Chevrolet Silverado 4500HD, Руководство пользователя

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Power Take-Off 8-7
Stationary PTO Mobile PTO
PTO: REDUCE VEHICLE
SPEED
PTO: DISENGAGE CRUISE
CONTROL
PTO: RELEASE BRAKE
PTO: REDUCE ENGINE
SPEED
PTO: SET PARK BRAKE PTO: RELEASE BRAKE
PTO: REDUCE ENGINE
SPEED
PTO: PRESS and
RELEASE BRAKE
PTO: SHIFT TO P OR N
PTO: REDUCE VEHICLE
SPEED
PTO: DISENGAGE CRUISE
CONTROL
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Transmission Control Module (TCM)
The TCM adjusts shift patterns to minimize shifting
during PTO operation. The TCM also provides
transmission gear states and temperature conditions to
the PTOM via serial data messages.
Electronic Brake Control Module (EBCM)
The EBCM disables the PTO if wheel speed pulses are
larger than calibratable values. The EBCM also
disengages the PTO during a traction control event.
PTO Enable Conditions
Stationary PTO
The following conditions must be met in order to
engage stationary PTO:
• The engine must be running.
• The vehicle cannot be moving and the parking
brake must be set.
• The shift lever must be in PARK (P) or
NEUTRAL (N).
• The brake pedal must not be pressed.
• Cruise control must be OFF.
In-cab PTO operation: Press and release the in – cab
PTO switch to the ON position. The PTO telltale
indicator will flash fast until the PTO load becomes
engaged. When the load becomes engaged, the telltale
indicator will stop flashing and stay illuminated. The
cruise control SET
– and RES + switch positions can
then be used to establish the desired PTO operating
speed.
Remote PTO operation: Press and release the PTO
remote arm switch, then within five seconds, press and
release the PTO remote engine start/shutdown switch.
The remote PTO indicator light will illuminate when the
PTO load is engaged. The PTO remote SET or PTO
remote variable speed switches can then be used to
establish the desired PTO operating speed. These
switches are accessed through the PTO upfitter
connector, located under the passenger side door.
Mobile PTO
The following conditions must be met prior to engaging
mobile PTO:
• The engine must be running.
• The vehicle speed must be less than the PTO top
vehicle speed limit. The default setting is 94 km/h
(58 mph). This limit can be adjusted.
• The shift lever must be in M1, M2 or M3.
• The brake must be pressed and then released.
The brake must then remain released.
• Cruise control must be OFF.
• Engine speed must be less than the maximum
allowed PTO engage speed of 1500 RPM.
Press and release the PTO in-cab switch to the ON
position. The PTO telltale will flash fast until the PTO
load becomes engaged. When the load becomes
engaged, the telltale will stop flashing and stay
illuminated. The SET
– and RES + switches can then
be used to establish the desired PTO operating speed.
PTO Disengage Conditions
Stationary PTO
The stationary PTO mode will disengage if any of the
following conditions are detected by the vehicle
modules:
• Vehicle movement
• The park brake is released
• The transmission is shifted from PARK (P) to
DRIVE (D) or REVERSE (R).
• The PTO load becomes disengaged
• A press and release of the PTO in – cab switch to
the OFF position.
• A press and release of the PTO remote engine
start/shutdown switch (stationary remote
PTO only).
• A press and release of the PTO E-STOP switch
(stationary remote PTO only).
Mobile PTO
The mobile PTO mode will also disengage if the
following conditions are detected by the vehicle
modules:
• A press of the brake pedal
• Vehicle speed exceeds 94 km/h (58 mph)
• Engine speed exceeds the maximum allowed
PTO operating speed of 2100 RPM
• The PTO load becomes disengaged
• A press and release of the PTO in – cab switch to
the OFF position
The PTO control system will attempt to limit accelerator
pedal and PTO switch input as the vehicle approaches
the above operational limits. There are some vehicle
conditions, such as down hill acceleration, which may
cause vehicle speed or engine speed limits to be
exceeded. Under those conditions, PTO is disengaged.
Modes of Operation
Preset PTO Mode
Preset PTO can only be used when the vehicle is not
moving. The engine speed is initially set to a standby
engine speed of 900 RPM. This provides an initial
start-up engine speed to match the engagement of the
PTO load. The PTO standby engine speed can be
reprogrammed to higher speeds.
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual