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Duramax Diesel. Manual - part 21

Driving and Operating

Programmable

Parameters

Factory Setting

Minimum Value

Maximum Value

Engine Speed Ramp Rate

150 rpm

4 rpm

150 rpm

Maximum Vehicle Speed

94 km/h (58 mph)

30 km/h (19 mph)

94 km/h (58 mph)

Minimum Remote

Potentiometer Threshold

50%

Maximum Remote

Potentiometer Threshold

95%

50%

100%

Remote Set Switch

Transition to Low Voltage

(<33% of Ignition Voltage)

SET SPEED 1

STANDBY SPEED, SET SPEED 1, or SET SPEED 2

Remote Set Switch

Transition to Open State

(>33% of Ignition, and

<67% of Ignition Voltage)

PTO STANDBY

STANDBY SPEED, SET SPEED 1, or SET SPEED 2

Remote Set Switch

Transition to High Voltage

(>67% of Ignition Voltage)

SET SPEED 2

STANDBY SPEED, SET SPEED 1, or SET SPEED 2

Horn Chirps during a

Remote Start Event

ENABLED

DISABLED

ENABLED

Personalization Menu

ENABLED

DISABLED

ENABLED

Standby Speed Menu

DISABLED

ENABLED

Driving and Operating

Programmable

Parameters

Factory Setting

Minimum Value

Maximum Value

Set 1 Speed Menu

(In Stationary Preset)

DISABLED

ENABLED

Set 2 Speed Menu

(In Stationary Preset)

DISABLED

ENABLED

Engine Run Shutdown

Time Menu

(In Stationary Preset)

DISABLED

ENABLED

Engine Speed Tap

Step Menu

(In Stationary Variable and

Mobile)

DISABLED

ENABLED

Remote Set Switch Speed

Control

DISABLED

ENABLED

Remote Throttle Speed

Control

DISABLED

ENABLED

Remote Engine Start

DISABLED

ENABLED

Remote Engine Shutdown

DISABLED

ENABLED

Throttle Override

ENABLED

DISABLED

ENABLED

Throttle Override Timer

10 Minutes

13 Minutes

Driver Door Status Usage

ENABLED

DISABLED

ENABLED

Remote PTO In Cab

Control

DISABLED

ENABLED

Driving and Operating

If the PTO factory preset
parameters do not match the
settings described above, then they
may have already been altered in
order to satisfy the requirements of
the installed PTO system and body
equipment.

The following PTO settings are also
offered via the vehicle customization
screens, which can be enabled by
your service technician. These
include the following parameters:
.

PTO Standby rpm

PTO Set 1 Speed

PTO Set 2 Speed

Tap Step Speed

PTO Engine Run Timer

Driver Information Center (DIC)
Warning Messages

If the PTO indicator light does not
remain on, it indicates that not all
PTO enabling conditions have been
met. One or more of the following
DIC messages may display if the
PTO will not engage and the
appropriate action must be taken.

PTO: SHIFT TO PARK (P)
(Stationary mode only)

PTO: SET PARK BRAKE
(Stationary mode only)

PTO: PRESS & RELEASE
BRAKE (Mobile mode only)

PTO: RELEASE BRAKE TO
ENGAGE PTO

PTO: REDUCE VEHICLE
SPEED

PTO: REDUCE ENGINE SPEED

PTO: DISENGAGE CRUISE
CONTROL

PTO: ACCELERATION UPON
BRAKE RELEASE

PTO: SERVICE PTO

PTO: SHIFT TO M1, M2 OR M3
(Mobile mode only)

In addition, the PTO indicator light
will light when all conditions
required to engage PTO have not
been met. When enabling PTO, the
PTO indicator light will turn on, then
turn off after one second. Under

normal operating conditions, the
PTO indicator light will remain on
throughout the PTO operating cycle.

Additional in-vehicle PTO module
information can be accessed by the
service technician to aid in
troubleshooting. Also see the
service manual for more
information.

The GM service technician can
access Service Tool information that
will contain reasons why PTO may
not engage and why PTO may
unexpectedly disengage due to
system conditions.

See www.gmupfitter.com for
information on the installation of
wiring and programming for PTO
aftermarket equipment.

Vehicle Care

General Information

Accessories and

Modifications . . . . . . . . . . . . . . . . . 86

Vehicle Checks

Engine Compartment

Overview . . . . . . . . . . . . . . . . . . . . . 88

Engine Oil . . . . . . . . . . . . . . . . . . . . . 93
Engine Oil Life System . . . . . . . . 97
Automatic Transmission

Fluid . . . . . . . . . . . . . . . . . . . . . . . . . 97

Engine Air Cleaner/Filter . . . . . . 101
Cooling System . . . . . . . . . . . . . . 104
Engine Coolant . . . . . . . . . . . . . . . 105
Engine Overheating . . . . . . . . . . 109
Battery (4-Cylinder

Pickup Only) . . . . . . . . . . . . . . . . 110

Electrical System

Engine Compartment Fuse

Block . . . . . . . . . . . . . . . . . . . . . . . . 111

Appearance Care

Exterior Care . . . . . . . . . . . . . . . . . 122

General Information

Accessories and
Modifications

Adding non-dealer accessories or
making modifications to the vehicle
can affect vehicle performance and
safety, including such things as
airbags, braking, stability, ride and
handling, emissions systems,
aerodynamics, durability, and
electronic systems like antilock
brakes, traction control, and stability
control. These accessories or
modifications could even cause
malfunction or damage not covered
by the vehicle warranty.

Damage to vehicle components
resulting from modifications or the
installation or use of non-GM
certified parts, including control
module or software modifications, is
not covered under the terms of the
vehicle warranty and may affect
remaining warranty coverage for
affected parts.

GM Accessories are designed to
complement and function with other
systems on the vehicle. See your
dealer to accessorize the vehicle
using genuine GM Accessories
installed by a dealer technician.

See the warranty manual.

Aftermarket Engine
Performance Enhancement
Products and Modifications

Some aftermarket engine
performance products and
modifications promise a way to
increase the horsepower and torque
levels of the vehicle's powertrain.
You should be aware that these
products could have harmful effects
on the performance and life of the
engine, exhaust emission system,
transmission, and drivetrain. The
engines, transmissions, and
drivetrains have been designed and
built to offer industry leading
durability and performance in the
most demanding applications.
Engine power enhancement
products may enable the engine to
operate at horsepower and torque
levels that could damage, create

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