2017 CHEVROLET LOW CAB FORWARD light

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
10716700) - 2017 - crc - 12/6/16
Driving and Operating 227
the hills. When going up steep hills,
you may want to step on the
accelerator pedal to maintain your
speed. When going downhill, you
may have to brake or shift to a lower
gear to keep your speed down. Of
course, applying the brake takes
you out of cruise control. Many
drivers find this to be too much
trouble and do not use cruise
control on steep hills.
When Returning to Cruise Control
Driving
If you have canceled cruise control
under the following conditions, you
can return to the cruise control
driving condition before cancellation
when you operate and release the
cruise control resume switch. The
moment the resume switch is
released, the cruise set indicator
light comes on.
.When pressing the brake pedal.
. When the selector lever is
shifted to the N position.
When the vehicle speed decreases
to 30 km/h (19 MPH) or less for the
3.0L diesel, and 40 km/h (25 MPH) or less for the 5.2L diesel, it is not
possible to return to the cruise
control driving. You must reset the
cruise control.
If the cruise control is turned back
on while the vehicle speed exceeds
what is set prior to the cancellation
of cruise control, the set vehicle
speed cannot be changed until the
vehicle reaches to the set speed.
Also, the vehicle speed must be 1
MPH below the previously set
vehicle speed.
For the 5.2L diesel engine, if you
hold the switch at the +RES
position, the vehicle will keep going
faster until you release the switch or
apply the brake. So unless you want
to go faster, do not hold the switch
at the +RES position.
Exhaust Brake Function
Diesel Vehicles Equipped with
Exhaust Brake-interlocked Cruise
Automatic activation of the exhaust
brake during cruise control driving
suppresses an increase in the
speed on a downhill slope,
decreasing the need for the driver toapply the regular brake pedal. The
exhaust brake does not activate
when the exhaust brake switch is
turn off.
The maximum slope angle at which
the system can control the vehicle
speed increase is different
depending on the load the vehicle is
carrying.
Automatic Activation and
Automatic Release of Exhaust
Brake
The exhaust brake is engaged when
the vehicle speed exceeds the set
speed on a downhill slope.
The exhaust brake is disengaged
when the vehicle slows down close
to the set.
Cruise Control (Gas)
The cruise control function allows
you to drive the vehicle at a
constant speed without operating
the accelerator pedal. Use this
function when the vehicle speed is
between 48 and 117 km/h (30 and
73 MPH) (48 and 97 km/h (30 and
60 MPH) for vehicles equipped with

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
10716700) - 2017 - crc - 12/6/16
228 Driving and Operating
105 km/h (65 MPH) speed limiting
option code EEQ). This function
should only be used when driving
without frequent starts and stops.
{Warning
Cruise control can be dangerous
where you cannot drive safely at
a steady speed. Do not use
cruise control on winding roads or
in heavy traffic. You and others
could be seriously injured.
Cruise control can be dangerous
on slippery roads. On such roads,
fast changes in tire traction can
cause needless wheel spinning,
and you could lose control. Do
not use cruise control on slippery
roads. You and others could be
seriously injured.
1. Press the cruise control mainswitch to set it to on. At this
time, the operation indicating
light will turn to green.
2. Use the accelerator pedal toadjust the vehicle to the
desired speed. Upon reaching
the desired speed, turn the
cruise control set switch. The
vehicle speed at the moment
you operate the switch is set in
the system, enabling you to
drive with the set speed
automatically maintained
without using the accelerator
pedal.
At the same time the cruise set
indicator light comes on.
Accelerating during Cruise
Control Driving
If you want to accelerate temporarily
to pass another vehicle while driving
using the cruise control, press the
accelerator pedal. When you

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
10716700) - 2017 - crc - 12/6/16
Driving and Operating 229
release the accelerator pedal, the
speed returns to the original set
vehicle speed.
When Increasing Vehicle Speed
When the cruise control resume
switch is operated, the speed
increases while the switch is held.
After the speed is increased to the
desired vehicle speed, and the
switch is released, the speed is set
at the increased vehicle speed.
If you want to increase the speed
quickly, press the accelerator pedal
and accelerate to the desired
vehicle speed. Then, operate the
cruise control set switch.When Increasing Vehicle Speed
Slightly
If the cruise control resume switch is
operated and released immediately,
the set vehicle speed increases
1.6 km/h (1 MPH) per operation.
This operation can be performed 6
times (3500 model) or 10 times
(4500 model) consecutively.
When Decreasing Vehicle Speed
When the cruise control set switch
is operated, the speed decreases
while the switch is held.
After the speed is decreased to the
desired vehicle speed, and the
switch is released, the speed is setat the decreased vehicle speed.
If you want to decrease the speed
quickly, press the brake pedal to
cancel cruise control and decelerate
to the desired vehicle speed. Then,
operate the cruise control set switch
When Decreasing Vehicle Speed
Slightly
If the cruise control set switch is
operated and released immediately,
the set vehicle speed decreases
1.6 km/h (1 MPH) per operation.
This operation can be performed 6
times (3500 model) or 10 times
(4500 model) consecutively.

