Seating and Safety Restraints 69
Seating 69
Rear seats 78
Safety restraints 80
Child restraints 89
Driving 103
Starting 103
Brakes 110
Air suspension 129
Transmission operation 132
Vehicle loading 146
Roadside Emergencies 152
Hazard flasher switch 153
Fuses and relays 153
Jump starting 162
Wrecker towing 166
Customer Assistance 170
Getting assistance outside the U.S. and Canada 172
Reporting safety defects (U.S. only) 174
Reporting safety defects (Canada only) 174
Cleaning 175
Underbody preservation 179
Maintenance and Specifications 181
Hood 189
Engine oil 192
Battery 195
Engine coolant 197
Fuel information 204
Diesel Exhaust Fluid (DEF) 210
Wheel lug nut torque 237
Tire information 238
Lubricant specifications 245
Refill capacities 259
Engine data 262
Table of Contents
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WARNING:Exercise great caution when working on vehicle
equipped with an automatic fan clutch. The fan starts in motion
only after the engine coolant reaches a predetermined temperature or
the refrigerant pressure (if equipped with air conditioning) reaches a
predetermined setting. The fan starts at this point with no advance
warning. Never reach near, or permit objects to protrude into, the fan
blade radius while the engine is running as this could result in vehicle
damage, personal injury or death.
Engine starting (parking brake applied)
Safety/Emergency
equipmentBefore entering the cab, verify that the vehicle is
equipped with spare electrical fuses (if used),
three red reflective triangles, a properly charged
and rated fire extinguisher and wheel chocks.
Walk around the vehicle and verify all steps and
grab handles, inside and out as well as behind,
are tight and clean. Use extreme caution and a
three-point stance at all times. Inspect door
latches for positive closing, latching and locking.
Starting the
engineSet the parking brake, press the clutch (if
equipped with a manual transmission) and verify
the transmission is in neutral. Vehicles equipped
with an automatic transmission should be in N
(Neutral) or P (Park) (if equipped with a park
position).
Diesel engine:Turn the key to the on position;
when the
light in the instrument cluster
turns off, turn the key to start.
Gas engine:Turn the key to start, then release
it as soon as the engine starts.
Oil pressureVerify engine oil pressure builds to normal
operating range.
Vehicle Inspection Guide
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Diesel particulate filter (diesel
engine only):Illuminates when the
soot level in the DPF has reached a
point where it requires operator
assistance. Refer toDiesel
particulate filterin the
Maintenance and Specifications
chapter and your engine operator’s
manual, for more details.
Do not shift (Allison automatic
transmission only):Illuminates
while driving if a problem has been
detected and shifting may be
restricted. Depending upon the
severity of the problem, the
read-out digit on the shifter display
may be blank. Operation may
continue in order to reach service assistance. The ECU may not respond
to shift selector requests, since operating limitations are being placed on
the transmission, i.e. upshifts and downshifts may be restricted.
Direction changes do not occur.
Refer to your transmission operator’s manual for more information.
Electronic locking differential
(if equipped):Displays when using
the electronic locking differential.
Engine oil pressure (gasoline
engine only):Illuminates when
engine oil pressure is low.
High beams:Illuminates when the
high-beam headlamps are turned on.
Instrument Cluster
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1. Ensure headlamps and all electrical accessories are turned off, the
parking brake is applied and the transmission is in the neutral position
(or P [Park], if equipped).
2. Turn the key to the on position, but do not start the engine.
In cooler weather, the air intake heater may activate the
light. If
the
light illuminates,do notcrank the engine until it goes off.
WARNING:If equipped with an air intake heater, DO NOT use
ether or any other starting fluids. The use of starting fluids
(ether) in an engine equipped with an air intake heater could cause an
explosion and result in property damage and/or personal injury.
3. When the
light turns off, turn the key to the start position;
when the engine starts, release the key.
