ignition FORD EXPLORER 2021 Repair Manual

PRINCIPLE OF OPERATION
This system is a proactive system. It has
the ability to anticipate wheel slip and
transfer torque to the front wheels before
slip occurs. Even when wheel slip is not
present, the system is continuously
adjusting to the torque distribution, in an
attempt to improve straight line and
cornering behavior, both on and off road.
The system automatically turns on every
time you switch the ignition on.
If any component requires maintenance,
a message appears in the information
display.
USING FOUR-WHEEL DRIVE
WARNING: Vehicles with a higher
center of gravity (utility and four-wheel
drive vehicles) handle differently than
vehicles with a lower center of gravity
(passenger cars). Avoid sharp turns,
excessive speed and abrupt steering in
these vehicles. Failure to drive cautiously
increases the risk of losing control of your
vehicle, vehicle rollover, personal injury
and death.
The intelligent 4WD system continuously
monitors vehicle conditions and adjusts
the power distribution between the front
and rear wheels. It combines transparent
all-surface operation with highly capable
four-wheel drive.
The 4WD system is always active and
requires no driver input. It is capable of
handling all road conditions including
street and highway driving as well as
off-road and winter driving. You can
optimize more 4WD control by selecting
different drive modes. See
Selecting a
Drive Mode (page 278). Note:
A warning message displays in the
information display when a 4WD system
fault is present. See
Information
Messages (page 121). A 4WD system fault
causes the 4WD system to default to
rear-wheel drive only mode. When this
warning message is displayed, have your
vehicle serviced at an authorized dealer.
Note: A warning message displays in the
information display if the 4WD system
overheats. See
Information Messages
(page 121). This condition could occur if the
vehicle is operated in extreme conditions
with excessive wheel slip, such as deep
sand. To resume normal 4WD function as
soon as possible, stop the vehicle in a safe
location and stop the engine for at least 10
minutes. After the engine is restarted and
the 4WD system is adequately cooled, the
warning message turns off and normal 4WD
function returns.
Operating Four-Wheel Drive (4WD)
Vehicles With Spare Tires
Do not use a different size spare tire other
than the tire provided. If the mini-spare tire
is installed, the 4WD system will disable
and enter rear-wheel drive only mode to
protect driveline components. Some
limited 4WD traction could be provided if
the mini-spare is installed on one of the
front wheels. If you are in driving conditions
where limited 4WD traction is needed
while the mini-spare is installed, it is
recommended the mini-spare be installed
on the front axle.
See Information
Messages (page 121).
If the mini-spare is installed, this condition
is indicated by a warning in the information
display. If there is a warning message in
the information display from using the
spare tire, this indicator should turn off
after reinstalling or replacing the normal
road tire and cycling the ignition off and
on. We recommended reinstalling or
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(If Equipped)

Driving in Special Conditions With
Four-Wheel drive (4WD)
Note:
Use of the 4WD system in slippery,
deep snow, and sand drive modes on dry
surfaces could produce some vibration,
driveline bind up, or excessive tire wear as
these drive modes are intended for slippery
and loose surfaces.
Note: The design of 4WD vehicles are for
driving on sand, snow, mud and rough roads
and have operating characteristics that are
somewhat different from conventional
vehicles, both on and off the highway.
Basic Operating Principles in Special
Conditions
• Drive slower in strong crosswinds which
can affect the normal steering
characteristics of your vehicle.
• Be extremely careful when driving on
pavement made slippery by loose sand,
water, gravel, snow or ice. If Your Vehicle Goes Off the Edge of the
Pavement
•
If your vehicle goes off the edge of the
pavement, slow down, but avoid severe
brake application, ease the vehicle
back onto the pavement only after
reducing your speed. Do not turn the
steering wheel too sharply while
returning to the road surface.
• It could be safer to stay on the apron
or shoulder of the road and slow down
gradually before returning to the
pavement. You could lose control if you
do not slow down or if you turn the
steering wheel too sharply or abruptly.
