Volvo VNL Operator's Manual page 98

Instruments and Controls 93
Traction Control System Telltale
The amber telltale will blink only when the
Traction Control System (TCS) mud/snow
mode is engaged. At all other times, the
TCS system operates in the background
without indication. The system does not
have an on/off switch. See page 287 for
W3000962
more information.
The TCS only operates at speeds lower
than 25 mph (40 km/h). The system detects
wheel spin by comparing wheel speeds and
controls the spin by using the brake system
to transfer power to wheels with greater
traction. Under circumstances where all
drive wheels are spinning, the system sends
a signal to the engine control unit to reduce
power.
The TCS includes a TCS mud/snow switch
for turning the system off to increase wheel
spin. This function may be desirable in
deep snow or mud to keep the vehicle from
bogging down.
W3001336
To operate, press in the bottom part of the
switch. The switch stays in this position
and the TCS telltale light blinks to indicate
that the mud/snow mode is engaged. To re-
turn to normal TCS operation, press the
bottom part of the switch again and it will
return to rest position.