Hill Start Aid (HSA)
Hill Start Aid (HSA) prevents unwanted
vehicle movement on steep grades when
transitioning from the brake to throttle
pedal. HSA can be disabled using the Hill
Start Aid Disable switch (see Hill Start Aid
(HSA) Disable Switch on page 31).
HSA activates by default on a road grade
of 2% or greater, but can be configured to
activate on a 1% or 3% grade. See Hill
Start Aid Operation (HSA) on page 37 for
use.
Hold Gear Mode (option)
Hold Gear mode replaces Manual mode
and is useful when the operator wants to
use the engine braking provided by a
specific gear (reducing brake usage) or
when the resulting jolt from changing gears
might prove unfavorable due to the current
driving conditions.
When activated, Hold Gear mode has two
available effects:
• If the current gear is lower than the
programmed hold gear, the
transmission will not upshift further
than the programmed hold gear
and will deny any upshift requests
that exceed the hold gear (see
Manual Mode).
• If the current gear is equal to or
higher than the hold gear
, Hold
Gear mode will maintain the
current gear and deny any shift
requests made by the operator
(see Manual Mode).
NOTE
The hold gear can be changed at a
PACCAR Powertrain distributor
.
Load-based Shifting
This feature will adjust the transmission
shift schedule, changing the shift points,
based on
•
V
ehicle weight (load)
• Road grade
• Engine rpm
• Accelerator pedal position
These inputs help determine when to
smoothly (and efficiently) shift between
gears, improving fuel economy and
performance. The transmission then
retains the new shift schedule when
making future shifting decisions. If vehicle
load changes, load-based shifting will need
to set a new shift schedule, adjusting the
shift points after the first few shifts.
If the operator selects a gear that will result
in engine lugging or overspeeding, the shift
will be denied.
Load-based shifting can be customized to
meet a variety of transmission calibrations
(see Calibration Options on page
61):
• Standard
• Performance
• Tanker
NOTE
A new calibration can be selected at a
PACCAR
Powertrain distributor. Not all
calibration options are available with
all engine/transmission model combi-
nations.
Low Mode
Low mode restricts the transmission to first
gear, providing additional torque. If
activated while moving, Low mode will
downshift the transmission, slowing the
FEA
TURES - Hill Start Aid (HSA)
16 Y53-1349-1A1 (02/2022)
2
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