electrical system FORD EXPEDITION 1998 1.G Owners Manual

SecuriLockYanti-theft system
This light indicates the anti-theft
alarm system is armed. Refer to
Anti-theft systemin theControls
and featureschapter. Momentarily
illuminates when the ignition is
turned to ON/START. If the light
fails to illuminate, continues to
flash or remains on, have the
system serviced. Refer to
SecuriLockyanti-theft systemin
theControls and features
chapter.
Charging system
Momentarily illuminates when the
ignition is turned ON and the
engine is off. The light also
illuminates when the battery is not
charging properly, requiring
electrical system service.
Oil pressure/Engine coolant
This light will come on when the
key is in the ON position and the:
²engine coolant temperature is
very high
²engine oil pressure is low
The light serves as a notice that a
system needs your attention and to
check the engine coolant
temperature gauge and the engine
oil pressure gauge.
Refer toEngine coolant
temperature gaugeandEngine
THEFT
Instrumentation
10

Battery voltage gauge
This gauge shows the battery
voltage when the ignition is in the
ON position. If the pointer moves
and stays outside the normal
operating range (as indicated),
have the vehicle's electrical system
checked as soon as possible.
Engine oil pressure gauge
This shows the engine oil pressure
in the system. Sufficient pressure
exists as long as the needle
remains in the normal range (the
area between the ªHº and ªLº).
If the gauge indicates low
pressure, switch off the engine
immediately. Check the oil level.
Add oil if needed (refer to
Checking and adding engine oil
in theMaintenance and care
chapter). If the oil level is correct,
have your vehicle checked at your
dealership or by a qualified
technician.
TRIP COMPUTER
The trip computer tells you about
the condition of your vehicle
through a constant monitor of
vehicle systems. You may select
display features on the trip
computer for a display of status.
The appearance of your vehicle's
trip computer may differ
818
L
H
Instrumentation
16

If the air bag is inflated,
the air bag will not
function again and must be
replaced immediately.Ifthe
air bag is not replaced, the
unrepaired area will increase the
risk of injury in a collision.
The SRS consists of:
²driver and passenger air bag
modules (which include the
inflators and air bags),
²one or more impact and safing
sensors,
²a readiness light and tone
²and the electrical wiring which
connects the components.
The diagnostic module monitors its
own internal circuits and the
supplemental air bag electrical
system warning (including the
impact sensors), the system wiring,
the air bag system readiness light,
the air bag back up power and the
air bag ignitors.
Determining if the system is
operational
The SRS uses a readiness light in
the instrument cluster or a tone to
indicate the condition of the
system. Refer to theAir bag
readinesssection in the
Instrumentationchapter. Routine
maintenance of the air bag is not
required.
Seating and safety restraints
82

PREPARING TO START YOUR
VEHICLE
Engine starting is controlled by the
spark ignition system. This system
meets all Canadian
Interference-Causing Equipment
standard requirements regulating
the impulse electrical field strength
of radio noise.
When starting a fuel-injected
engine, avoid pressing the
accelerator before or during
starting. Only use the accelerator
when you have difficulty starting
the engine. For more information
on starting the vehicle, refer to
Starting the enginein this
chapter.
Extended idling at high
engine speeds can produce
very high temperatures in the
engine and exhaust system,
creating the risk of fire or other
damage.
Do not park, idle, or drive
your vehicle in dry grass
or other dry ground cover. The
emission system heats up the
engine compartment and exhaust
system, which can start a fire.
Starting
92

accelerator when the engine starts.
4. After idling for a few seconds,
apply the brake and release the
parking brake.
Using the engine block heater
(if equipped)
An engine block heater warms the
engine coolant, which improves
starting, warms up the engine
faster and allows the
heater-defroster system to respond
quickly. They are strongly
recommended if you live in a
region where temperatures reach
-23ÉC (-10ÉF) or below.
For best results, plug the heater in
at least three hours before starting
the vehicle. Using the heater for
longer than three hours will not
harm the engine, so the heater can
be plugged in the night before
starting the vehicle.
To prevent electrical
shock, do not use your
heater with ungrounded
electrical systems or
two-pronged (cheater) adapters.
Guarding against exhaust
fumes
Although odorless and colorless,
carbon monoxide is present in
exhaust fumes. Take precautions
to avoid its dangerous effects.
Starting
96

seconds and return the key to the
OFF position.
5. Make a further check for leaks
in the fuel system.
The fuel pump shut-off switch is
located in the passenger's foot
well, behind the kick panel.
FUSES AND RELAYS
Fuses
If electrical components in the
vehicle are not working, a fuse
may have blown. Blown fuses are
identified by a broken wire within
the fuse. Check the appropriate
fuses before replacing any
electrical components.
1515
Roadside emergencies
128

Fuse/Relay
LocationFuse Amp
RatingDescription
26 10A Daytime Running Lamps (DRL)
Module, Right Headlamp (Power
supplied through Multi-Function
Switch)
27 5A Main Light Switch, Fog Lamp
Relay
28 10A Left Headlamp
29 5A Autolamp Module, Instrument
Cluster, Transmission Control
Switch (TCS)
30 30A Radio Noise Capacitor, Ignition
Coil, PCM Power Diode, Coil On
Plugs
31 Ð Not Used
Power distribution box
The power distribution box is
located in the engine
compartment. The power
distribution box contains
high-current fuses that protect
your vehicle's main electrical
systems from overloads.
Always disconnect the
battery before servicing
high current fuses.
Always replace the cover
to the Power Distribution
Box before reconnecting the
battery or refilling fluid
reservoirs.
Roadside emergencies
133

JUMP STARTING YOUR
VEHICLE
The gases around the
battery can explode if
exposed to flames, sparks, or lit
cigarettes. An explosion could
result in injury or vehicle
damage.
Do not push start your
vehicle. You could damage
the catalytic converter.
Batteries contain sulfuric
acid which burns skin,
eyes, and clothing.
Preparing your vehicle
Also see the label on the battery.
1. Use only a 12±volt supply to
start your vehicle. If you connect
your battery to a 24±volt power
supply you can damage your
starter, ignition system and other
electrical components.
2. Do not disconnect the battery of
the disabled vehicle as this could
damage the vehicle's electrical
system.
3. Park the booster vehicle close to
the hood of the disabled vehicle
making sure theydo nottouch.
Set the parking brake on both
vehicles and stay clear of the
engine cooling fan and other
moving parts.
Roadside emergencies
145