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
10716700) - 2017 - crc - 12/6/16
230 Driving and Operating
When Canceling Cruise Control
Press the cruise control main switch
again to turn the cruise control
system off. The cruise control main
indicator light will go out.
The cruise control set speed is
canceled in the following cases:
.When the brake pedal is
pressed.
. When the selector lever is
shifted to the N or 1st position.
. When cruising speed is
approximately 40 km/h (25 MPH)
or lower. .
When the vehicle speed
decreases more than 20% below
your set speed
(3500 model only).
. When the cruise control main
switch is turned off.
. When the engine control switch
is turned to the LOCK position.
. When trouble develops in the
system.
. Memory speed is eliminated.
When you do not use the cruise
control, be sure to place the cruise
control main switch into off.
When you place the engine control
switch into ACC, place the cruise
control main switch into off, then
reset the cruise control if you want
to use the cruise control again.
Using Cruise Control on Hills
How well your cruise control will
work on hills depends upon your
speed, load and the steepness of
the hills. When going up steep hills,
you may want to step on the
accelerator pedal to maintain your
speed. When going downhill, you may have to brake or shift to a lower
gear to keep your speed down. Of
course, applying the brake takes
you out of cruise control. Many
drivers find this to be too much
trouble and do not use cruise
control on steep hills.
When Returning to Cruise Control
Driving
If you have canceled cruise control
under the following conditions, you
can return to the cruise control
driving condition before cancellation
when you operate and release the
cruise control resume switch. The
moment the resume switch is
released, the cruise set indicator
light comes on.
.
When pressing the brake pedal.
. When the selector lever is
shifted to the N or 1st position.
When the vehicle speed decreases
to 30 km/h (19 MPH) or less, it is
not possible to return to the cruise
control driving. You must reset the
cruise control.

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
10716700) - 2017 - crc - 12/6/16
Driving and Operating 231
For 3500 models, if the cruise
control is turned back on while the
vehicle speed exceeds what is set
prior to the cancellation of cruise
control, the set vehicle speed
cannot be changed until the vehicle
reaches to the set speed. Also, the
vehicle speed must be 1 MPH
below the previously set vehicle
speed.
For 4500 models, if you hold the
switch at the +RES position, the
vehicle will keep going faster until
you release the switch or apply the
brake. So unless you want to go
faster, do not hold the switch at the
+RES position.Driver Assistance
Systems
Speed Limiter (Gasoline
Vehicle)
Speed limiting restricts the vehicle's
speed by controlling the fuel
injection volume. It prevents the
speed from exceeding 105 km/h
(65 mph) regardless of the pressure
on the accelerator pedal.
Speed limiting does not control
braking, so it is possible for the
vehicle to exceed the set speed on
downhill slopes. If the tire size is
changed, the speed limiting may not
work normally. Be sure to use the
correct tire size specified for your
vehicle.
SeeCruise Control (Diesel) 0224 or
Cruise Control (Gas) 0227.
Fuel
Fuel (Gasoline)
Regular unleaded gasoline with a
posted octane rating of 87 or higher
should be used. It should meet
ASTMD4814 in the U.S. and CGSB
3.5-M87 in Canada. These fuels
should contain the proper additives
and in most cases nothing should
have to be added to the fuel. Pumps
in the U.S. and Canada will be
labeled UNLEADED. Only unleaded
nozzles will fit into this vehicle's
filler neck.
Gasoline with a posted octane
rating of less than 87 should not be
used in this vehicle. Using such
gasoline may cause a heavy
knocking noise when driving, which
can result in damage to the engine.
It is normal to hear a slight pinging
noise while accelerating or driving
up a hill. However, if a constant
knocking noise is heard while using
fuel rated at 87 octane or higher, the
engine should be serviced.