If the engine does not start after 30 seconds of cranking, allow two
minutes for the starter to cool before trying again. Excessive cranking
may damage the starter.
After the engine starts:
•On some engines, the
light should illuminate after the engine
starts. Allow the engine to idle about three minutes or until the engine
coolant temperature gauge begins to rise. Maintain idle speed until
the
light turns off to indicate the air intake heater has shut off
(approximately six minutes); operating the engine at higher speeds
reduces the effectiveness of the air inlet heater.
•Do not increase engine speed until the oil pressure gauge indicates
normal pressure (as indicated by the arrows); this should be indicated
on the gauge within 15 seconds after starting.
•Idle the engine for three to five minutes before operating with a full
load.
•Try to limit engine idle to 10 minutes; excessive idling reduces fuel
economy.
•When starting a cold engine, increase the engine RPM slowly to make
sure adequate lubrication is available to the bearings.
Starting the engine (gasoline engine only)
Engine starting is controlled by the powertrain control system.
This system meets all Canadian interference-causing equipment standard
requirements regulating the impulse electrical field strength of radio noise.
Driving
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may be limited and your vehicle may stall. Water may also enter your
engine’s air intake and severely damage your engine, drive axles or the
transmission (through the breather ports).
Once through the water, always dry the brakes by moving your vehicle
slowly while applying light pressure on the brake pedal. Wet brakes do
not stop the vehicle as quickly as dry brakes.
ENGINE AUTOMATIC SHUTDOWN WARNING LIGHT OR CHIME
(IF EQUIPPED)
This feature illuminates a light in the instrument cluster and/or sounds a
chime indicating that the engine is being shut down in the event of high
coolant temperature, low engine oil pressure, high diesel particulate filter
soot loading or low engine coolant level. In the event any of these
conditions exist, the engine automatically shuts down.
If the engine shuts down, it can be restarted and operated for
30 seconds at a time or until the problem is corrected. Do not attempt to
use this restarting feature to drive the vehicle very far as serious engine
damage could result.
WARNING:In the event of engine shutdown, make sure the
vehicle is safely off the road and the problem is remedied prior
to returning to the road. Failure to remove the vehicle from the road
could result in an accident, causing serious injury or death.
GENERAL BRAKE INFORMATION
All standard equipment brakes are designed to be self-adjusting.
Automatic adjustment, when required, occurs whenever the brakes are
applied and released during forward or reverse operation. Refer to the
Scheduled Maintenance Guidechapter for scheduled maintenance.
Occasional brake noise is normal and often does not indicate a performance
concern with the vehicle’s brake system. In normal operation, automotive
brake systems may emit occasional or intermittent squeal or groan noises
when the brakes are applied. Such noises are usually heard during the first
few brake applications in the morning; however, they may be heard at any
time while braking and can be aggravated by environmental conditions
such as cold, heat, moisture, road dust, salt or mud. If a “metal-to-metal,”
“continuous grinding” or “continuous squeal” sound is present while
braking, the brake linings may be worn-out and should be inspected by a
qualified service technician.
Know the required stopping distances for all driving conditions that may
be encountered. For longer brake lining life, take full advantage of engine
braking power when coming to a stop.
Driving
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Fuse/Relay
locationFuse amp
ratingFuse description
15 10A Interior lamp relay
16 15A High beams, Indicator
17 — Not used
18 5A Dimmer switch, Interior lighting
19 15A Engine control (diesel engine only)
20 5A Starting system
21 10A DRL resistor
22 15A Air horn, Air suspension dump, Two-speed
axle, Driver-controlled locking differential
23 10A Flasher relay
24 15A Hydraulic brakes relay, Fuel heater relay
(diesel engine only), Air dryer
25 10A Blower motor relay coil
26 10A Right-hand low beam headlight
27 — Not used
28 10A Left-hand low beam headlight
29 10A Cluster, GEM
30 15A Allison electronic transmission
31 15A Mirror fold relay
Relay 1 — Interior lamps
Relay 2 — Not used
Relay 3 — Horn
Relay 4 — Not used
Relay 5 — Not used
Roadside Emergencies
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The engine speed may increase slightly. To allow parked regeneration to
continue uninterrupted:
1. The vehicle must remain parked
2. The transmission must remain in P (Park) or N (Neutral) (as
previously described in Step 2).
