User's Manual

Introduction
4
Schrader TPM Sensor
Vehicle manufacturers using Schrader TPM sensors:
 Ford
 Chrysler
 GM
 Infiniti
 Mitsubishi
 Nissan
 Saab
 Volvo
About Sensors
TPM sensors are micromechanical devices (a silicon-based vacuum
cell) powered by a lithium battery with a minimum life expectancy of
up to 10 years. Using their piezoresistive technology, they monitor
tire pressure via measuring the deformation of an internal
diaphragm.
They typically transmit measurement values and sensor ID data at
433 MHz (for European systems) or 315 MHz (for U.S. systems) to
the receiver control unit once per hour when the vehicle is parked
(and only if the pressure changes), to preserve battery life, and
every few seconds when the vehicle is traveling above a certain
speed (typically about 20 mph). If the tire pressure rises or falls
outside calibration limits, a warning light or message is displayed in
real time on the vehicle’s instrument panel, along with an audible
warning, to alert the driver.
Activating Sensors
To activate, or “wake up,” a TPM sensor to test its ability to sense
and transmit tire pressure and sensor ID information to the TPM
control module, you must use one of three different methods,
depending on the type/brand of sensor: