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Tire Pressure Monitoring System


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5 replies to this topic

#1 shagphil

shagphil
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Posted March 8, 2005 at 05:38 pm

:lol: Does anyone have any idea as to how to disconnect/turn off the TPMS? I have put oversize tires on my new Pacifica for a better handling/ride. However, the TPMS now shows "Service Tire System Soon" and I can not access any other information on the system. The dealer say the ?>":<>? thing can't be disconnected/turned off....Thanks.

#2 fnkychkn

fnkychkn

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Posted March 8, 2005 at 07:57 pm

the dealer is right, this system cannot be disconnected or turned off.
depending on build date this system is controlled by CMTC (compass mini trip computer) or SKREEM (sentry key remote entry electronic module). if yours is SKREEM controlled you may be able to disable by replacing module with one that is not configured for TPM. if yours is CMTC controlled, replacing overhead console could prove costly.

#3 DSMLVR

DSMLVR

    Retired Chrysler Employee

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Posted March 9, 2005 at 09:50 am

If you have the 2004 Pacifica, here is what the 2004 Pacifica Service Manual says:

TIRE PRESSURE MONITORING
DESCRIPTION
The Tire Pressure Monitoring (TPM) system moni-tors
air pressure in the four road tires (excludes
spare). Pressure in the spare tire is not monitored.
There is a sensor (transmitter) in each of the vehi-cles
four road wheels. The system alerts the driver
when tire pressure falls outside predetermined
thresholds (pressure too low or too high). A message
is then displayed in the instrument cluster.
Depending on Build Date, the vehicles TPM could
be controlled one of two ways. Early Build vehicles
have a system that is controlled through the Com-pass
Mini Trip Computer (CMTC). Later (Normal)
Build vehicles have a system that is controlled by the
Sentry Remote Entry Module (SKREEM). When
Diagnosing the TPM, to determine if the vehicle has
an Early or Normal Build system, use the DRBIIIt
scan tool accessing the SKREEM to determine if it
has TPM capabilities.
For further information, refer to the Owners Man-ual
or the appropriate diagnostic information.
OPERATION
EARLY BUILD VEHICLES
The Tire Pressure Monitoring (TPM) system uses
radio and sensor technology to monitor tire air pres-
sure levels. Sensors, mounted to each road wheel as
part of the valve stem, transmit tire pressure read-ings
to a receiver located in the overhead console.
These transmissions occur once every minute at
speeds over 20 mph (32 km/h). The Tire Pressure
Monitoring system remains active even if no tire
pressure related message is displayed in the instru-ment
cluster.
If any road tire pressure has exceeded the low or
high pressure (ON) threshold (Refer to Table TPM
THRESHOLD PRESSURES ), the TPM system will
display a message in the instrument cluster and
sound a chime. This message will be displayed for
the rest of the ignition cycle, or until either the Low
or High Tire pressure condition has been corrected. If
the C/T, MENU, STEP or RESET button is pressed,
the message is replaced by the new message
requested; however, if the Low/High Tire condition
has not been corrected, the Low/High Tire pressure
message will again be displayed.
For further information, refer to the Owners Man-ual
or the Appropriate Diagnostic Information.

