Engine Compartment (with Engine Stopped)
Engine OilUse the dipstick to verify the oil level is in the
proper operating range. SeeEngine oil checkin
theMaintenancechapter.
Engine CoolantLook through the plastic reservoir or the clear
sight glass on the reservoir (depending upon
vehicle equipment) and verify the coolant level is
within the proper operating range.Do not
remove the pressure cap until the coolant
has cooled.SeeEngine coolant checkin the
Maintenancechapter.
Power Steering
FluidVerify that the fluid level is in the proper
operating range. SeePower steering fluid check
in theMaintenancechapter.
Brake FluidRemove the master cylinder caps and inspect the
fluid level. SeeBrake fluid checkin the
Maintenancechapter.
Clutch FluidRemove the cap and inspect the fluid level. See
Clutch fluid and linkagein theMaintenance
chapter.
Belts (Fan,
Alternator, Water
Pump and A/C
Compressor)Inspect for glazing, fraying or cracking. There
should be no more than 5-7 cracks per rib, per
inch (2.5 cm).
Fluid LeaksInspect for signs of fluid puddles or dripping fluid
on the ground under the engine, or the underside
of the engine.
HVAC Air InletInspect for debris that may have collected on the
HVAC air inlet grille or inside the exterior module
as this may reduce system performance.
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Front Wheels
RimsInspect for damaged or bent rims. They should
not have welding repairs, and there should be no
rust trails that indicate it is loose on the wheel.
Lug NutsVerify all lug nuts are present and not loose (look
for rust trails around the lug nuts). There should
be no cracks radiating from the lug bolt holes or
distortion of the bolt holes.
Hub Oil SealsInspect wheel hub oil seal for leaks and, if sight
glass if present, verify the oil level is adequate.
Oil-lubricated
Front Wheel
BearingsInspect for proper lubrication level if the hubcap
has a transparent window. If the hubcap does not
have a transparent window, remove the rubber
fill-plug and inspect for proper level.
Fuel Area
Fuel Tank(s)Verify:
•tank(s) and cap(s) are secure
•there is no damage to the tank(s).
LeaksInspect for leaks from the tank(s).
Diesel Exhaust Fluid (DEF) Area
DEF TanksVerify:
•tanks and caps are secure
•there is no damage to the tanks.
LeaksInspect for leaks from the tanks.
Underbody
DriveshaftVerify:
•the driveshaft is not bent or cracked
•all driveshaft couplings are secure.
Exhaust SystemVerify:
•the visible outside parts are securely mounted
•there are no cracks, holes or severe dents.
Frame•Inspect for cracks or bends in longitudinal
frame members.
•Verify there are no loose, cracked, bent, broken
or missing crossmembers or crossmember
fasteners.
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GAUGES - DIESEL ENGINE
Cluster shown in standard measure. Metric similar.
A. Engine oil pressure gauge
B. Engine coolant temperature gauge
C. Diesel exhaust fluid (DEF) gauge
D. Fuel gauge
E. Speedometer
F. Information display. See theInformation Displayschapter for more
information.
G. Tachometer
Engine Oil Pressure Gauge
Indicates engine oil pressure. The needle should stay in the normal
operating range. If the needle falls below the normal range, stop the
vehicle, turn off the engine and check the engine oil level. Add oil if
needed. If the oil level is correct, have your vehicle checked at your
authorized dealer.
A
GFE
BCD
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GAUGES - GASOLINE ENGINE
Cluster shown in standard measure. Metric similar.
A. Engine oil pressure gauge
B. Engine coolant temperature gauge
C. Transmission fluid temperature gauge
D. Fuel gauge
E. Speedometer
F. Information display. See theInformation Displayschapter for more
information.
G. Tachometer
Engine Oil Pressure Gauge
Indicates engine oil pressure. The needle should stay in the normal
operating range. If the needle falls below the normal range, stop the
vehicle, turn off the engine and check the engine oil level. Add oil if
needed. If the oil level is correct, have your vehicle checked at your
authorized dealer.
ABCD
GFE
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Diesel Exhaust Fluid (diesel engine only)
It illuminates when the diesel exhaust fluid level falls below
0.5 gallons (1.9L) in the five gallon (19.0L) tank or one gallon
(3.8L) in the nine gallon (34.0L) tank. Refill the tank or, at a
minimum, add at least one gallon (3.8L) to the five gallon (19.0L) tank
or two gallons (7.6L) to the nine gallon (34.0L) tank.
Diesel Particulate Filter (diesel engine only)
It illuminates when the soot level in the diesel particulate filter
has reached a point where it requires operator assistance. See
Diesel particulate filterin theMaintenancechapter, and your
engine operator’s manual, for more details.
Do Not Shift (Allison automatic transmission only)
It illuminates while driving if a problem has been detected in
the transmission; shifting may be restricted. Depending on the
severity of the problem, the shifter’s digital read-out may turn
blank.
Operation may continue in order to reach service assistance. The control
unit 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.
Direction Indicator
It illuminates when the left or right turn signal or the hazard
warning flasher is switched on. If the indicators stay on or flash
faster, check for a burned out bulb.
Electronic Locking Differential
It illuminates when using the electronic locking differential.
Engine Oil Pressure (gasoline engine only)
It illuminates when engine oil pressure is low.
Fasten Safety belt
It illuminates and a chime sounds to remind you to fasten your
safety belt.
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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.
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 150000 miles (240000 kilometers) or
5000 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 and 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. See 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.
Note:Do not modify or remove this device. Modification of the system
or additions of aftermarket devices can reduce the effectiveness of the
system, as well as cause damage to the exhaust system or engine. Any
modifications may also invalidate the vehicle and/or engine warranties.
See your warranty information.
Note:Blocked or plugged holes or modification to, or removal of, the
outlet assembly could result in elevated exhaust temperatures which may
result in vehicle or property damage or personal injury.
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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.
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.
SWITCHING OFF A DIESEL ENGINE
Allow the engine to idle for three to five minutes before shutting it
down; the larger the engine, the greater the need for this idling period.
Note:Try to limit engine idle to 10 minutes. Excessive idling reduces
fuel economy.
ENGINE AUTOMATIC SHUTDOWN (IF EQUIPPED)
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.
This feature either illuminates a light in the instrument cluster or sounds
a chime (or both) 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.
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Cooling System:
•Inspect the fan for blade damage. If damage is found, 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.
Exhaust System:
•Inspect for leaks at various joint connections and loose clamps.
•Perform a visual inspection for cracks or holes in the muffler and tail
pipe.
•Always use the recommended parts when items need to be replaced.
•Do not change the tail pipe elbow or offset tail pipe orientation from
the standard position as originally received.
•To avoid abnormal changes in vehicle sound levels, it is necessary for
the owner to perform inspections and necessary maintenance at the
intervals shown in theScheduled Maintenancechapter.
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