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Peterbilt 579 - Page 207

Peterbilt 579
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CRUISE CONTROL
Press the ON/OFF button if the
vehicle has dash board mounted
cruise control switches or the
CANCEL button if the vehicle has
cruise control switches on the
steering wheel.
Resuming Cruise
Control
1. If you
tapped the brake or
clutch pedal, the cruise control
remembered the previously set
cruise speed. To resume that
set speed, accelerate above the
minimum cruise control speed and
press the "RESUME" button.
2. If you
pressed the "OFF" button
(or the steering wheel mounted
"CANCEL" button) or turned the
ignition key OFF, this cleared the
system memory and you will need
to set a new cruise speed.
(04/13)
Using Cruise Control for Stationary
PTO Operation
Setting Idle
Speed
1. Ensure parking
brakes are applied.
2. Ensure transmission
is in Neutral.
3. Engage PTO
per the
manufacturer's operating
instructions.
4. Press the
"ON" button.
5. Press the
"SET" button to obtain
the desired engine rpm.
Cancelling Cruise
Control
You
can cancel cruise control in any
of these ways:
Tap the brake pedal.
Tap the clutch pedal.
Y53-6047–2C
Press the "OFF" button (or
the steering wheel mounted
"CANCEL" button).
NOTE
Cruise control functions and features
may vary depending upon which en
-
gine you have. For specic expla-
nation of your cruise control, see the
cruise control or engine manual in
-
cluded with your vehicle.
This vehicles electronic system will
perform a ‘rationality check’ every time
the vehicle is started. This check is
to ensure that the service brakes are
working before allowing cruise control
to function. This safety feature is
designed to ensure that a driver is able
to cancel the cruise set speed by using
the service brake pedal. The system
will not allow cruise control operation if
it does not pass the ‘rationality check.’
The instrument cluster will prompt you
to press the service brake pedal if it
4-35
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