TPM THRESHOLD PRESSURES
High Pressure ON Threshold 45 PSI (310 kPa)
High Pressure OFF Threshold 40 PSI (276 kPa)
Placard Pressure (Cold) 33 PSI (228 kPa)
Low Pressure OFF Threshold 30 PSI (207 kPa)
Low Pressure ON Threshold 25 PSI (172 kPa)
NORMAL BUILD VEHICLES
The Tire Pressure Monitoring (TPM) system uses
radio and sensor technology to monitor tire air pres-sure
levels. Sensors, mounted to each road wheel as
part of the valve stem, transmit an RF frequency
indicating their individual pressure to a receiver
located in the Sentry Key Remote Entry Module
(SKREEM). These transmissions occur approximately
once every minute at speeds over 13 mph (20 km/h).
The Tire Pressure Monitoring system remains active
even if no tire pressure related message is displayed.
SENSOR - TPM
DESCRIPTION
On vehicles equipped with Tire Pressure Monitor-ing,
one tire pressure sensor is mounted to each
wheel (Fig. 14). Each sensor has an internal battery
that lasts up to 100,000 miles. The battery is not ser-viceable.
At the time of battery failure, the sensor
must be replaced. The serviceable components of the
tire pressure sensor are:
Sensor-To-Wheel Grommet
Valve Stem Cap
Valve Stem Core
Valve Stem Nut
Valve stem caps and cores are specifically designed
for the tire pressure monitoring sensors. Although
similar to standard valve stem caps and cores, they
are different.
CAUTION: Do not use a standard valve stem cap or
core in a tire pressure sensor. Always use the orig-inal
equipment style sensor cap and core.
CAUTION: Do not reuse the Sensor-To Wheel Grom-met.
Always use a new grommet when installing a
pressure sensor and properly torque the sensor
nut.
CAUTION: Do not try to install a tire pressure sen-sor
in a steel wheel or aftermarket wheel. Use only
in original style factory wheels.
OPERATION
The tire pressure sensors are battery operated.
Each sensor transmits tire pressure data approxi-mately
once every minute at speeds above 13 mph
(20 km/h). Each sensors (transmitter) broadcast is
uniquely coded so that the CMTC or SKREEM
(depending on Build Date) can monitor the states of
each individual sensor on the vehicle. Unlike the
Early Build TPM system, a magnet is not required to
retrain the SKREEM controlled system. The
SKREEM automatically learns while driving after a
sensor has been replaced. (Refer to 22 - TIRES/
WHEELS/TIRE PRESSURE MONITORING/SEN-SOR
- STANDARD PROCEDURE)
For additional information, refer to Appropriate
Diagnostic Information.
CAUTION
CAUTION: The use of tire sealants is strictly prohib-ited
for vehicles equipped with the Tire Pressure
Monitoring system. Tire sealants can clog tire pres-sure
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 a steel wheel or aftermarket wheel. Use
tire pressure sensors in original style factory
wheels only.
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.
If a fault in the system is detected, always check
air pressure in the tires first with a known accurate
air gauge and correct the inflation pressure. If any
tire is low, inspect all the tires.
NOTE: Early Build vehicles have a system that is
controlled through the Compass Mini Trip Computer
(CMTC). Normal Build vehicles have a system that
is controlled by the Sentry Remote Entry Module
(SKREEM). When Diagnosing the TPM, to determine
if the vehicle has an Early or Normal Build system,
use the DRBIIIT scan tool accessing the SKREEM to
determine if it has TPM capabilities.
On Early Build vehicles, if gauge-read pressure in
the tires does not reflect the reading in the instru-ment
cluster, retrain the sensors, then reevaluate
(Refer to 22 - TIRES/WHEELS/TIRE PRESSURE
MONITORING/SENSOR - STANDARD PROCE-DURE).
Refer to the appropriate diagnostic informa-tion
for complete diagnosis of the Tire Pressure
Monitoring System.
On Normal Build vehicles, if the gauge-read pres-sure
in the tires does not indicate a tire pressure
issue, refer to the appropriate diagnostic information.
STANDARD PROCEDURE - TIRE PRESSURE
SENSOR RETRAIN
NOTE: Early Build vehicles have a system that is
controlled through the Compass Mini Trip Computer
(CMTC). Normal Build vehicles have a system that
is controlled by the Sentry Remote Entry Module
(SKREEM). When Diagnosing the TPM, to determine
if the vehicle has an Early or Normal Build system,
use the DRBIIIT scan tool accessing the SKREEM to
determine if it has TPM capabilities.
EARLY BUILD VEHICLES
WARNING: DEATH OR SERIOUS INJURY CAN
OCCUR IF MAGNETICALLY SENSITIVE DEVICES
ARE EXPOSED TO RELEARN MAGNET. MAGNETS
CAN AFFECT PACEMAKERS.
CAUTION: Never attempt to train more than one
vehicle at a time. System is capable of reading tire
pressure sensor transmissions from other nearby
vehicles.
Each time a wheel rotation or tire pressure sensor
replacement occurs tire pressure sensors must be
retrained. This is necessary to inform Compass Mini
Trip Computer (CMTC)) that a sensor change was
made and where. Retraining is accomplished through
instrument cluster and CMTC used in conjunction
with a Re-learn Magnet, Special Tool 8821.
NOTE: Use following procedure to retrain all four
(4) road wheel tire pressure sensors. No attempt
should be made to retrain individual sensors.
(1) Retrieve Re-learn Magnet, Special Tool 8821.
(2) Place key in ON position.
(3) Press MENU Button on instrument cluster
until 9RETRAIN TIRE SENSORS?9 is displayed.
(4) Press STEP button. Display will now read
9TRAIN LEFT FRONT SENSOR9
NOTE: There is a 60 second timer for training first
sensor and a 60 second timer between training
remaining sensors. If any of these timers expire,
CMTC will abort training procedure.
NOTE: If at any time instrument cluster display
reads (TRAINING ABORTED(, move vehicle ahead at
least one foot and repeat entire retraining proce-dure.
(5) Starting at left front tire, place Re-learn Mag-net
over valve stem (Fig. 12). Within approximately 5
seconds, vehicle horn will chirp indicating training
complete at that particular sensor. Remove magnet.
NOTE: The order for retraining all four sensors is:
Left Front
Right Front
Right Rear
Left Rear
(6) Repeat step (5) on remaining sensors as indi-cated
by instrument cluster until all four TPM sen-sors
are trained.
(7) Once instrument cluster displays 9TRAINING
COMPLETE9, pressing either US/M, MENU, STEP
or RESET button will exit training routine.
NORMAL BUILD VEHICLES
CAUTION: If a sensor is replaced, the vehicle must
be parked for a minimum of 15 minutes for the sys-tem
to be ready to learn the new sensor ID code.
(1) Park the car for a minimum of 15 minutes.
(2) Drive the vehicle for a minimum of five min-utes
while maintaining a continuous speed above 13
mph (20 km/h). During this time the system will
learn the new sensor ID code and will clear any
DTCs automatically.
NOTE: If a sensor cannot be trained, refer to appro-priate
diagnostic information.
(1) Remove tire and wheel assembly REMOVAL
from vehicle.
(Refer to 22 - TIRES/WHEELS - REMOVAL)
Fig. 12 Magnet Placement Over Valve Stem