3. The accelerator pedal, service brake pedal, and clutch pedal (if
equipped) must not be pressed
4. The parking brake must remain set
On average (depending on filter level and other factors), the process takes
20–30 minutes to complete. The DPF lamp turns off when the process is
complete. Repeat Steps 1–5, if parked regeneration is interrupted.
To discontinue parked regeneration
Press any of the floor pedals to discontinue parked regeneration.
Diesel particulate filter maintenance and service
The DPF is designed to retain a relatively large amount of residual ash
and provide many miles and hours of maintenance-free operation. At
some point, generally beyond 150,000 miles (240,000 km) or 5,000 hours
of operation (whichever comes first), the DPF requires professional
cleaning to remove the accumulated ash.
The exact number of miles or hours of operation varies greatly depending
upon vehicle/engine loading and operating conditions, ash content of the
engine oil, and quality of the diesel fuel used in your truck. Adhering to
your engine manufacturer’s recommended oil and fuel specifications
maximizes the miles and hours of operation before a DPF professional
cleaning is required. Refer to your engine manufacturer’s owner’s manual for
more details regarding recommended maintenance and service of your DPF.
Exhaust outlet assembly
WARNING:The normal operating temperature of the exhaust
system is very high. Never work around or attempt to repair any
part of the exhaust system until it has cooled. Failure to follow these
instructions may result in serious personal injury.
The exhaust outlet assembly on your vehicle is a uniquely functioning
device that accompanies the DPF assembly. It is designed to help control
the temperature of the exhaust during the DPF regeneration process.Do
not modify or remove this device. Modification of the system
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and/or additions of aftermarket devices can reduce the
effectiveness of the system, as well as cause damage to the
exhaust system and/or engine. Any modifications may also
invalidate the vehicle and/or engine warranties. See the vehicle
and engine warranty guides for more information.
The inlet holes in the side of the assembly are functional. These holes
allow outside air to be drawn into the outlet assembly. The holes need to
be kept clear of mud and other foreign material to maintain proper
functionality of the system. One way to keep the holes clear is to spray
the outlet assembly with a hose when washing the vehicle. Failure to
keep the functional holes clear of foreign material may result in the holes
becoming blocked or plugged.Blocked/plugged holes or
modification/removal of the outlet assembly could result in
elevated exhaust temperatures which may result in
vehicle/property damage and/or personal injury.
NOISE EMISSIONS – EXTERIOR
In order to comply with the federal exterior noise regulations, your
vehicle may be equipped with noise emission items. Depending on the
vehicle configuration, it may have all or some of the following items:
Air Intake System:Inspect air cleaner; do not alter its location. Do not
alter inlet and outlet piping.
Body:Inspect wheel well splash shields, cab shields and underhood
insulation for deterioration, dislocation and orientation.
Cooling System:
•Inspect fan for damage to blades; if damaged, replace with the
recommended parts. Inspect for fan-to-shroud interference and any
damage to shroud such as cracks and holes.
•Do not change fan ratio or alter fan spacer dimensions and positions.
•Inspect fan clutch for proper operation; make sure the fan is
disengaged when cooling of the engine is not required.
•Inspect radiator shutters (if equipped) for proper operation; the
shutters should be open during normal operating temperatures.
Engine:Valve covers and block covers are made to damp-out engine
mechanical noise and, if needed, should be replaced with recommended
parts. Check for mechanical isolations.
Transmission Enclosure:Inspect for cracks, holes and tears. Clean any
deposits such as oil, dirt and stones.
Maintenance and Specifications
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