1998 FORD F150 service

the On Board Diagnostics System
(OBD II). This OBD II system
protects the environment by
ensuring that your vehicle
continues to meet government
emission standards. The OBD II
system also assists the service
technician in properly servicing
your vehicle.
TheCheck Engineindicator light
illuminates when the ignition is
first turned to the ON position to
check the bulb. If it comes on after
the engine is started, one of the
engine's emission control systems
may be malfunctioning. The light
may illuminate without a
driveability concern being noted.
The vehicle will usually be drivable
and will not require towing.
What you should do if the
check engine light illuminates
Light turns on solid:
This means that the OBD II system
has detected a malfunction.
Temporary malfunctions may cause
yourCheck Enginelight to
illuminate. Examples are:
1. The vehicle has run out of fuel.
(The engine may misfire or run
poorly.)
2. Poor fuel quality or water in the
fuel.
3. The fuel cap may not have been
properly installed and securely
tightened.
These temporary malfunctions can
be corrected by filling the fuel tank
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with good quality fuel and/or
properly installing and securely
tightening the gas cap. After three
driving cycles without these or any
other temporary malfunctions
present, theCheck Enginelight
should turn off. (A driving cycle
consists of a cold engine startup
followed by mixed city/highway
driving.) No additional vehicle
service is required.
If theCheck Enginelight remains
on, have your vehicle serviced at
the first available opportunity.
Light is blinking:
Engine misfire is occurring which
could damage your catalytic
converter. You should drive in a
moderate fashion (avoid heavy
acceleration and deceleration) and
have your vehicle serviced at the
first available opportunity.
Under engine misfire
conditions, excessive
exhaust temperatures could
damage the catalytic converter,
the fuel system, interior floor
coverings or other vehicle
components, possibly causing a
fire.
Air bag readiness
Momentarily illuminates when the
ignition is turned ON. If the light
fails to illuminate, continues to
flash or remains on, have the
system serviced immediately.
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Safety belt
Momentarily illuminates when the
ignition is turned ON to remind
you to fasten your safety belts. For
more information, refer to the
Seating and safety restraints
chapter.
Brake system warning
Momentarily illuminates when the
ignition is turned on and the
engine is off. Also illuminates when
the parking brake is engaged.
Illumination after releasing the
parking brake indicates low brake
fluid level.
Anti-lock brake system (ABS)
Momentarily illuminates when the
ignition is turned on and the
engine is off. If the light remains
on, continues to flash or fails to
illuminate, have the system
serviced immediately.
Turn signal
Illuminates when the left or right
turn signal or the hazard lights are
turned on. If one or both of the
indicators stay on continuously or
flash faster, check for a burned-out
turn signal bulb. Refer toExterior
bulbsin theMaintenance and
carechapter.
!
BRAKE
ABS
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High beams
Illuminates when the high beam
headlamps are turned on.
Anti-theft system (if equipped)
Refer toPerimeter alarm system
in 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
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The right front passenger
air bag is not designed to
restrain occupants in the center
front seating position.
All occupants of the
vehicle including the driver
should always wear their safety
belts even when air bag SRS is
provided.
Do not place objects or
mount equipment on or
near the air bag cover on the
steering wheel or in front seat
areas that may come into contact
with a deploying air bag. Failure
to follow this instruction may
increase the risk of personal
injury in the event of a collision.
Do not attempt to service,
repair, or modify the Air
Bag Supplemental Restraint
System or its fuses. See your
Ford or Lincoln-Mercury dealer.
Children and air bags
For additional important safety
information, read all information
on safety restraints in this guide.
Children should always wear their
safety belts. Failure to follow these
instructions may increase the risk
of injury in a collision.
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Instrumentationchapter. Routine
maintenance of the air bag is not
required.
A difficulty with the system is
indicated by one or more of the
following:
²The readiness light will either
flash or stay lit.
²The readiness light will not
illuminate immediately after
ignition is turned on.
²A series of five beeps will be
heard. The tone pattern will
repeat periodically until the
problem and light are repaired.
If any of these things happen, even
intermittently, have the SRS
serviced at your dealership or by a
qualified technician immediately.
Unless serviced, the system may
not function properly in the event
of a collision.
Disposal of air bags and air bag
equipped vehicles
For disposal of air bags or air bag
equipped vehicles, see your local
dealership or qualified technician.
Air bags MUST BE disposed of by
qualified personnel.
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Turning the passenger
air bag off
1. Insert the ignition key, turn the
switch to OFF and remove the key.
2. When the ignition is turned to
the ON position the OFF light
illuminates briefly, momentarily
shuts off and then turns back on.
This indicates that the passenger
air bag is deactivated.
If the light fails to
illuminate when the
passenger air bag switch is in the
OFF position and the ignition
switch is in ON, have the
passenger air bag switch serviced
at your Ford or Lincoln-Mercury
dealer immediately.
In order to avoid
inadvertent deployment of
the passenger air bag, always
remove the ignition key from the
passenger air bag deactivate
switch.
Turning the passenger air bag
back on
The passenger air bag remains
OFF until you turn it back ON.
PASSENGER AIRBAG
ON
OFF OFF
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1. Insert the ignition key and turn
the switch to ON.
2. The OFF light will briefly
illuminate when the ignition is
turned to On. This indicates that
the passenger air bag is
operational.
If the light is illuminated
when the passenger air
bag switch is in the ON position
and the ignition switch is in ON,
have the passenger air bag
switch serviced at your Ford or
Lincoln-Mercury dealer
immediately.
Keep the passenger air bag
turned on unless there is a
child seat installed in the front
seat. When the passenger air bag
switch is turned off, the
passenger air bag will not inflate
in a collision.
PASSENGER AIRBAG
ON
OFF OFF
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