1 - RE-LEARN MAGNET
2 - VALVE STEM

REMOVAL
(1) Remove tire and wheel assembly
from vehicle.
(Refer to 22 - TIRES/WHEELS - REMOVAL)
CAUTION: The cap used on this valve stem con-tains
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 regu-lar
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 rein-stalled
and not substituted with a valve stem core
made of a different material. This is required to pre-vent
corrosion in the valve stem caused by the dif-ferent
metals.
(2) 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/dimount-ing
tool at the valve stem 10 (Fig. 13), then pro-ceed
to dismount the tire from the wheel. Use this
process on both the upper and lower tire beads.

Fig. 13 Start Mount/Dismount Tool Within 10
Degrees Of Valve Stem







(3) Using a thin wall socket, remove special nut
retaining sensor to wheel (Fig. 14).
(4) Remove sensor from wheel (Fig. 14).

Fig. 14 Sensor Mounting To Wheel





INSTALLATION
NOTE: Before reinstalling a tire pressure sensor,
replace sealing grommet at base of valve stem.
(1) Wipe area clean where sensor sealing grommet
contacts wheel. Make sure surface of wheel is not
damaged.
(2) Install sensor in wheel as shown (Fig. 14). Do
not attempt to mount sensor otherwise, damage may
occur.
(3) Using a thin wall socket, install special sensor
nut (Fig. 14). Tighten nut to 4 Nm (35 in. lbs.)
torque.
CAUTION: Over-torquing the sensor nut by as little
as 12 Nm (106 in. lbs.) may result in sensor sepa-ration
from the valve stem. Under this condition,
the sensor may still function, however, the condi-tion
should be corrected immediately.
(4) Mount tire on wheel following tire changer
manufacturers instructions, paying special attention
to the following to avoid damaging tire pressure sen-sor:
(a) Rotating Wheel Tire Changers - Once the
wheel is mounted to the changer, position the sen-sor
valve stem approximately 210 from the head
of the changer in a clockwise direction before rotat-ing
the wheel (also in a clockwise direction) to
mount the tire (Fig. 15). Use this procedure on
both the upper and lower tire beads.
(B) Rotating Tool Tire Changers - Position the
wheel on the changer so that the sensor valve stem
is approximately 210 from the head of the changer
in a clockwise direction from the mounting end of
the tool (Fig. 16) Make sure the sensor is clear of
the lower bead breaker area to avoid damaging the
sensor when the breaker rises (Fig. 16). Rotate the
tool in a counterclockwise direction to mount the
tire. Use this procedure on both the upper and
lower tire beads.


(5) Install wheel and tire assembly on vehicle.
(Refer to 22 - TIRES/WHEELS - INSTALLATION)
(6) Retrain tire pressure sensors. (Refer to 22 -TIRES/
WHEELS/TIRE PRESSURE MONITORING/
SENSOR - STANDARD PROCEDURE)
TIRES
DESCRIPTION
DESCRIPTION - TIRE
Tires are designed and engineered for each specific
vehicle. They provide the best overall performance
for normal operation. The ride and handling charac-teristics
match the vehicles requirements. With
proper care they will give excellent reliability, trac-tion,
skid resistance, and tread life.
Driving habits have more effect on tire life than
any other factor. Careful drivers will obtain, in most
cases, much greater mileage than severe use or care-less
drivers. A few of the driving habits which will
shorten the life of any tire are:
Rapid acceleration


Severe application of brakes
High-speed driving
Taking turns at excessive speeds
Striking curbs and other obstacles
Operating vehicle with over or under inflated
tire pressures
Radial ply tires are more prone to irregular tread
wear. It is important to follow the tire rotation inter-val
shown in the section on Tire Rotation. This will
help to achieve a greater tread-life potential.

END.

#4 shagphil

shagphil
  • Inactive
  • 2 posts

Posted March 9, 2005 at 08:00 pm

the dealer is right, this system cannot be disconnected or turned off.
depending on build date this system is controlled by CMTC (compass mini trip computer) or SKREEM (sentry key remote entry electronic module). if yours is SKREEM controlled you may be able to  disable by replacing module with one that is not configured for TPM. if yours is CMTC controlled, replacing overhead console could prove costly.

<{POST_SNAPBACK}>



#5 fnkychkn

fnkychkn

    swollen member

  • Active Member
  • 990 posts

Posted March 9, 2005 at 08:23 pm

If .....
END.

<{POST_SNAPBACK}>


boy i thought i was long winded :D

#6 DSMLVR

DSMLVR

    Retired Chrysler Employee

  • Active Member
  • 1,067 posts

Posted March 9, 2005 at 09:05 pm

boy i thought i was long winded


Thank You Mav_Mech, I resemble that. :rolleyes:


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