• It often could be less risky to strike
small objects, such as highway
reflectors, with minor damage to your
vehicle rather than attempt a sudden
return to the pavement which could
cause the vehicle to slide sideways out
of control or rollover. Remember, your
safety and the safety of others should
be your primary concern.
If Your Vehicle Gets Stuck WARNING: Apply the parking
brake, shift into park (P), switch the
ignition off and remove the key before
you leave your vehicle. Failure to follow
this instruction could result in personal
injury or death. WARNING:
If the parking brake is
fully released, but the brake warning
lamp remains illuminated, the brakes
may not be working properly. Have your
vehicle checked as soon as possible. WARNING:
Do not spin the wheels
at over 34 mph (55 km/h). The tires may
fail and injure a passenger or bystander.
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(If Equipped)

If your vehicle gets stuck in mud or snow
you can rock it out by shifting between
forward and reverse gears, stopping
between shifts, in a steady pattern. Press
lightly on the accelerator in each gear.
If your vehicle comes with AdvanceTrac®
with Roll Stability Control
™, it could be
beneficial to disengage the AdvanceTrac®
with Roll Stability Control ™ system while
attempting to rock the vehicle.
Note: Do not rock the vehicle if the engine
is not at normal operating temperature or
damage to the transmission could occur.
Note: Do not rock the vehicle for more than
a few minutes or damage to the
transmission and tires could occur or the
engine could overheat.
Emergency Maneuvers
• In an unavoidable emergency situation
where a sudden sharp turn must be
made, remember to avoid
"over-driving" your vehicle (for
example, turn the steering wheel only
as rapidly and as far as required to
avoid the emergency). Excessive
steering can result in less vehicle
control, not more. Additionally, smooth
variations of the accelerator and/or
brake pedal pressure should be utilized
if changes in vehicle speed are called for. Avoid abrupt steering, acceleration
or braking which could result in an
increased risk of loss of vehicle control,
vehicle rollover and/or personal injury.
Use all available road surface to return
the vehicle to a safe direction of travel.
• In the event of an emergency stop,
avoid skidding the tires and do not
attempt any sharp steering wheel
movements.
• If the vehicle goes from one type of
surface to another (i.e., from concrete
to gravel) there is a change in the way
the vehicle responds to a maneuver
(steering, acceleration or braking).
Again, avoid these abrupt inputs.
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.
Avoid excessive speed because vehicle
momentum can work against you and
cause the vehicle to become stuck to the
point that assistance could be required
from another vehicle. Remember, you
could be able to back out the way you
came if you proceed with caution.
Mud and Water
If you must drive through high water, drive
slowly. Traction or brake capability could
be limited.
Note: Driving through deep water could
damage your vehicle.
When driving through water, determine the
depth; avoid water higher than the bottom
of the hubs (if possible) and proceed
slowly. If the ignition system gets wet, the
vehicle could stall.
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GENERAL INFORMATION
Note:
Occasional brake noise is normal. If
a metal-to-metal, continuous grinding or
continuous squeal sound is present, the
brake linings may be worn-out and an
authorized dealer should check them. If the
vehicle has continuous vibration or shudder
in the steering wheel while braking, an
authorized dealer should check your vehicle.
Note: Brake dust may accumulate on the
wheels, even under normal driving
conditions. Some dust is inevitable as the
brakes wear and does not contribute to
brake noise. See Cleaning the Wheels
(page 348).
Wet brakes result in reduced braking
efficiency. Gently press the brake pedal a
few times when driving from a car wash or
standing water to dry the brakes.
Brake Over Accelerator
In the event the accelerator pedal
becomes stuck or entrapped, apply steady
and firm pressure to the brake pedal to
slow the vehicle and reduce engine power.
If you experience this condition, apply the
brakes and bring your vehicle to a safe
stop. Switch the engine off, move the
transmission to park (P) and apply the
parking brake. Inspect the accelerator
pedal and the area around it for any items
or debris that may be obstructing its
movement. If none are found and the
condition persists, have your vehicle towed
to the nearest authorized dealer.
