![]() Second Push and Hold for 3 Seconds ("Auto LSD" light off, "VSC OFF" light on,"Traction Control OFF" light on) = No functionality of the ATRAC, Auto LSD, or VSC systems. One Push and Hold for 3 Seconds ("Auto LSD" light on, "VSC OFF" light on) = Same as One Push, but without VSC functionality. ![]() Auto LSD overrides the ATRAC function, so the truck does not cut power from the engine. One Push ("Auto LSD" light on) = Same as Normal, but with the addition of the Auto LSD function. Normal (no buttons pressed, no dash lights on) = Truck will detect wheel spin and retard engine timing along with application of the brakes to the spinning wheel as needed. Auto LSD only works in 2wd, and is defaulted to "OFF". If the initial light pressure does not work, the system will gradually apply more "drag" to that wheel to help send power to the other side of the axle. This simulates having traction to that wheel and forces equal amounts of power to both sides of the differential. The Auto LSD senses wheel speed differences between the two REAR tires only, and lightly applies the brakes to add drag to the wheel that does not have traction. VSC is defaulted to "ON".Īuto LSD - Automatic Limited Slip Differential. Will apply brakes and cut throttle to "steer" the vehicle back into the intended line of travel. Uses the ABS sensors along with steering wheel sensor and yaw sensors to determine if the vehicle is not following the path intended by the driver. On a sheet of ice where all 4 tires are on ice without traction, from a stand-still, climbing an incline, the only thing you can do is give her the beans and build some momentum. Super Special Note: A-TRAC only works if at least one tire has traction. If you reduce the throttle during a climb and the RPMS drop below 1800, the system stops locking the wheels. It also protects the driveline/transfer case/axles/ differentials and braking system/rotors/pads from being over stressed from the high torque of the motor. If you hit the pedal harder, ATRAC thinks you are trying to get unstuck from deep mud/snow and releases brake pressure and allows maximum wheel spin to free the vehicle. It will start working again when you release the brake pedal.Įven More Special Note: Hold the rpms consistently from 1800-2200 rpms. Special Note: If you hit the brake pedal while ATRAC is actively working, it shuts off. (as identified by Grazer, TRAC is the 2wd term and ATRAC is the 4wd term, but they function the same, so the terms are used interchangeably here) ATRAC is defaulted to "ON" when the truck is started in any drive mode (2WD, 4HI, 4LO). When loss of traction is detected the wheel slip light flashes and you’ll hear ticking noises until traction is returned. ![]() Can also retard engine timing to reduce power applied to the driveline (to prevent breakage of driveline parts). It applies the brakes to stop a spinning wheel. When one of the wheels begins to slip, TRAC applies a wheel brake individually to the tire without traction and reduces engine output to help assist the driver with control of the vehicle in a straight line.ĪTRAC - Or A-TRAC, this is Toyota's Active Traction Control. TRAC - Traction Control helps maintain traction on wet, icy, loose or uneven surfaces. ![]() A modern 4-Channel ABS system can individually brake each wheel as needed, and monitors all four wheel speeds in relation to each other. Prevents wheel lockup during braking to keep control over directional changes while braking hard or in a panic situation. Here’s how Toyota have enabled us to keep traction in slippery situations.ĪBS - Antilock Braking System. The best description of an open differential ever But not so great if a wheel loses driving traction, because the differential will send all of its torque to the spinning wheel and not push the truck forward. Great for turns, when the outside wheel has to spin faster than the inside wheel. An open differential sends power down the path of least resistance. Typically, engine torque is distributed to the rear wheels through an open differential. Perhaps this can help clear some things up. I haven’t found a cohesive and definitive description of how traction control works, just a bunch of splintered threads where people ask one-off questions and get individual answers.
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