Ford 2003 Expedition v.2 Manuel d'utilisateur télécharger pdf (Page 231)

Control Trac four–wheel drive system

When a four–wheel drive mode is selected, the Control Trac system uses

all four wheels to power the vehicle. This increases traction, enabling

you to drive over terrain and road conditions that a conventional

two-wheel drive vehicle cannot.

Power is supplied to all four wheels

through a transfer case. On

four–wheel drive vehicles, the

transfer case allows you to select

four–wheel drive when necessary.

Information on transfer case

operation and shifting procedures

can be found in this chapter.

Information on transfer case maintenance can be found in the

Maintenance and specifications chapter. You should become

thoroughly familiar with this information before you operate your vehicle.

Normal characteristics

On some four–wheel drive models, the initial shift from two-wheel drive

to four–wheel drive while the vehicle is moving can cause some

momentary clunk and ratcheting sounds. This is the front drivetrain

coming up to speed and engaging the front wheels, and is not cause for

concern.

Sand

When driving over sand, try to keep all four wheels on the most solid

area of the trail. Avoid reducing the tire pressures but shift to a lower

gear and drive steadily through the terrain. Apply the accelerator slowly

and avoid spinning the wheels.

If you must reduce the tire pressure for whatever reason in sand, make

sure you re-inflate the tires as soon as possible.

Avoid excessive speed because vehicle momentum can work against you

and cause the vehicle to become stuck to the point that assistance may

be required from another vehicle. Remember, you may be able to back

out the way you came if you proceed with caution.

If your vehicle is equipped with AdvanceTrac娂, press the AdvanceTrac娂

button (refer to AdvanceTrac娂 Stability Enhancement System in this

chapter) while driving in deep sand if you experience excessive engine

power reduction.

Driving

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Ford 2003 Expedition v.2 Manuel d'utilisateur Page 231