Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 2107

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

LX

NOTE: TPM thresholds have been established for the original tire size equipped on the vehicle. Use original
size tires only to maintain system accuracy.

DIAGNOSIS AND TESTING

TIRE PRESSURE SENSOR

NOTE: Tire pressure may increase from 2 to 6 psi (14 to 41 kPa) during normal driving conditions. Do NOT
reduce this normal pressure build up.

When diagnosing a tire pressure issue, always check air pressure in the tires first with a known accurate air gauge.
Adjust air pressure as necessary to that listed on the Tire Inflation Pressure Label (Placard) provided with the vehi-
cle (usually applied to the driver’s side B-pillar). After adjusting air pressure in a tire on the vehicle, allow approxi-
mately two minutes for the message or indicator lamp to go out.

Check the tire pressure indicator lamp in the instrument cluster. If the lamp is illuminating continuously, proceed as
listed below. If the indicator lamp is flashing on/off for 60 seconds, once every 10 minutes, there is a system fault
detected. Refer to the appropriate diagnostic information.

If air pressure in any tire is low, inspect all the tires for leaks. A water “dunk tank” or other water test may be used
to check for a leak around the sensor as long as any water at the valve core is removed once the procedure is
completed. The water can be easily expelled from the core area by pushing in on the core for several seconds,
allowing escaping air to drive out any moisture. Reinflate the tire as necessary. Always make sure the original valve
stem cap is securely installed to keep moisture out of the sensor.

If the gauge-read pressure in the tires does not indicate a tire pressure issue, refer to the appropriate diagnostic
information.

REMOVAL

1. Raise and support vehicle. (Refer to LUBRICATION & MAINTENANCE/HOISTING - STANDARD PROCEDURE)

2. Remove wheel mounting nuts (3), then tire and

wheel assembly (1). (Refer to 22 - TIRES/WHEELS
- REMOVAL)

CAUTION: The cap used on this valve stem contains an O-ring seal to prevent contamination and moisture
from entering the valve stem. Retain this valve stem cap for reuse. Do not substitute a regular valve stem
cap in its place.

CAUTION: The valve stem used on this vehicle is made of aluminum and the core is nickel plated brass.
The original valve stem core must be reinstalled and not substituted with a valve stem core made of a dif-
ferent material. This is required to prevent corrosion in the valve stem caused by the different metals.

LX

TIRES/WHEELS

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3. Dismount tire from wheel following tire changer

manufacturers instructions while paying special
attention to the following to avoid damaging the
pressure sensor:

a. When breaking the tire bead loose from the

wheel rim, avoid using the Bead Breaker in the
area of the sensor. That includes both front
and rear beads of the tire.

b. When preparing to dismount the tire from the

wheel, carefully insert the mounting/dismount-
ing tool at the valve stem ± 10°, then proceed
to dismount the tire from the wheel. Use this
process on both the upper and lower tire
beads.

4. Remove sensor nut (3) retaining sensor to wheel.

While removing nut, hold pressure against rear of
metal valve stem to keep valve stem from pushing
rearward, damaging antenna strap.

5. Remove sensor (1) from wheel (2).

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TIRES/WHEELS

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INSTALLATION

NOTE: Before reinstalling an existing tire pressure
sensor, replace seal (2) and metal washer (1) at
base of sensor valve stem (6) to ensure proper
sealing.

1. Wipe area clean around sensor/valve stem mount-

ing hole in wheel (5). Make sure surface of wheel
is not damaged.

CAUTION: To avoid damaging sensor antenna
strap (1), hold pressure against rear of metal valve
stem (2) while sensor is inserted through wheel
mounting hole and nut is installed.

LX

TIRES/WHEELS

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