Emergency Brake Assist
Emergency brake assist detects when you
brake heavily by measuring the rate at
which you press the brake pedal. It
provides maximum braking efficiency as
long as you press the pedal. Emergency
brake assist can reduce stopping distances
in critical situations. Anti-lock Brake System
This system helps you maintain steering
control during emergency stops by keeping
the brakes from locking. This lamp momentarily
illuminates when you switch the
ignition on or apply the parking
brake. If the light does not illuminate
during start up, remains on or flashes,
except when you switch the ignition on or
apply the parking brake, the anti-lock
braking system may be disabled. Have the
system checked by an authorized dealer.
If the anti-lock brake system is disabled,
normal braking is still effective. See
Warning Lamps and Indicators (page
107).
Note: Indicators vary depending on region. This lamp also illuminates
momentarily when you switch
the ignition on or apply the
parking brake to confirm the
lamp is working. If it does not
illuminate when you switch the
ignition on, apply the parking brake, or if it
begins to flash at any time, have the
system checked by an authorized dealer.
If the brake warning lamp illuminates with
the parking brake released, have the
system checked immediately.
Regenerative Braking System
This feature is used to simulate the engine
braking of an internal combustion engine
and assist the standard brake system while
recovering some of the energy of motion
and storing it in the battery to improve fuel
economy. The standard brake system is
designed to fully stop the car if
regenerative braking is not available.
During regenerative braking, the motor is
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spun as a generator to create electrical
current. This recharges the battery and
slows the vehicle. In effect, once the
accelerator pedal is released, the motor
changes from an energy user to an energy
producer.
When you release the accelerator pedal or
press the brake pedal, the brake controller
automatically detects the amount of
deceleration requested and optimizes how
much of the deceleration will be produced
by regenerative braking. The remaining
portion is generated by standard friction
braking. When the battery is almost fully
charged, the amount of regenerative
braking is limited to avoid overcharging,
and the requested deceleration is
produced by standard friction braking
alone.
Regenerative braking does not take the
place of the standard friction brakes; it only
assists them. Regenerative braking has
also been designed to interact with the
anti-lock brake system. Regenerative
braking is disabled when the anti-lock
brake system is activated or the battery is
fully charged.
HINTS ON DRIVING WITH
ANTI-LOCK BRAKES
The anti-lock braking system does not
eliminate the risks when:
•
You drive too closely to the vehicle in
front of you.
• Your vehicle is hydroplaning.
• You take corners too fast.
• The road surface is poor.
Note: If the system activates, the brake
pedal may pulse and may travel further.
Maintain pressure on the brake pedal. You
may also hear a noise from the system. This
is normal. ELECTRIC PARKING BRAKE WARNING: Always fully apply the
parking brake and make sure you shift
into park (P). Failure to follow this
instruction could result in personal injury
or death. WARNING:
If you drive extended
distances with the parking brake applied,
you could cause damage to the brake
system. WARNING:
The electric parking
brake does not operate if the vehicle
battery is running out of charge.
Your vehicle has an electric parking brake.
You operate it with a switch instead of a
lever. The switch is on the center console
or to the left-hand side of the steering
wheel, on the lower part of the instrument
panel.
Note: The electric parking brake makes
noises during operation. This is normal.
Applying the Electric Parking
Brake Pull the switch upward.
The red warning lamp flashes
during operation and illuminates
when the parking brake is
applied. Note:
It remains illuminated for a short
period of time after you switch the ignition
off.
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If it continues to flash or does not
illuminate, the system has malfunctioned.
Have your vehicle checked as soon as
possible.
Note:
You can apply the electric parking
brake when the ignition is off.
Note: The electric parking brake could
automatically apply when you shift into park
(P). See Transmission (page 201).
