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REPAIR & SUPPLIES - Auto-Mecanique

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Relearn – Many TPMS systems require retraining<br />

each time the tires/wheel are rotated or a sensor<br />

is replaced. Retraining is necessary for the system<br />

to learn the sensor(s) new postion(s). A relearn<br />

procedure may need to be followed in order to retrain<br />

the system. Relearn procedures differ by vehicle<br />

makes and are sometimes found in the vehicles<br />

Owner’s Manual. In those instances where the relearn<br />

procedure is not found in the Owner’s Manual a TPMS<br />

service guide may need to be referenced to find the<br />

relearn procedure.<br />

RF – Radio Frequency (Transmitted Frequency)<br />

Service Kit – Kit of components needed to properly<br />

service TPMS sensors. This kit can include replacement<br />

valves, cores, caps, grommets, locking nuts,<br />

and washers. The OEM recommends replacing the<br />

EPDM grommet, valve cap, valve core and locking nut<br />

every time a TPMS sensor is removed from the wheel<br />

or the wheel is serviced.<br />

Ship Mode – Also referred to as Off Mode is the<br />

TPMS sensor state where no transmission occurs and<br />

pressure sampling occurs once every 30 seconds.<br />

Mainly used for shipment and storage, sensors will<br />

remain in this condition until activated into another<br />

mode. Sensors being shipped from overseas are often<br />

shipped in Off Mode because the FCC will not allow<br />

any electronic devices to transmit any type of signal<br />

that may interfere with radio air waves. It is important<br />

to note that not all sensors are shipped in this mode.<br />

Sleep Mode – TPMS sensor state that occurs in<br />

between the time the sensor transmits and<br />

measures data.<br />

Snap-In Style Sensor – Sensor mounted to the<br />

wheel through the rim hole using a special rubber<br />

snap-in valve that is attached to the sensor module<br />

using a special T-10 TORX head screw. To identify a<br />

Snap-in TPMS sensor, look for a long valve cap or an<br />

extended brass shoulder.<br />

Test Mode – Sometimes referred to as Factory Test<br />

Mode, is the state in which the sensor transmits at<br />

the most frequent transmission rate possible. This<br />

mode is used by vehicle assembly plant tests.<br />

TPM – Tire Pressure Monitoring.<br />

TPMS Sensor – Also referred to as sensors, are<br />

wheel based electronic sensors used to transmit<br />

information/data in TPMS systems.<br />

TPMS – Tire Pressure Monitoring System. A<br />

warning system that notifies the driver when a<br />

tire is significantly under-inflated.<br />

TPMS Grommet – Many stem mounted sensors<br />

use a special rubber grommet for sealing. The OEM<br />

recommends replacing the grommet whenever the<br />

sensor is removed from the wheel. The rubber<br />

grommet provides the air seal in the valve stem<br />

opening, and a new one should be used to ensure<br />

a fresh seal after each service.<br />

TPMS Nut – Many TPMS sensors are attached to the<br />

wheel using a specially designed sealing nut. The<br />

OEM recommends replacing these nuts whenever it<br />

is removed. These nuts are either 11mm or 12mm.<br />

Each manufacture has its own recommended torque<br />

specification for the TPMS nuts.<br />

TPMS Valve Cap – TPMS sensors with an aluminum<br />

valve stem require a specially designed sealing cap.<br />

Sensors with an aluminum stem cannot use a<br />

standard (non-TPMS) valve cap. These special valve<br />

caps are designed for use with TPMS sensors and<br />

protect against the corrosion that forms when<br />

dissimilar metals come in contact.<br />

TPMS Valve Core – Many TPMS sensors have an<br />

aluminum valve stem with a specially designed valve<br />

core. The OEM recommends replacing this valve core<br />

whenever it is removed. Sensors with an aluminum<br />

valve stem cannot use a standard brass valve core;<br />

instead, they require a special nickel-plated valve<br />

core to protect against the corrosion that forms when<br />

dissimilar metals come in contact. The Tire and Rim<br />

Association (TRA) recommends a torque specification<br />

of 2 – 5 inch pounds for TR C1 valve cores. Sensors<br />

with a rubber valve stem may use a standard brass<br />

valve core for replacement.<br />

TRA – Tire and Rim Association. The standardizing<br />

body for the tire, rim, valve and allied parts industry<br />

for the United States.<br />

TREAD Act – Transportation Recall Enforcement<br />

Accountability Documentation Act. The law that<br />

mandates, beginning September 1, 2007, all new<br />

vehicles sold in the U.S. under a GVW of 10,000 lbs.,<br />

excluding motorcycles and light duty trucks with dual<br />

wheels on an axle, are required to be equipped with<br />

a tire pressure monitoring system (TPMS) to warn<br />

drivers when one or more of a vehicles tires are<br />

under-inflated by 25% or more.<br />

TSS – Tire Safety System<br />

UHF – Ultra High Frequency 315MHz and 433.92<br />

(sometimes referred to as 434) MHz.<br />

Keeping You On the Road 117

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