As per the 2007 FJ CRUISER - Owner’s Manual, the “AUTO LSD” system aids traction by using the traction control system to control engine performance and braking when one of the rear wheels begins to spin.
It improves traction by reducing wheel spin on slippery surfaces. This system should only be used when wheel spinning occurs in a ditch or rough surface. This system is effective in case one of the rear wheels is spinning.
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