Ford F-550 (2017 year). Manual — part 97

Understanding Your Tire Pressure
Monitoring System

Single Rear Wheel

E224333

Dual Rear Wheel

E224332

The tire pressure monitoring system
measures pressure in your road tires and
sends the tire pressure readings to your
vehicle. The low tire pressure warning light
will turn on if the tire pressure is
significantly low. Once the light is
illuminated, one or more of your tires are
under-inflated and needs to be inflated to
the manufacturer’s recommended tire
pressure. Even if the light turns on and a
short time later turns off, your tire pressure
still needs to be checked.

When Your Temporary Spare Tire is
Installed

When one of your road tires needs to be
replaced with the temporary spare, the
system will continue to identify an issue to
remind you that the damaged road wheel
and tire assembly needs to be repaired and
put back on your vehicle.

To restore the full function of the tire
pressure monitoring system, have the
damaged road wheel and tire assembly
repaired and remounted on your vehicle.

When You Believe Your System is Not
Operating Properly

The main function of the tire pressure
monitoring system is to warn you when
your tires need air. It can also warn you in
the event the system is no longer capable
of functioning as intended. See the
following chart for information concerning
your tire pressure monitoring system:

Customer action required

Possible cause

Low tire pressure

warning light

Make sure tires are at the proper pres-
sure. See Inflating your tires in this
chapter. After inflating your tires to the
manufacturer’s recommended pressure
as shown on the Tire Label (located on
the edge of driver’s door or the B-Pillar),
the vehicle must be driven for at least
two minutes over 20 mph (32 km/h)
before the light turns off.

Tire under inflated

Solid warning light

Repair the damaged road wheel and tire
assembly and reinstall it on the vehicle
to restore system function. For a
description on how the system functions,
see When your temporary spare tire
is installed in this section.

Spare tire in use

If the tires are properly inflated and the
spare tire is not in use but the light
remains on, contact your authorized
dealer as soon as possible.

Tire pressure monitoring

system malfunction

On vehicles with different front and rear
tire pressures, the system must be
retrained following every tire rotation.
See Tire Care (page 373).

Tire rotation without

sensor training

Repair the damaged road wheel and tire
assembly and reinstall it on the vehicle
to restore system function. For a
description on how the system functions,
see When your temporary spare tire
is installed in this section.

Spare tire in use

Flashing warning

light

If the tires are properly inflated and the
spare tire is not in use but the light
remains on, contact your authorized
dealer as soon as possible.

Tire pressure monitoring

system malfunction

When Inflating Your Tires

When putting air into your tires (such as at
a gas station or in your garage), the tire
pressure monitoring system may not
respond immediately to the air added to
your tires.

It may take up to two minutes of driving
over 20 mph (32 km/h) for the light to turn
off after you have filled your tires to the
recommended inflation pressure.

How Temperature Affects Your Tire
Pressure

The tire pressure monitoring system
monitors tire pressure in each pneumatic
tire. While driving in a normal manner, a
typical passenger tire inflation pressure
may increase about 2 to 4 psi (14 to 28
kPa) from a cold start situation. If the
vehicle is stationary overnight with the
outside temperature significantly lower
than the daytime temperature, the tire
pressure may decrease about 3 psi (21
kPa) for a drop of 30°F (17°C) in ambient
temperature. This lower pressure value
may be detected by the tire pressure
monitoring system as being significantly
lower than the recommended inflation
pressure and activate the system warning
light for low tire pressure.

If the low tire pressure warning light is on,
visually check each tire to verify that no tire
is flat. If one or more tires are flat, repair as
necessary. Check the air pressure in the
road tires. If any tire is under-inflated,
carefully drive the vehicle to the nearest
location where air can be added to the
tires. Inflate all the tires to the
recommended inflation pressure.

Tire Pressure Monitoring System Reset
Procedure

WARNING

To determine the required
pressure(s) for your vehicle, see the
Safety Compliance Certification

Label (on the door hinge pillar, door-latch
post or the door edge that meets the
door-latch post, next to the driver seat) or
the Tire Label on the B-Pillar or the edge
of the driver door.

Note: You need to perform the tire pressure
monitoring system reset procedure after
each tire rotation.

To provide the vehicle's load carrying
capability, some vehicles require different
recommended tire pressures in the front
tires as compared to the rear tires. The tire
pressure monitoring system equipped on
these vehicles is designed to illuminate the
low tire pressure warning light at two
different pressures; one for the front tires
and one for the rear tires.

Since tires need to be rotated to provide
consistent performance and maximum tire
life, the tire pressure monitoring system
needs to know when the tires are rotated
to determine which set of tires are on the
front and which are on the rear. With this
information, the system can detect and
properly warn of low tire pressures.

System reset tips:

•

To reduce the chances of interference
from another vehicle, perform the
system reset procedure at least three
feet (one meter) away from another
Ford Motor Company vehicle
undergoing the system reset procedure
at the same time.

•

Do not wait more than two minutes
between resetting each tire sensor or
the system will time-out and the entire
procedure will have to be repeated on
all four wheels.

•

A double horn will sound indicating the
need to repeat the procedure.

Performing the System Reset Procedure
(Single Rear Wheel)

Read the entire procedure before
attempting.

1.

Drive the vehicle above 20 mph
(32 km/h) for at least two minutes,
then park in a safe location where you
can easily get to all four tires and have
access to an air pump.

2. Place the ignition in the off position and

keep the key in the ignition.

3. Cycle the ignition to the on position

with the engine off.

4. Turn the hazard flashers on then off

three times. You must accomplish this
within 10 seconds. If the reset mode
has been entered successfully, the horn
will sound once, the system indicator
will flash and a message is shown in
the information display. If this does not
occur, please try again starting at Step
2. If after repeated attempts to enter
the reset mode, the horn does not
sound, the system indicator does not
flash and no message is shown in the
information display, seek service from
your authorized dealer.

5. Train the tire pressure monitoring

system sensors in the tires using the
following system reset sequence
starting with the left front tire in the
following clockwise order: Left front
(driver's side front tire), Right front
(passenger's side front tire), Right rear
(passenger's side rear tire), Left rear
(driver's side rear tire).

6. Remove the valve cap from the valve

stem on the left front tire. Decrease the
air pressure until the horn sounds.

Note: The single horn chirp confirms that
the sensor identification code has been
learned by the module for this position. If a
double horn is heard, the reset procedure
was unsuccessful, and you must repeat it.

7.

Remove the valve cap from the valve
stem on the right front tire. Decrease
the air pressure until the horn sounds.

8. Remove the valve cap from the valve

stem on the right rear tire. Decrease the
air pressure until the horn sounds.

9. Remove the valve cap from the valve

stem on the left rear tire. Decrease the
air pressure until the horn sounds.
Training is complete after the horn
sounds for the last tire trained (driver's
side rear tire), the system indicator
stops flashing, and a message is shown
in the information display.

10.

Turn the ignition off. If two short horn
beeps are heard, the reset procedure
was unsuccessful and you must
repeat it. If after repeating the
procedure and two short beeps are
heard when the ignition is turned to
off, seek assistance from your
authorized dealer.