Chevrolet Silverado 4500HD/5500HD/6500HD Owner Manual (GMNA-
Localizing-U.S.-12102101) - 2019 - crc - 10/2/18
280
Driving and Operating
Mobile Mode
To disengage PTO:
.
Press the brake pedal. The PTO
system releases control of
engine speed, but the PTO load
relay remains engaged. The
engine will return to base idle
unless the accelerator pedal is
pressed. The PTO load relay
remains engaged. The PTO
indicator light will blink slowly
indicating that a PTO set speed
is still stored in memory. Upon
releasing the brake, the factory
default programming is for the
engine speed to remain at curb
idle awaiting an input from +RES
on the cruise control to restore
engine rpm to the last PTO set
speed. The system can also be
programmed to return engine
rpm to the PTO Standby Speed
setting.
.
Press
*
on the cruise control.
The engine returns to base idle,
but the PTO load relay remains
engaged. The PTO indicator
light will blink slowly indicating
that a PTO set speed is still
stored in memory. Pressing
+RES on the cruise control will
restore engine rpm to the last
PTO set speed.
.
Press the PTO in-cab switch.
Load relay disengages and the
engine returns to base idle. The
PTO indicator light will turn off,
indicating the PTO load relay is
disengaged and the stored set
speed has been cleared from
memory.
Mobile Mode will also disengage if:
.
PTO feedback input is lost. The
engine speed is returned to the
PTO Standby speed setting and
the load is still engaged. This is
configurable with the GM
Service Tool.
.
Vehicle Speed exceeds Max
Vehicle Speed. Factory default
setting = 94 km/h (58 mph). PTO
relay will re-engage and
advance to the last engine
speed stored in memory when
both the Vehicle Speed is
reduced below 94 km/h (58 mph)
and the engine speed ramps
down below the maximum PTO
engagement speed (1500 rpm
factory default setting).
.
Engine Speed exceeds Max
Engine Speed for more than
15 seconds. Factory default
setting = 2100 rpm.
.
5
on the cruise control is
pressed.
.
The parking brake is applied.
.
The shift lever is moved out of
manual shift selection, M1,
M2, or M3.
Resume memory speed is cleared
for the above actions.
Although the PTO system attempts
to limit accelerator and PTO switch
inputs to comply with maximum
speed and/or rpm parameters, some
vehicle operating conditions such as
downhill acceleration can cause the
vehicle speed or engine rpm to
exceed these limits. In those cases,
the PTO system may disengage.