Wrangler 2WD V6-3.8L (2008)
Tire Pressure Sensor: Description and Operation
Description
DESCRIPTION
NOTE: On vehicles equipped with a Tire Pressure Monitoring System (TPMS), when the spare tire pressure sensor is replaced with a new
pressure sensor, a diagnostic scan tool MUST be used to run a routine that will program the new pressure sensor ID into the Wireless Control
Module (WCM), commonly referred to as the Sentry Key Remote Entry Module (SKREEM). Please copy the ID number off of the new
pressure sensor before installing it into the spare tire. Then follow the programming steps outlined in the diagnostic scan tool for: "Learn Spare
Tire Sensor ID" under Miscellaneous Functions for the "WCM/Wireless Control Module" menu item as appropriate.If a TPM-RKE Analyzer
special tool is available, put the new spare tire pressure sensor into "Park" mode to conserve the battery life of the sensor. If a TPM-RKE
Analyzer special tool is not available, rotate the spare tire with one of the road tires.
NOTE: If replacing the WCM, the spare tire must be dismounted from its wheel to access and note the spare tire pressure sensor ID.
Alternatively, a TPM-RKE Analyzer Tool can be used to obtain the TPM sensor ID also. Then follow the programming steps outlined in the
diagnostic scan tool for "Learn Spare Tire Sensor ID" under Miscellaneous Functions for the WCM wireless control module menu item as
appropriate.
On vehicles equipped with Tire Pressure Monitoring System, one tire pressure sensor (6) is mounted to each wheel in place of the traditional tire valve
stem. Each sensor has an internal battery that lasts up to 10 years. The battery is not serviceable. At the time of battery failure, the sensor must be
replaced.
The TPM system operates on a 315 MHz radio frequency. The 315 MHz sensors can be easily identified by a black sensor body, with (an oval insignia)
(1) and a grey valve cap (2).
The Export TPM system operates on a 433 MHz radio frequency. The 433 MHz sensors can be easily identified by a gray sensor body (with an oval
insignia) and a black valve cap (2).
CAUTION: Although 315 MHz and 433 MHz sensors are identical in size and shape, they are not interchangeable. Always make sure the
correct color sensor is being used. A RKE-TPM Analyzer can be used to determine the sensor's frequency without having to dismount the tire.
NOTE: Sensors may be identified by valve stem cap color. From the factory, 315 MHz sensors have a gray valve stem cap while 433 MHz
sensors have a black valve stem cap. Otherwise, once mounted inside a tire and wheel assembly you are not able to visually tell the difference
between a 315 MHz and 433 MHz sensor. The tire must be dismounted allowing visual inspection of the sensor body.
NOTE: If aftermarket wheels are installed and do not contain tire pressure sensors, the system will not function properly and the driver will be
continuously notified of a system malfunction.
The TPM sensors are designed for original style factory wheels. It is not recommended to install a tire pressure sensor in an aftermarket wheel.
(This could cause sealing and system performance issues).
