Volvo FM Handbook page 256

I-Shift 245
HD (Heavy Duty)
The HD program should be used when driving with
heavy loads. The HD program is activated/inactivated
by holding the E/P button depressed for at least three
seconds. When the program is engaged "HD" is shown
in the display. The selection remains even if the
ignition is switched off.
When the HD driving program is activated, starting
gear 1 is selected automatically.
(The function is optional.)
Kickdown
Kick-down is obtained by depressing the accelerator
completely (position B). Kick-down optimises the
choice of gear/throttle for maximum acceleration
which most often leads to a down shift. Kick-down
functions in both the economy and power programs,
but not in the manual mode M or in driving program P
+. Kick-down optimises the vehicle's power at the
expense of optimum fuel consumption. For the lowest
fuel consumption, only use the kick-down when
necessary. The accelerator pedal always has a
kick-down position, but access to the function is an
option.
J2012347
Position A = full throttle
Position B = kick-down
(Kick-down is an option.)