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
10716700) - 2017 - crc - 12/6/16
Driving and Operating 237
parts stores and other automotive
places. See your authorized dealer
for advice on using biocides in your
area and for recommendations on
which biocides you should use.
Smoke Suppressants
Because of extensive testing of
treated fuel versus untreated fuel,
the use of a smoke suppressant
additive is not recommended
because of the greater possibility of
stuck rings and guttered valves,
resulting from excessive ash
deposits.
Water Separator
The purpose of the water separator
is to separate any water from the
fuel that may have formed in the
fuel tank due to condensation.
The water separator is located on
the bottom of the fuel filter.
Caution
Remaining water that is not
discharged from the water
separator could freeze and
damage the vehicle.
If the warning light comes on
while the engine is in operation,
promptly drain the water from the
water separator (fuel filter).
Continuing to drive with the light
remaining on could damage the
fuel injection system. If this
happens, have the vehicle
checked and serviced by the
nearest dealer.
Draining Water from the Fuel
Filter
Clean off any fuel that has adhered
to the vehicle body.
Starting the engine immediately
after draining the water from the fuel
filter requires a little more time than
usual. If the engine does not start in
10 seconds, wait for a while and try
again.Fuel will be mixed in the drained
water. Dispose of it in a method
conforming to the regulatory
requirements in your state.
If the water separator (fuel filter)
requires frequent draining, have the
fuel system inspected at your
dealer.Pre Fuel Filter (Chassis-side)
1. Attach a plastic hose to the drain plug (2) on the bottom of
the chassis-side fuel filter and
put the other end of the hose in
a container placed beneath the
filter.

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
10716700) - 2017 - crc - 12/6/16
238 Driving and Operating
2. Loosen the drain plug andmove the priming pump (1) up
and down by hand between
10 and 20 times.
3. Fully tighten the drain plug (2) and move the priming pump (1)
several times.
Fuel Filter (Engine-side)
1. Attach a plastic hose to the drain plug (2) on the bottom of
the engine-side fuel filter (1)
and put the other end of the
hose in a container placed
beneath the filter.
2. Loosen the drain plug andmove the priming pump up and
down by hand between 10 and
20 times.
3. Fully tighten the drain plug and move the priming pump several
times.
4. Test run the engine and check that there are no fuel leaks
from the drain plug of the
engine-side fuel filter. Also
check that the water separator
(fuel filter) warning light
stays off.
Running Out of Fuel
(Diesel)
When the Fuel Tank is Empty
When the fuel tank is empty, air will
enter the fuel system, so refueling
alone will not be enough to restart
the engine. Use the following
methods to bleed the fuel system.
Bleeding the Fuel System
Steps for Refueling
1. Follow the directions in "Parking Brake Lever" under
Parking Brake 0221.

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
10716700) - 2017 - crc - 12/6/16
Driving and Operating 239
2. Select the correct fuel (See"Diesel Fuel Requirement and
Fuel System"). Follow any
posted safety rules. Stand to
the side, never above or
opposite the filler opening.
3. Check that the fuel cap is tight, and see to it that engine oil,
engine coolant in the reservoir,
and washer fluid, etc. are at
proper levels. Then do the
Driver Daily Checklist.
See Owner Checks and Services
0 367.
Driving your vehicle until the fuel
tank is empty may activate the
check engine malfunction indicator
light. You do not need to have your
vehicle checked. After refueling,
perform the following:
. Bleed the fuel system.
. Start, turn off and restart the
engine three or four times.
. The check engine malfunction
indicator light will be cancelled. Before Starting the Engine
1. The priming pump (1) is
located on the outboard side of
the left frame rail, in front of the
batteries. Place a container
beneath the air bleed plug (2)
to receive fuel, and then fully
loosen the plug.
2. Attach a clear hose onto the air bleed plug, direct the clear
hose into a catch pan.
3. Pump the priming pump (1) up/ down for 65 times to get most
of the air bubbles out. Note fuel
was drawn into the filter bowl at
around 40 - 50 times. 4. Fully retighten the air bleed
plug (2) and wipe off any fuel
that may have adhered to the
plug or surrounding area.
5. Continue to operate the pump for 50 times.
6. Start the engine.
7. If the engine does not start, repeat steps 5 and 6 as
necessary until it does start.
After Starting the Engine 1. Without pressing the accelerator pedal, start the
engine.
2. After the engine has started, allow it to idle for about
5 seconds.
3. Fully press the accelerator pedal and increase the engine
speed to the maximum speed
for 10 seconds. (Repeat this
operation several times.)
Insufficient air bleeding can result in
faulty engine operation. Be sure,
therefore, to always carry out the
previous steps under "After starting
the engine".