GMC duramax diesel 2016 Supplement Manual page 75

74 Driving and Operating
Standby Speed (default = 900
rpm) so maximum power is
available.
The first elevated engine speed,
PTO Standby Speed, is not
intended as a working speed but
as a verification that the system
is active and ready to go to a
working speed. This speed can
be modified to a working speed
with the GM Service Tool. The
upper limit for PTO Standby
Speed is 1500 rpm.
The remote switches and relay
connections are made at the
PTO Upfitter Connector located
on the chassis frame behind
the cab.
The PTO Control setting on the
Service Tool must be
programmed to Remote PTO
Mode Switch before the remote
switches can be used.
The PTO relay is programmed to
be enabled in the factory default
configuration.
Refer to the service manual or
go to the Upfitter Integration
website www.gmupfitter.com for
details and advanced
programming features.
Variable PTO
Variable Enable Conditions
In-Cab Operation
To enable PTO:
1. With the engine running, shift
the vehicle into P (Park) and
set the parking brake. Do not
press the brake pedal.
2. Press and release the PTO
In-cab switch below the climate
controls in the center stack.
The PTO indicator will blink
rapidly until the PTO load relay
becomes engaged and will
then be on steady. The engine
will advance to the PTO
Standby Speed.
3. Once PTO Standby Speed is
reached, the cruise control
-/SET and +/RES buttons can
be used to tap up and tap
down the engine speed.
Factory setting for the tap step
is 100 rpm and the setting for
the ramp rate is 150 rpm/sec.
The GM Service Tool can
enable the capability to change
the default value for tap step
via the Radio Customization
menu. The default values for
both tap step and for ramp rate
can be changed with the GM
Service Tool. The accelerator
pedal is disabled, and cannot
be used to control PTO engine
speed.
Variable Enable Conditions
Remote Operation
Requires programming with the GM
Service Tool and the appropriate
remote switch panel provided by
Upfitter.
1. Confirm that cruise control
is off.
2. Turn off the engine. The key
can be removed and vehicle
locked, if desired.
3. Set the parking brake and shift
the transmission into P (Park).
4. The hood must be closed.