Applying the Electric Parking Brake in
an Emergency
Note: Do not apply the electric parking
brake when your vehicle is moving, except
in an emergency. If you repeatedly use the
electric parking brake to slow or stop your
vehicle, you could cause damage to the
brake system.
You can use the electric parking brake to
slow or stop your vehicle in an emergency. Pull the switch upward and hold
it.
The red warning lamp
illuminates, a tone sounds and
the stoplamps turn on.
The electric parking brake continues to
slow your vehicle down unless you release
the switch.
Manually Releasing the Electric
Parking Brake
Switch the ignition on.
Press and hold the brake pedal.
Push the switch downward.
The red warning lamp turns off. If it remains illuminated or flashes, the
system has malfunctioned. Have your
vehicle checked as soon as possible.
Pulling Away on a Hill When Towing a
Trailer
Press and hold the brake pedal.
Pull the switch upward and hold
it.
Shift into gear.
Press the accelerator pedal until engine
has developed sufficient torque to prevent
your vehicle from rolling down the hill. Release the switch and pull
away in a normal manner.
Automatically Releasing the
Electric Parking Brake
Close the driver door.
Shift into gear.
Press the accelerator pedal and pull away
in a normal manner. The red warning lamp turns off.
If it remains illuminated or flashes, the
electric parking brake has not released.
Manually release the parking brake.
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Vehicles with Automatic Transmission
You cannot turn the system on or off.
When you switch the ignition on, the
system automatically turns on.
AUTO HOLD
WARNING: The system does not
replace the parking brake. When you
leave your vehicle, always apply the
parking brake. WARNING:
You must remain in
your vehicle when the system turns on.
At all times, you are responsible for
controlling your vehicle, supervising the
system and intervening, if required.
Failure to take care may result in the loss
of control of your vehicle, serious
personal injury or death. WARNING:
The system turns off if
there is a malfunction or if you
excessively rev the engine.
The system is designed to apply the brakes
to hold your vehicle at a standstill after you
stop your vehicle and release the brake
pedal. This could be beneficial in certain
situations, for example when waiting on a
hill or in traffic.
Switching Auto Hold On and Off Press the button on the center
console. The button illuminates
when you switch the system on.
Note: You can only switch the system on
after you close the driver door, and start the
engine.
Note: The system remembers the last
setting when you start your vehicle. Make sure you switch the system off before
towing with your vehicle or before using an
automatic car wash.
Using Auto Hold
1. Use the brakes to bring your vehicle to
a complete stop. The auto hold active
indicator illuminates in the information
display.
2. Release the brake pedal. The system holds your vehicle at a standstill. The
auto hold active indicator remains
illuminated in the information display.
Note: The system only activates if you
apply enough brake pressure. If your vehicle
is on a steep slope, you might need to press
the brake pedal harder before the system
activates.
Note: Under certain conditions, the system
could apply the electric parking brake. The
brake system warning lamp illuminates. The
electric parking brake releases when you
press the accelerator pedal. See Electric
Parking Brake (page 215).
Note: If auto-start-stop turns off the
engine, auto hold remains active.
Note: The system deactivates if you shift
into reverse (R) and press the brake pedal.
3. Pull away in the normal manner. The system releases the brakes and the
auto hold active indicator turns off.
Auto Hold Indicator
The auto hold indicator illuminates in the
information display when the system is on
and is either active or unavailable. Illuminates when the system is
active. Your vehicle remains
stationary after you release the
brake pedal.
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PRINCIPLE OF OPERATION
The traction control system helps avoid
drive wheel spin and loss of traction.
If your vehicle begins to slide, the system
applies the brakes to individual wheels
and, when needed, reduces engine power
at the same time. If the wheels spin when
accelerating on slippery or loose surfaces,
the system reduces engine power in order
to increase traction.
USING TRACTION CONTROL
WARNING: The stability and
traction control light illuminates steadily
if the system detects a failure. Make sure
you did not manually disable the traction
control system using the information
display controls or the switch. If the
stability control and traction control light
is still illuminating steadily, have the
system serviced by an authorized dealer
immediately. Operating your vehicle with
the traction control disabled could lead
to an increased risk of loss of vehicle
control, vehicle rollover, personal injury
and death.
