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Originally Posted by bhicks
I'm kinda new here, and I've been reading in some threads about trucks with VSC, TRAC, etc. What's all that stuff, and how would I find out if my truck has it. I think it might have some sort of mechanism preventing me from spinning my tires too much 'cause I was a little stuck  in some mud. I tried to make it out and the engine dropped back to almost idle. I took my foot off the gas for a few seconds and tried it again, then everything came back to normal. I tried the whole thing again just to see what would happen. The same stuff.
What is this thing and how does it work? |
If your profile is correct that you have a 2003 Tundra, you don't have VSC. It was not available on the Tundra until the 2004 model year.
BRAKE CONTROL SYSTEM
(ABS with EBD, Brake Assist, TRAC/A-TRAC, VSC and Auto LSD System)
The Toyota Tundra has adopted a VSC (Vehicle Stability Control) system, which helps maintain the cornering stability of the vehicle if the vehicle is about to slip sideways due to a sudden steering maneuver
or unexpected changes in surface conditions.
The 4WD model has adopted an Active-TRAC system, which gives the vehicle a high level of drive-through performance in various surface conditions, ranging from snow-covered roads to rough offroad conditions. The 2WD model has adopted a TRAC system, which suppresses the slippage of the drive wheels.
An ABS with EBD system, which properly distributes the braking force to the front and rear wheels in accordance with the driving conditions of the vehicle, has been adopted.
A brake assist system, which assists the driver who cannot press the brake pedal firmly, has been adopted. If the driver presses the brake pedal suddenly, this system determines the action to be emergency braking,
and generates a large braking force.
A hydraulic brake booster unit has been adopted. This unit integrates the brake booster function, master cylinder function, and the actuators for the VSC, Active-TRAC, ABS, and Brake Assist system.
A newly developed Auto LSD has been adopted.
Brake Assist System
The Brake Assist system in combination with ABS helping improves the vehicle’s brake performance. The Brake Assist system interprets a quick push of the brake pedal as emergency braking and supplements the brake power applied if the driver has not stepped hard enough on the brake pedal. In emergencies, a driver, especially inexperienced ones, often becomes panic and does not apply sufficient pressure on the brake pedal.
TRAC System (For 2WD Model)
If the driver presses the accelerator pedal aggressively when starting off or accelerating on a slippery surface, the drive wheel could slip due to the excessive amount of torque that is generated. By applying hydraulic brake control to the drive wheels and regulating the throttle to control the engine output, the TRAC system helps minimize the slippage of the drive wheels, thus generating the drive force that is appropriate for the road surface conditions.
A-TRAC System (for 4WD Model)
If a tire slips while the vehicle is being driven on a snow-covered road or off-road, the function of the differential gear causes a large amount of drive force to be applied to the tire that is slipping. The A-TRAC function helps restrain the slippage by controlling the engine output and brake fluid pressure that is applied to the slipping wheel, 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 the LSD (Limited Slip Differential). 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. It functions as a conventional TRAC while operating in the 2WD mode (or on a 2WD model).
VSC System
The VSC system is designed to help control the vehicle behavior by controlling the engine output and the brakes at each wheel when the vehicle is under one of the conditions indicated below.
When the front wheels lose grip in relation to the rear wheels (strong front wheel skid tendency).
When the rear wheels lose grip in relation to the front wheels (strong rear wheel skid tendency).
When the skid control ECU determines that the vehicle exhibits a tendency to front wheel skid or rear wheel skid, it decreases the engine output and applies the brake of a front or rear wheel to control the vehicle’s yaw moment.
Auto LSD System
The Auto LSD achieves the equivalent functions of an LSD (Limited Slip Differential) through the use of a traction control system. For this reason, the contents of brake control are the same between Auto LSD and TRAC. When the driver presses the Auto LSD switch, this system achieves the LSD effect by regulating the hydraulic pressure that acts on the drive wheels and controlling the engine output in accordance with the amount of pedal effort applied on the accelerator. TRAC enhances the startoff performance of the vehicle during low-resistance surface conditions, such as snow or mud, by restricting the acceleration effort during a startoff, in order to prevent the wheels from spinning. On the other hand, Auto LSD tends to enhance the acceleration effort somewhat, in order to apply greater drive torque to the wheel that is making contact with the ground. Thus, this function enables the vehicle to get unstuck if a wheel loses its grip, and enhances the vehicle’s startoff performance on high-resistance surface conditions such as gravel roads.
Vsc??
!
Linear Mode
