2017 FORD F450 SUPER DUTY traction control

LIMITED SLIP DIFFERENTIAL
This axle provides added traction onslippery surfaces, particularly when onewheel is on a poor traction surface. Undernormal conditions, the limited-slip axlefunctions like a standard rear axle. The axlemay exhibit a slight noise or vibrationduring tight turns with low vehicle speed.This is normal behavior and indicates theaxle is working.
ELECTRONIC LOCKING
DIFFERENTIAL (If Equipped)
Note:The electronic locking differential isfor off-road use only and is not for use ondry pavement. Using the electronic lockingdifferential on dry pavement will result inincreased tire wear, noise and vibration.
The electronic locking differential is adevice housed in the rear axle that allowsboth rear wheels to turn at the samespeed. The electronic locking differentialcan provide additional traction should yourvehicle become stuck. You can activatethe differential electronically and shift iton the fly within the differential operatingspeed range. The differential is for use inmud, rocks, sand, or any off-road conditionwhere you need maximum traction. It isnot for use on dry pavement.
The following conditions will affect theelectronic locking differential:
•The electronic locking differential willnot engage if your vehicle speed isabove 20 mph (32 km/h) in 4x2, 4x4Auto, or 4x4 High modes.
•The electronic locking differential willnot engage if your vehicle speed isabove or 56 mph (90 km/h) in 4X4Low.
•The electronic locking differential maynot engage if you press youraccelerator pedal during anengagement attempt. A message maydisplay in the instrument displayguiding you to release the acceleratorpedal.
•In 4x2, 4x4 Auto, and 4x4 High modes,the electronic locking differential willautomatically disengage at speedsabove 25 mph (41 km/h) and willautomatically reengage at speedsbelow 20 mph (32 km/h).
•In 4L (4X4 low), the electronic lockingdifferential will automaticallydisengage at speeds above 62 mph(100 km/h) and will automaticallyreengage at speeds below 56 mph(90 km/h).
•The AdvanceTrac system has theability to take over control of theelectronic locking differential anddisable it during driving maneuverswhen necessary.
When you switch the system on, if you donot meet the required conditions forelectronic locking differential activation,the instrument cluster will display theappropriate information guiding youthrough the proper activation process.
Activating the Electronic LockingDifferential
Note:Do not use electronic lockingdifferential on dry, hard surfaced roads.Doing so will produce excessive noise,vibration and increase tire wear.
Note:If the electronic locking differentialhas difficulty disengaging, release theaccelerator pedal and turn the steeringwheel in the opposite direction while rolling.
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Rear Axle

For 4WD vehicles
Pull the 4WD control knob toward you.
For 2WD vehicles
Turn the control to ON.
Once the indicator lightilluminates in the informationdisplay, both rear wheel axleshafts will be locked together providingadded traction.
If the indicator does not come on, or theindicator turns off while driving, one of thefollowing has occurred:
•The vehicle speed is too high.
•The left and right rear wheel speeddifference is too high during anengagement attempt.
•The system has malfunctioned and isaccompanied by CHECK LOCKINGDIFFERENTIAL in the informationdisplay. See your authorized Forddealer for assistance.
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PRINCIPLE OF OPERATION
The traction control system helps avoiddrive wheel spin and loss of traction.
If your vehicle begins to slide, the systemapplies the brakes to individual wheelsand, when needed, reduces engine powerat the same time. If the wheels spin whenaccelerating on slippery or loose surfaces,the system reduces engine power in orderto increase traction.
USING TRACTION CONTROL
WARNING
The stability and traction controllight illuminates steadily if thesystem detects a failure. Make sureyou did not manually disable the tractioncontrol system using the informationdisplay controls or the switch. If thestability control and traction control lightis still illuminating steadily, have thesystem serviced by an authorized dealerimmediately. Operating your vehicle withthe traction control disabled could lead toan increased risk of loss of vehicle control,vehicle rollover, personal injury and death.
The system automatically turns on eachtime you switch the ignition on.
If your vehicle is stuck in mud or snow,switching traction control off may bebeneficial as this allows the wheels to spin.
Note:When you switch traction control off,stability control remains fully active.
Note:For additional information on thetraction and stability control systems. SeeUsing Stability Control (page 227).
