FORD 2009 F-150 v.2 - Manual (Page 238)

TPMS reset procedure (if applicable)
The TPMS reset tool is ONLY provided for vehicles with different
front and rear tire pressures. The TPMS reset procedure needs to
be performed after tire rotation only on these vehicles.
WARNING: To determine if your vehicle has different
recommended pressures for the front and rear tires, refer to the
Safety Compliance Certification Label or Tire Label which is located on
the B-Pillar or the edge of the driver’s door. See Vehicle Loading in
this chapter for more information.
Overview
To provide the vehicle’s load carrying capability, some trucks require
different recommended tire pressures in the front tires as compared to
the rear tires. The Tire Pressure Monitoring System (TPMS) equipped on
these vehicles is designed to illuminate the Low Tire Pressure Warning
indicator 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.
WARNING: Always perform the TPMS reset procedure after tire
rotation when recommended pressures are different for the front
and rear tires.
2009 F-150 (f12)
Owners Guide, 2nd Printing
USA (fus)
Tires, Wheels and Loading
238