]

Please let me know if your transmission does this. I've never had a vehicle that did until this one. (This is a 2007 SR5 V6 2WD with 24,000 miles.)

- Find a flat, straight section of road with no traffic following you.
- Put it in D (for Drive.)
- Bring the vehicle up to 45 MPH or so, without pushing it hard, until the overdrive/torque converter locks up and drops the engine RPM like it should.
- Then let off the gas completely and coast.

Now:
- When the speed reaches about 33 MPH, does the transmission engage itself, and apply engine braking, and noticeably slow the vehicle, without you doing anything at all?

- Then after it slows itself down to about 20MPH, does the transmission disengage itself and then allow the vehicle to freely coast?

Mine does this, set in D for Drive. Iv'e never seen this behavior in a transmission. It has to be hurting gas mileage since I have to re-apply the gas where I used to coast along freely before.

I took a ride with a Toyota service foreman and he noticed it right away but said he wasn't sure if it was normal and wanted to test another 2007 but we didn't have time then.

Does yours do this?

Thanks.

Although I haven't written down the exact MPH and RPm this is what my 2006 V6 does.

 

[DC Dude]

:yummie:

 

[morphius909]

Please let me know if your transmission does this. I've never had a vehicle that did until this one. (This is a 2007 SR5 V6 2WD with 24,000 miles.)

- Find a flat, straight section of road with no traffic following you.
- Put it in D (for Drive.)
- Bring the vehicle up to 45 MPH or so, without pushing it hard, until the overdrive/torque converter locks up and drops the engine RPM like it should.
- Then let off the gas completely and coast.

Now:
- When the speed reaches about 33 MPH, does the transmission engage itself, and apply engine braking, and noticeably slow the vehicle, without you doing anything at all?

- Then after it slows itself down to about 20MPH, does the transmission disengage itself and then allow the vehicle to freely coast?

Mine does this, set in D for Drive. Iv'e never seen this behavior in a transmission. It has to be hurting gas mileage since I have to re-apply the gas where I used to coast along freely before.

I took a ride with a Toyota service foreman and he noticed it right away but said he wasn't sure if it was normal and wanted to test another 2007 but we didn't have time then.

Does yours do this?

Thanks.

Mine sort of does those on decents, but that's considered Grade Logic I believe. Never felt anything on a straight patch of road. Mind you ours is 4x4.

 

[thetaxguy]

Have not noticed it on flat sections, but I have noticed it on slight downgrades (1%-2%). I have a '08 V6 2wd.

 

[jpless]

I've noticed this as well on my 2006 v6. I even tried to play it off to my friend with an xc60 saying it was a comparable feature to his volvo's streetsmart system, although I doubt it's a safety feature and is much more of an annoyance and gas waster.

 

[azrls3220]

Yes mine does that - I think it saves wear and tear on the brakes?

 

[ALLEGRO]

I read this last night and checked my Limited V8 AWD today. NO, it does not do this on flat ground.

Comments about brakes is valid, but I would rather buy new brake pads than a new engine. JMHO

 

[riverwolf]

The trans never disengages in 'D'...that would imply it shifted to Neutral, which it can't...there's a physical linkage from the shift to the trans. It sounds like you're observing a downshift. When you locked the TC at slightly above 45, you were in 5th. As your speed falls, the TCU will first unlock the TC and eventually will have to downshift once the TCU decides 5th is too tall for the present speed.

-Brent

 

[Jono6716]

My 4runner does this as well. Kinda annoying but it does save you from braking. Honda's do this as well. Driven a newer civic and accord and they both shift down on inclines as well.

 

[kylebacc]

Mine does this. Used to really annoy me back when I first got the truck. Mine is also 2WD but I doubt that makes a difference. Interesting to hear that some people don't notice it. I just kind of got used to it and now it's not really a big deal. My one buddy always complains when he drives my truck, but what am I going to do about it? I'm pretty sure that's just the way this particular transmission is. Is it weird? Yes. Does it waste enough gas to warrant a fix? Probably not, but I don't know how I could figure that out for sure.

 

[Uneek]

Now:
- When the speed reaches about 33 MPH, does the transmission engage itself, and apply engine braking, and noticeably slow the vehicle, without you doing anything at all?

Tested for it over the weekend. It does this on my '06 4WD V6.

- Then after it slows itself down to about 20MPH, does the transmission disengage itself and then allow the vehicle to freely coast?

Did not notice this.

 

[kylebacc]

Did not notice this.

That one's a little more subtle. Sometimes you can feel it, other times no.

For both, I was also thinking for people with larger (heavier) than stock tires, their rolling momentum (I don't know what the technical term is, I'm not a physics major) might help them not notice it as much by just feeling for it.

:cheers:

 

[tacotime2]

Some say yes and some say no, so that's not positive.

I've never been in a car in 40 years of driving where the transmission decided to slow you down on its own on flat ground. Where I used to come down the street and coast to my house (not downhill), the 4Runner slows me and I have to get back on the gas again.

I think it's a fault. Maybe the grade logic feature is broken and left on full time. The mechanic thought not because no error code is shown, but maybe that feature has no error detection circuit.

Doing this on flat ground is an obvious gas waster and added wear on the transmission from all the activity.

Still investigating. If anyone has any more info, please post.

Thanks.

 

[kylebacc]

Some say yes and some say no, so that's not positive.

I've never been in a car in 40 years of driving where the transmission decided to slow you down on its own on flat ground. Where I used to come down the street and coast to my house (not downhill), the 4Runner slows me and I have to get back on the gas again.

I think it's a fault. Maybe the grade logic feature is broken and left on full time. The mechanic thought not because no error code is shown, but maybe that feature has no error detection circuit.

Doing this on flat ground is an obvious gas waster and added wear on the transmission from all the activity.

Still investigating. If anyone has any more info, please post.

Thanks.

x2

only 6 years of driving though and only 9 different cars... :hiding:

 

[tacotime2]

Just wanting to bring this issue up again in case some new readers want to post any info.

This transmission bugs the duke out of me.

Thanks.