voodoolord
New member
Ive been reading the manual and watching the videos and scouring the net and it seems that auto LSD only works with 2 wheel drive. My limited is full time 4 wheel drive but still has the ALSD. Am I missing something?
Why do I have auto LSD on my 4x4?
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BlackWorksInc
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Huh? Uhm... I don't know what you mean by "Auto" LSD.
Technically speaking the Limited does come with a T3 Torsen Center Differential that you can lock in the transfer case. It is technically an LSD by definition, but it is lockable to divert a 50/50 power split from the transfercase.
Technically speaking the Limited does come with a T3 Torsen Center Differential that you can lock in the transfer case. It is technically an LSD by definition, but it is lockable to divert a 50/50 power split from the transfercase.
voodoolord
New member
Its the button next to the A-Trac button with the squirrely car symbol. It says in the manual that it's auto lsd 2 wheel only. Im trying to figure out why I have a button there and if its actually something else.
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FrontRange4Runner
New member
I believe Auto LSD is 2wd only. Either you have a 2WD Limited or you are looking at the traction control button.
voodoolord
New member
Maybe I missed it in the manual. Ill have to look again. Heres the button, the one on the left of A-Trac.
![a>~original](http://<a href="http://s1087.photobucket.com/user/voodoolord/media/Mobile%20Uploads/20151028_224015_zpstjbzlv0q.jpg.html" target="_blank"><img src="http://i1087.photobucket.com/albums/j480/voodoolord/Mobile%20Uploads/20151028_224015_zpstjbzlv0q.jpg" border="0" alt=" photo 20151028_224015_zpstjbzlv0q.jpg"/></a>~original)
voodoolord
New member
This must be track, vsc and trailer sway control? Kinda confusing when they use the same symbol for different functions.
voodoolord
New member
Ok that makes more sense. So the limited has always on traction control and you can turn it off. Ive been trying to figure out the difference between this full time 4 wheel drive and the selected 4 wheel drive on the switch.
voodoolord
New member
What situations would you want wheel spin? Just wondering.
FrontRange4Runner
New member
Deep snow, deep mud or any time you need to keep momentum in certain situations. Generally speaking, it is best to just leave that button alone unless you have specific need for such things...
voodoolord
New member
Cool thanks.
Bilbo
New member
On the full-time 4WD High of the Limited, TRAC (not A-TRAC) and VSC (Vehicle Stability Control) are pretty much two parts of the same system. I think they are best distinguished by the sensors that activate them. From Toyota literature:
"Toyota’s VSC monitors steering angle and the direction your vehicle is traveling."
"Toyota’s TRAC sensors are activated when one of the drive wheels starts to slip."
That seems to be where the differences end:
When it senses that the front or rear wheels begin to lose traction, VSC reduces engine power and applies braking to selected wheels.
TRAC limits engine output and applies the brakes to the spinning wheel.
In the Limited's 4WD Low, VSC and TRAC are automatically turned off but you can activate A-TRAC.
"Toyota’s VSC monitors steering angle and the direction your vehicle is traveling."
"Toyota’s TRAC sensors are activated when one of the drive wheels starts to slip."
That seems to be where the differences end:
When it senses that the front or rear wheels begin to lose traction, VSC reduces engine power and applies braking to selected wheels.
TRAC limits engine output and applies the brakes to the spinning wheel.
In the Limited's 4WD Low, VSC and TRAC are automatically turned off but you can activate A-TRAC.
voodoolord
New member
Thanks Bilbo. I did a search on turning off traction control and got a lot of info about people disconnecting the plug on the 4th gen rigs. Is that basically what that button is doing? Like Toyota saw people doing this and put a button in for it?
wfo9
New member
The all have traction/stability control that is on by default. It is geared towards driving on the road... The button sort of turns it off. Some of it still seems to stay active.
As far as full time vs selected 4wheel drive goes... In full time you have a center differential at play distributing uneven amounts of TQ and RPM to the front and rear wheels. This is what allow you to make sharp turns on dry pavement without any binding....
Once you switch to 4wd Hi, the center differential is locked and both front and rear axles will see the same power and RPM. This is what you want in more difficult offroad terrain where traction is limited. Switching to 4wd Lo will engage an additional reduction gear which is ideal for extreme terrain where slow crawls are required. The A-Trac button is also very useful here as it will engage an aggressive brake activated anti slip mechanism that will attempt to keep all 4 wheels turning at the same speed.
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Its for doing donuts in the mud and snow.
Bilbo
New member
Toyota wouldn't put in a disconnect for a safety system without good reason. In this case, there are a few circumstances where VSC off would be useful. And yes, also good for doing doughnuts.
Here are a couple of links:
"VSC Explained"https://www.youtube.com/watch?v=xPxt6Pw00yA
http://www.toyota-4runner.org/5th-gen-t4rs/157195-vsc-saved-me.html
What wfo9 says. Minor correction. On the full-time 4WD LE, the designations are H4F (high gear, center diff unlocked), H4L (high gear, center diff locked), and L4L (low gear, center diff locked).
4Rager
New member
If you just push it, it will deactivate TRAC. If you push it and hold it down while in either N or P it will deactivate TRAC & VSC. From my experience if you don't turn off both it doesn't really do anything since as soon as you have wheelspin and lateral motion (such as doing donuts, drifting on a dirt road or driving in snow) the VSC shuts you down anyway.
As far as turning back on at a certain speed, I've driven in the 30-50 mph range in 2H/4H with it turned off plenty of times and it's never come back on. What I did hear was a guy who was turning it off as he was a aggressively driving up windy mountain roads and it was still interfering with him. My guess is he unknowingly only turned off TRAC and not VSC, so as the vehicle wanted to get sideways the VSC still kicked in.
