The serviceable components of the tire pressure sen-
sor are :
•
Sensor-To-Wheel Seal (2) and Metal Washer (1)
•
Valve Stem Cap (4)
•
Valve Stem Core
•
Valve Stem Nut (with pressed-in washer) (3)
The valve stem caps and cores used are specifically designed for the tire pressure monitoring sensors. Although
similar to standard valve stem caps and cores, they are different. The valve stem cap has a special seal inside to
keep moisture and corrosion out. The valve stem core has a special nickel coating to protect from corrosion.
OPERATION
The battery operated tire pressure sensors lay dormant (Park Mode), then wake and start transmitting (Drive Mode)
when the vehicle first reaches speeds over 15 mph (24 km/h). Once the wheels stop rotating for a period of approx-
imately 20 minutes, the sensors shut down until again awaken. Although not transmitting as when in Drive Mode,
while in Park Mode, the sensors still transmit approximately once every 13 hours to let the receiver know air pres-
sure status at that time. Sensors will also transmit when a pressure change of one psi (seven kPa) or more is
detected during that period.
Using an RF signal, each sensor transmits tire pressure data approximately once every minute. Each sensor’s
(transmitter) broadcast is uniquely coded so that the Wireless Control Module (WCM), commonly referred to as the
Sentry Key Remote Entry Module (SKREEM), can monitor the state of each of the sensors in the four rotating road
wheels. The WCM automatically learns and stores the sensor’s ID while driving after a sensor has been replaced.
This can take up to 10 minutes while driving at speeds above 15 mph (24 km/h). There is no formal retraining
procedure necessary.
For additional information, refer to appropriate diagnostic information.
CAUTION
CAUTION: The use of tire sealants is strictly prohibited for vehicles equipped with the Tire Pressure Mon-
itoring system. Tire sealants can clog tire pressure sensors.
CAUTION: Tire pressure sensor valve stem caps and cores are specially designed for the sensors. Due to
risk of corrosion, do not use a standard valve stem cap or core in a tire pressure sensor in place of the
original equipment style sensor cap and core.
CAUTION: Do not attempt to install a tire pressure sensor in an aftermarket wheel. Use tire pressure sen-
sors in original style factory wheels only. If aftermarket wheels are installed, and therefore do not contain
tire pressure sensors, the system will not function properly and the driver will be continuously notified of a
system malfunction.
CAUTION: Any time a sensor is to be installed in a wheel, a new seal and washer must be installed on the
stem to ensure air tight sealing.
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TIRES/WHEELS
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