is located underneath the truck, by the forward stake pocket on the left
side of the bed. If operating the air system in dusty areas, periodically
inspect this filter and replace it if found to be clogged or damaged, or if
the time needed to pressurize the system starts to become extended.
Using the air system to fill tires
To fill your tires, first be sure to stop the truck in a safe place. You
should be far enough off the road that passing traffic will not be a danger
to you. You should have an accurate tire pressure gauge to measure the
pressure in the tires and inflate them to the settings on the tire pressure
placard, which is usually inside the door on the truck.
Remove the air hose from under the clamp on the floor of the truck.
Attach the connector end of the hose to the coupling in the trim panel
behind the driver's seat by using one hand to slide the coupling collar
toward the trim panel and the other to insert the fitting on the end of
the hose into the coupling. When the fitting is seated in the coupling,
slide the collar back to its original position.
Extend the hose to reach the tire needing air. Remove the cap from the
tire valve stem and attach the clamp-on air chuck by squeezing the
locking mechanism while placing the chuck over the valve stem. Release
the locking mechanism when the air chuck is seated on the stem. Air will
flow from the system to the tire until you remove the chuck. Be sure to
use your gauge to set the pressure according to the placard. When the
tire pressure is correct, disconnect the hose and re-stow it under the
clamp on the floor behind the passenger seat. Do not forget to re-install
the cap on the valve stem.
CENTRAL TIRE INFLATION SYSTEM (CTIS) (IF EQUIPPED)
Your vehicle may be equipped with a
Central Tire Inflation System
(CTIS). The CTIS adjusts and
maintains tire pressure for enhanced
vehicle traction, reduced vehicle
maintenance and improved driver
comfort. The system is operated
through instrument panel-mounted
controls.
Operating the CTIS
The CTIS is operated and observed through the Driver Display Module
(DDM) and the LOAD AND TERRAIN controls.
Tires, Wheels and Loading
23
Maximum
Speed -
mph
(km/h)Load Front Pressure Rear Pressure
Highway
65 (105) +
Unloaded*55 psi @ 2500 lbs 37 psi @1550 lbs
Maximum
Load57 psi @ 2600 lbs 65 psi @ 3195 lbs
Cross
Country30 (48)Unloaded*37 psi @ 2500 lbs 21 psi @ 1550 lbs
Maximum
Load40 psi @ 2600 lbs 35 psi @ 3195 lbs
Mud,
Sand and
Snow10 (16)Unloaded*24 psi @ 2500 lbs 15 psi @ 1550 lbs
Maximum
Load27 psi @ 2600 lbs 29 psi @ 3195 lbs
Emergency
5 (8)Unloaded*
17 psi @ 2500 lbs 12 psi @ 1550 lbs
Maximum
Load20 psi @ 2600 lbs 23 psi @ 3195 lbs
* Under 800 lbs (363 kg) people plus cargo
LOAD
Allows the driver to select loaded or
unloaded tire pressures under
specified conditions. Selecting the
load setting will cause the system to
run a pressure check and adjust tire
pressure appropriately. The LOAD
setting can be changed any time
(within specified speed/load
limitations).
Automatic load sensing
²Vehicle load condition will be automatically sensed and tire pressure
adjusted, if necessary, when starting the engine and when the vehicle
is at a complete stop.
²Unloaded/Loaded tire pressures are available for each terrain
selection.
²Anytime the load can't be accurately sensed, the system will default to
the loaded tire pressure.
²Load settings are indicated by the bar graph on the DDM.
Tires, Wheels and Loading
26