Switching the System Off
When you switch the system off or on, amessage appears in the informationdisplay showing system status.
Use the traction and stability controlswitch on the instrument panel to switchthe system off or on.
The switch illuminates when tractioncontrol is off.
When you place your vehicle intofour-wheel drive low mode the tractioncontrol disables. Traction control resumesfull operation when you put your vehicleback into two-wheel drive mode.
System Indicator Lights andMessages
The stability and traction controllight:
•Temporarily illuminates on enginestart-up.
•Flashes when a driving conditionactivates either of the systems.
•Illuminates if a problem occurs in eitherof the systems.
The stability and traction controloff light temporarily illuminateson engine start-up and stays onwhen you switch the traction controlsystem off.
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PRINCIPLE OF OPERATION
WARNINGS
Vehicle modifications involvingbraking system, aftermarket roofracks, suspension, steering system,tire construction and wheel and tire sizemay change the handling characteristicsof your vehicle and may adversely affectthe performance of the electronic stabilitycontrol system. In addition, installing anystereo loudspeakers may interfere withand adversely affect the electronic stabilitycontrol system. Install any aftermarketstereo loudspeaker as far as possible fromthe front center console, the tunnel, andthe front seats in order to minimize the riskof interfering with the electronic stabilitycontrol sensors. Reducing theeffectiveness of the electronic stabilitycontrol system could lead to an increasedrisk of loss of vehicle control, vehiclerollover, personal injury and death.
Remember that even advancedtechnology cannot defy the laws ofphysics. It’s always possible to losecontrol of a vehicle due to inappropriatedriver input for the conditions. Aggressivedriving on any road condition can causeyou to lose control of your vehicleincreasing the risk of personal injury orproperty damage. Activation of theelectronic stability control system is anindication that at least some of the tireshave exceeded their ability to grip the road;this could reduce the operator’s ability tocontrol the vehicle potentially resulting ina loss of vehicle control, vehicle rollover,personal injury and death. If your electronicstability control system activates, SLOWDOWN.
The system automatically turns on eachtime you switch the ignition on.
If a fault occurs in either the stabilitycontrol or the traction control system, youmay experience the following conditions:
•The stability and traction control lightilluminates steadily.
•The stability control and tractioncontrol systems do not enhance yourvehicle's ability to maintain traction ofthe wheels.
•The Adaptive Steering system (ifequipped) automatically changes thesteering function to a fixed steeringratio. See Steering (page 256).
If a driving condition activates either thestability control or the traction controlsystem you may experience the followingconditions:
•The stability and traction control lightflashes.
•Your vehicle slows down.
•Reduced engine power.
•A vibration in the brake pedal.
•The brake pedal is stiffer than usual.
•If the driving condition is severe andyour foot is not on the brake, the brakepedal may move as the system applieshigher brake force.
The stability control system has severalfeatures built into it to help you maintaincontrol of your vehicle:
Electronic Stability Control
The system enhances your vehicle’s abilityto prevent skids or lateral slides byapplying brakes to one or more of thewheels individually and, if necessary,reducing engine power.
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Stability Control

Roll Stability Control
The system enhances your vehicle’s abilityto prevent rollovers by detecting yourvehicle’s roll motion and the rate at whichit changes by applying the brakes to oneor more wheels individually.
Traction Control
The system enhances your vehicle’s abilityto maintain traction of the wheels bydetecting and controlling wheel spin. SeeUsing Traction Control (page 225).
Vehicle without stability controlskidding off its intended route.A
Vehicle with stability controlmaintaining control on a slipperysurface.
B
USING STABILITY CONTROL
AdvanceTrac® with Roll StabilityControl™ (RSC®)
The system automatically turns on eachtime you switch the ignition on.
The electronic stability control and rollstability control portions of the system canbe turned off.
When you shift the transmission intoreverse R, the systems disable.
Use the traction and stabilitycontrol switch on the instrumentpanel to switch the systems offor on.
You can switch the traction control portionof the system off independently.
If you cannot turn the systems off, see theMyKey chapter for more information.
