General
When the transfer shift lever is L4 or LL position and A-TRAC switch is turned on, the A-TRAC helps
restrain wheelspin by controlling the brake fluid pressure that is applied to the spinning wheels, and
distributes the drive force that would have been lost through the slippage to the remaining wheels in order
to achieve an effect that is similar to LSD.
It independently controls the brake hydraulic pressure to the four wheels in accordance with the extent
of the slippage at the wheels, as detected by the Skid Control ECU.
Effectiveness of A-TRAC
The effectiveness of A-TRAC is as follows:
Off-road drivability that is equivalent to having the center differential locked and limited slip
differentials on both front and rear has been realized.
This function makes the operation of the differential lock switches basically unnecessary to ensure the
ease of driving.
A-TRAC allows for drivability benefits similar to those of locked differentials, while still allowing for
the vehicle to be steered at low speeds, without the binding that would normally be associated with locked
differentials.
You didn't say whether you were in L4 or LL?