Last post on Aug 21, 2013 at 5:16 PM
You are in the Toyota Sequoia
What is this discussion about?
Toyota Sequoia, Toyota Highlander, Toyota 4Runner, Toyota Land Cruiser, Toyota RAV4, Toyota Tacoma, Truck, SUV
Jul 19, 2006 (12:39 pm)
I got a response from Toyota and they said that the Center Differential Lock and the ATRAC system can "both be engaged at the same time."
I asked them specifically about the 2006 / 2007 V8 Sport 4Runner, so that vehicle is the one they referenced their answer to.
If you wish to ask them about your vehicle go to Toyota's website. It takes a long time for them to respond, so don't expect an answer for a while.
Hope this is helpful to you.
#2002 of 2493 Question re: 99 4 Runner 4X4
Sep 01, 2006 (8:19 pm)
I have a 3rd generation 4X4. Auto Trans. The smaller of the 2 shift levers has a button on the side which allows me to go into 4 wheel drive at just about any speed up to 60mph. When I am in 2 wheel drive and press this button in, the light flashes on the instrument cluster, until 4 wheel drive "kicks in" at which time there is a muffled clunk noise, and the four green lights come on indicating "You are now in 4 wheel drive". Here's the question. Sometimes it takes 5-10 seconds for this little process to occur, and other times it doesn't seem to want to work at all. Whats going on here? Is there a grease fitting that lubricates this process? Why will it not go into 4X4 or at least takes
its sweet time. PS. I try to "exercise" this procedure every couple of weeks or so. Should I be doing this more regularly? Thanks for any help. As an aside.....I Love this machine, it is so solid, reliable, good looking, and tough. I will never, ever, ever buy another north american made domestic vehicle, GM, Ford, Chrysler....they are flashy, but underneath and inside, they are all crap. Thanks.
#2003 of 2493 Re: Question re: 99 4 Runner 4X4 [toyodave]
Sep 14, 2006 (10:37 am)
Toyodave, you must have a 99 limited model, which has the same 4WD system as my 02 SR5 model (minus ATRAC and VSC). In my experience the process you speak of is normal. When I shift into AWD (ie, 4WD w/ center diff unlocked) the light on the dash usually blinks for a few seconds and then there is a "muffled clunk" as it engages, as you said.
If you are stationary, and want to shift in AWD, you can (1) press the 4WD button and shift the tranny into neutral and back to drive--this often helps engage and disengage the system quicker. If you are moving, you can either carefully follow step 1 or you can (2) blip the throttle on and off until it engages while driving in a straight line (I believe the manual recommends driving straight). The throttle blip technique has worked for me, but it can take 5-10 sec to engage.
Just last night, I used step 1 (shifting in to neutral while parked), and it worked like a charm--took about 2-3 sec. I usually try to do that if I know I am going to be driving in the rain or snow, and leave the moving engagement of the system for the more rare occassions when weather conditions change while I am driving.
Again, this is my own experience over the last 4 years of ownership. I hope it helps.
#2004 of 2493 Re: Question re: 99 4 Runner 4X4 [chiefjojo]
Sep 14, 2006 (11:59 am)
Thanks for your reply. I will try this technique next time I drive my 99 4Runner. I discovered another thing last week that helps it get into 4 wheel drive, and that is if you turn the wheel like your going to turn a corner, either left or right, (while the yellow blip is flashing on the intsrument panel), it also helps the 4 wheel drive to "kick in". I wonder if some gear or spline has to align "just so" before it will engage. If you didn't use your 4 Wheel Drive for a year I wonder if it would ever work again or what? Happy Driving
#2005 of 2493 2000 4Runner AWD
Oct 25, 2006 (9:40 pm)
I couldn't find this particular system explained - everthing seems to revolve about the TRAC system...
I have a 2000 4Runner Limited with the button on the 4WD lever that allows you to engage what I _think_ is an AWD mode. I _think_ this has the 3 open differentials (please correct me if I'm wrong - the manual is completely useless here), but this vehicle doesn't have the TRAC feature installed on LCs of that year and 4Runners starting in 2001.
So...in 2WD mode, with an open rear differential (I don't have the locker anyway), in a low traction situation power goes to the wheel that's spinning, and you go nowhere. Now...putting it into this AWD mode, I extend this metaphor so that if either rear wheel slips, all of the power is transferred to the rear - and to the wheel that's slipping by the rear differential - and...well, you still go nowhere.
If that's true, then it seems like the reverse would be true - if a front wheel were slipping, all the power would go there.
And that's simply ridiculous - this system would seem to transfer all the power to the wheel that has no traction! Obviously, I'm missing something important here.
Assuming someone can explain what my AWD system does (I think I've got a handle on the part-time 4WD part), I then have a followon question ...if one wheel is slipping (in snow, for example), what would be the effect of lightly applying the brake _and_ the accelerator? A light brake would stop that spinning wheel, right? Effectively a manual TRAC system?
#2006 of 2493 Re: 2000 4Runner AWD [curlew]
Oct 27, 2006 (4:06 pm)
I think what you're missing is this. With 4WD engaged, the rear wheels are not linked together so they will spin. However, I beleive during this time the fronts are locked together, that is to say, left or right front can't just spin away without the other on the same axle, turning also. Where it starts to get really good is if you have rear "diff lock". Your press that button (usually on the dash) and it locks the two rear wheels together, and now you have drive to both front and back wheels, and the wheels on the same axle are locked together, and therefore, no wheel spin, and it will be mighty hard to get stuck. Does this answer it?
#2007 of 2493 Re: 2000 4Runner AWD [toyodave]
Oct 27, 2006 (10:27 pm)
Well, it answers it if that were true. But you're saying that the front is "locked" in AWD? That just can't be true either - locking the front would make it impossible to turn since the outer wheel would travel farther (same issue as locking the center differential on pavement and then turning). Unless the front were a LSD rather than an open differential, or there were some other spin sensing mechanism like the brake thing. And we're talking normal everyday driving here, not loose conditions - so there should be (and as far as I can tell there is) no detectable difference in "normal" conditions.
Oct 28, 2006 (5:41 am)
You may be right about the front wheels not being "locked", and perhaps this is to enable you to steer......but, I know for a fact the rear wheels are "locked" because the manual says max 5mph, and not on dry pavement, and of course you can feel it. If as you say the front wheels cannot be locked together then.....how can you prevent the fronts from spinning on ice mud or snow? I still contend they are locked together, perhaps with an LSD. My original query to this discussion board was "why does it sometimes take so long for the 4WD to kick in when selected via the electronic push button on the 4WD stick?" Do you know the answer to that one? Thanks.
#2009 of 2493 Re: To Curlew [toyodave]
Oct 28, 2006 (10:09 am)
Because a "dog-clutch", spline type, coupling is used to lock the center diff'l. The splines must first line up perfectly in order for the shaft to slide into the lock position.
SOP, nature of the beast.
A slow creep will generally rsult in a quicker lock-up, and I sometimes had to put my Jeep in reverse.
Oct 28, 2006 (2:33 pm)
Oh Ok. You know more than you let on. That's the first decent explanation I have had of that question....Thanks !!!!