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AdvanceTrac with RSC Features
Tractioncontrol systemElectronicstabilitycontrol
Roll stabilitycontrolStabilitycontrol lightButton func-tions
EnabledEnabledEnabledIlluminatedduring bulbcheck
Default at start-up
DisabledEnabled1EnabledIlluminatedButton pressedmomentarily
DisabledDisabledDisabledilluminated3Button pressedand held formore than 5seconds
Enabled2Enabled 1EnabledIlluminatedDouble Press(Pickup Only)
EnabledEnabledEnabledNot illuminatedButton pressedagain afterdeactivation
DisabledDisabledDisabledIlluminatedTransfer caseswitched to
4WD Low 4
1Electronic stability control has reduced sensitivity compared to fully active system.2Traction control has reduced sensitivity compared to fully active system.3Lamp light starts blinking for four seconds after entering the press and hold state.4Engaging 4WD Low automatically disables roll stability control, electronic stability controland the traction control systems.
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Stability Control

•Fuel economy may decrease with lowertemperatures during the first 8–10miles (12–16 kilometers) of driving.
•Driving on flat terrain offers improvedfuel economy as compared to drivingon hilly terrain.
•Transmissions give their best fueleconomy when operated in the topcruise gear and with steady pressureon the gas pedal.
•Four-wheel-drive operation (ifequipped) is less fuel efficient thantwo-wheel-drive operation.
•Close the windows for high-speeddriving.
DRIVING THROUGH WATER
WARNING
Do not drive through flowing or deepwater as you may lose control of yourvehicle.
Note:Driving through standing water cancause vehicle damage.
Note:Engine damage can occur if waterenters the air filter.
Before driving through standing water,check the depth. Never drive through waterthat is higher than the bottom of the wheelhubs.
When driving through standing water, drivevery slowly and do not stop your vehicle.Your brake performance and traction maybe limited. After driving through water andas soon as it is safe to do so:
•Lightly press the brake pedal to dry thebrakes and to check that they work.
•Check that the horn works.
•Check that the exterior lights work.
•Turn the steering wheel to check thatthe steering power assist works.
FLOOR MATS
WARNINGS
Always use floor mats that aredesigned to fit the foot well of yourvehicle. Only use floor mats thatleave the pedal area unobstructed. Onlyuse floor mats that are firmly secured toretention posts so that they cannot slip outof position and interfere with the pedalsor impair safe operation of your vehicle inother ways.
Pedals that cannot move freely cancause loss of vehicle control andincrease the risk of serious personalinjury.
Always make sure that the floormats are properly attached to theretention posts in the carpet that aresupplied with your vehicle. Floor mats mustbe properly secured to both retention poststo make sure mats do not shift out ofposition.
Never place floor mats or any othercovering in the vehicle foot well thatcannot be properly secured toprevent them from moving and interferingwith the pedals or the ability to control thevehicle.
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TIRE CARE
Information About UniformTire Quality Grading
Tire Quality Grades apply to newpneumatic passenger car tires.The Quality grades can be foundwhere applicable on the tiresidewall between tread shoulderand maximum section width. Forexample: Treadwear 200Traction AA Temperature A.
These Tire Quality Grades aredetermined by standards that theUnited States Department ofTransportation has set.
Tire Quality Grades apply to newpneumatic passenger car tires.They do not apply to deep tread,winter-type snow tires,space-saver or temporary usespare tires, light truck or LT typetires, tires with nominal rimdiameters of 10 to 12 inches orlimited production tires as definedin Title 49 Code of FederalRegulations Part 575.104 ©)(2).
U.S. Department ofTransportation Tire qualitygrades: The U.S. Department ofTransportation requires FordMotor Company to give you thefollowing information about tiregrades exactly as the governmenthas written it.
Treadwear
The treadwear grade is acomparative rating based on thewear rate of the tire when testedunder controlled conditions on aspecified government test course.For example, a tire graded 150would wear one and one-half (1½) times as well on thegovernment course as a tiregraded 100. The relativeperformance of tires depends
upon the actual conditions of theiruse, however, and may departsignificantly from the norm due tovariations in driving habits, servicepractices, and differences in roadcharacteristics and climate.
Traction AA A B C
WARNING
The traction grade assignedto this tire is based onstraight-ahead braking tractiontests, and does not includeacceleration, cornering,hydroplaning or peak tractioncharacteristics.
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