Ford F-650 2001 Owner's Manual page 15

Safety belt
Momentarily illuminates when the
ignition is turned to the ON position
to remind you to fasten your safety
belts. For more information, refer to
the Seating and safety restraints
chapter.
Service engine soon
The Service Engine Soon indicator
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 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.
Temporary malfunctions may cause your Service Engine Soon light 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.
These and other temporary malfunctions can be corrected by filling the
fuel tank with good quality fuel. After three driving cycles without these
or any other temporary malfunctions present, the Service Engine Soon
light 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 the Service Engine Soon light remains on, have your vehicle serviced
at the first available opportunity.
Under engine misfire conditions, excessive exhaust temperatures
could damage the fuel system, interior floor coverings or other
vehicle components, possibly causing a fire.
Instrumentation
SERVICE
ENGINE
SOON
15