Originally Posted by Silver Seeker
I bought a 2010 Toyota Tacoma 4x4 with an "Auto Limited Slip Diff". I thought I was buying a truck with a limited slip differential. The local Toyota dealer says "oh, that's not a limited slip differential, its a braking system in the axle, and it ISN'T MADE TO WORK IN 4WD!!!"
It certainly doesn't work like a limited slip differential - if I am four wheeling and get diagonal wheels off the ground - I'm stuck!
I really feel like I got bait and switched by the manufacturer.
Anybody else have comments or complaints on this?
1) All 2009+ Tacomas have 'TRAC' in 2WD (limited slip traction control using brakes and engine output regulation) and 'AUTO LSD' in 2WD (TRAC without engine output regulation).
2) All 2009+ Tacomas have 'TRAC' in 4WD-High... however, in 4WD there is no engine output regulation... the same as AUTO LSD is, in 2WD.
3) The TRAC can be turned off in 2WD or 4WD if you want open differentials.
4) 2009+ Tacomas 4WD LOW RANGE is open differentials only, unless you have the OFF ROAD TRD.
5) Off Road TRD 4WD Tacomas have A-TRAC and/ or a Locking Rear Differential both available in Low Range.
Here is how to use the VSC OFF SWITCH to use the TRAC system:
Here are the buttons, dials and lights associated with the traction controls in an Off Road 4WD Tacoma:
The lights are different... So, I just took some photos so we all can see. Let's go through the levels of traction activation and see what it all looks like:
Normal dial position for paved roads or where traction assistance of 4WD (four wheel drive) is not needed.
The lower switch, next to mirror controls (car with skid lines below) is the VSC OFF switch. This also activates AUTO LSD when in 2WD with a quick push. Auto LSD is traction control without the engine output regulated.
This is what comes on with AUTO LSD active. The VSC OFF light goes out above 30 mph.
If you stop the truck and hold down the VSC OFF switch for 3+ seconds, VSC and TRAC both turn off for open differential(s) in H2 or H4.
Go into H4 (4WD High Range) from 0-60 mph if you need more traction because of poor conditions or off highway needs.
This is the 4WD High Range indicator light... two differentials and 4 tires. TRAC in H4 has no engine regulation, the same as AUTO LSD in H2.
For more torque to power through deep snow or mud or to climb up or down steep grades, stop truck, put tranny into N (Neutral, not Park), and rotate dial to L4.
Low Range 4WD indicator light. VSC goes off in L4 and both differentails are open.
If your 4WD Tacoma is an '09 + Off Road TRD, you have 'Active Traction Control' (A-TRAC) that provides the 'brake-locking' of any non-traction (spinning) tires front or rear for tractor like crawling/ climbing. Gives traction control while in low range. Push this switch just once when in L4 and A-TRAC will activate when-ever needed to keep moving while in L4.
A-TRAC activated light.
As Toyota states, use only as a last resort and turn off when out of trouble.
While in L4 (for 4WD Tacomas), press the RR DIFF LOCK switch. (I engaged it twice today while stopped)
The Rear Differential Lock indicator is the x'ed rear differential image. If it doesn't engage, or if it is pressed while in H4 or H2 (for 4WD Tacomas) it will BLINK! Remember, when locked there is no differential action to allow the tires to rotate at different speeds, as needed when turning.