Volvo XC90 2018 Owner's Manual page 431

Gear selector inhibitor
The gear selector inhibitor prevents accidental
changing between different gear positions in an
automatic gearbox.
There are two different types of gear selector
inhibitor - mechanical and automatic.
Mechanical gear selector inhibitor
The gear selector can be moved forward and
back freely between N and D. Other positions are
locked with a latch that is released with the inhib-
itor button on the gear selector.
With the inhibitor button depressed the lever can
be moved forwards or backwards between P, R,
N and D.
Automatic gear selector inhibitor
The automatic gear selector inhibitor has special
safety systems.
From park position - P
To select a gear position other than the P posi-
tion, the brake pedal must be depressed and the
ignition position must be II.
From neutral position - N
If the gear selector is in the N position and the
car has been stationary for at least 3 seconds
(irrespective of whether the engine is running)
then the gear selector is locked.
To be able to move the gear selector from the N
position to another gear position, the brake pedal
must be depressed and the ignition position must
be II.
Related information
Gear positions for automatic gearbox
•
(p. 426)
STARTING AND DRIVING
Kick-down function
Kick-down can be used when maximum acceler-
ation is needed, such as for overtaking.
When the accelerator pedal is pressed all the
way to the floor (beyond the position normally
regarded as full acceleration) a lower gear is
immediately engaged. This is known as kick-
down.
If the accelerator is released from the kick-down
position, the gearbox automatically changes up.
Safety function
To prevent over-revving of the engine, the gear-
box control program has a protective downshift
inhibitor.
The gearbox does not permit downshifting/kick-
down which would result in an engine speed high
enough to damage the engine. Nothing happens
if the driver still tries to shift down in this way at
high engine speed – the original gear remains
engaged.
On kick-down the car can shift down one or more
steps at a time, depending in engine speed. The
car shifts up when the engine has reached is
maximum engine speed in order to prevent
engine damage.
Related information
Gear positions for automatic gearbox
•
(p. 426)
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