The system automatically turns on each
time you switch the ignition on.
If your vehicle is stuck in mud or snow,
switching traction control off may be
beneficial as this allows the wheels to spin.
Note: When you switch traction control off,
stability control remains fully active.
Switching the System Off
When you switch the system off or on, a
message appears in the information
display showing system status.
You can switch the system off by using the
switch. Using a Switch
(If Equipped)
Use the traction control switch on the
center console near the shifter to switch
the system off or on. The traction control switch.
System Indicator Lights and
Messages The stability and traction control
light:
• Temporarily illuminates on engine
start-up.
• Flashes when a driving condition
activates either of the systems.
• Illuminates if a problem occurs in either
of the systems. The stability and traction control
off light temporarily illuminates
on engine start-up and stays on
when you switch the traction control
system off.
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PRINCIPLE OF OPERATION
WARNING: Vehicle modifications
involving braking system, aftermarket
roof racks, suspension, steering system,
tire construction and wheel and tire size
may change the handling characteristics
of your vehicle and may adversely affect
the performance of the electronic
stability control system. In addition,
installing any stereo loudspeakers may
interfere with and adversely affect the
electronic stability control system. Install
any aftermarket stereo loudspeaker as
far as possible from the front center
console, the tunnel, and the front seats
in order to minimize the risk of interfering
with the electronic stability control
sensors. Reducing the effectiveness of
the electronic stability control system
could lead to an increased risk of loss of
vehicle control, vehicle rollover, personal
injury and death. WARNING:
Remember that even
advanced technology cannot defy the
laws of physics. It’ s always possible to
lose control of a vehicle due to
inappropriate driver input for the
conditions. Aggressive driving on any
road condition can cause you to lose
control of your vehicle increasing the risk
of personal injury or property damage.
Activation of the electronic stability
control system is an indication that at
least some of the tires have exceeded
their ability to grip the road; this could
reduce the operator ’s ability to control
the vehicle potentially resulting in a loss
of vehicle control, vehicle rollover,
personal injury and death. If your
electronic stability control system
activates, SLOW DOWN.
The system automatically turns on each
time you switch the ignition on. If a driving condition activates either the
stability control or the traction control
system you may experience the following
conditions:
•
The stability and traction control light
flashes.
• 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 and
your foot is not on the brake, the brake
pedal may move as the systems
applies higher brake forces.
The stability control system has several
features built into it to help you maintain
control of your vehicle:
Electronic Stability Control
The system enhances your vehicle ’s ability
to prevent skids or lateral slides by
applying brakes to one or more of the
wheels individually and, if necessary,
reducing engine power.
Roll Stability Control
The system enhances your vehicle ’s ability
to prevent rollovers by detecting your
vehicle ’s roll motion and the rate at which
it changes by applying the brakes to one
or more wheels individually.
Curve Control
The system enhances your vehicle ’s ability
to follow the road when cornering severely
or avoiding objects in the roadway. Curve
Control operates by reducing engine power
and, if necessary, applying brakes to one
or more of the wheels individually.
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Traction Control
The system enhances your vehicle
’s ability
to maintain traction of the wheels by
detecting and controlling wheel spin. See
Using Traction Control (page 224). Vehicle without stability control
skidding off its intended route.
A
Vehicle with stability control
maintaining control on a slippery
surface.
B USING STABILITY CONTROL
Electronic Stability Control - Base
Model
The system automatically turns on each
time you switch the ignition on.
You cannot switch the stability control and
roll stability control systems off, but when
you shift into reverse (R), the systems
deactivate.
You can switch the traction control system
off or on. See
Using Traction Control
(page 224).
Electronic Stability Control - ST
Model The system turns on each time
you switch the ignition on. You
can switch off the traction
control portion of the system
independently.
See Using Traction
Control (page 224).
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