Toyota Tundra Quick Reference Manual page 272

To disable A-TRAC (4L mode on 4WD models)
If the vehicle gets stuck in fresh snow or mud, A-TRAC may reduce
power from the engine to the wheels. You may need to turn the sys-
tem off to enable you to rock the vehicle in order to free it.
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Automatic reactivation of TRAC, A-TRAC and VSC
Turning the engine switch off after turning off the TRAC, A-TRAC and VSC
systems will automatically re-enable them.
■
Sounds and vibrations caused by the ABS, TRAC, A-TRAC, VSC and
brake assist system
●
A sound may be heard from the engine compartment when the engine is
started and just after the vehicle begins to move. This sound does not
indicate that a malfunction has occurred in any of these systems.
●
Any of the following conditions may occur when the above systems are
operating. None of these indicates that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
• The brake pedal may pulsate slightly after the ABS is activated.
• The brake pedal may move down slightly after the ABS is activated.
■
If the brake system overheats
TRAC or A-TRAC will cease operation and a buzzer will sound to alert the
driver. The TRAC OFF indicator will come on. Stop the vehicle in a safe
place. (There is no problem with continuing normal driving.)
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Shifting to 4L
VSC is automatically turned off.
Stop the vehicle completely, and
press the VSC OFF switch for
more than 3 seconds.
The TRAC OFF indicators will
come on.
Push the switch again to turn the
system back on.
I n f o r ma t i o n P r o v i d e d b y :
2-4. Using other driving systems
2
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