Magazine for the professional tire industry
Issue link: https://mtd.epubxp.com/i/148910
TPMS Mountaineer TPMS is not afected by wheel and tire rotation Warning light may activate if pressures are not adjusted cold SUBJECT VEHICLE: 2008-10 Mercury Mountaineer RELEARN PROCEDURE? Yes. SPECIAL TOOLS NEEDED? Yes, a TPMS Activation Tool (P/N 204-363) or equivalent. The tire pressure monitoring system (TPMS) on the 2008-10 Mercury Mountaineer monitors the air pressure in the four road tires with wheel-mounted tire pressure sensors (TPS). Te sensors transmit radio frequency signals to the Smart Junction Box (SJB) approximately every 60 seconds when the vehicle speed exceeds 20 mph, and every six hours when the vehicle is stationary. Each tire pressure sensor transmission is compared against a low-pressure limit (pressure listed on vehicle certifcation label minus 25%, which will be about 6 psi to 9 psi). If it is determined that the tire pressure has fallen below this limit, the SJB sends a message to the instrument cluster, which then illuminates the low pressure warning indicator and displays the appropriate message(s) in the message center (if equipped). Te batery-operated tire pressure sensors are mounted to metal brackets (called cradles) on the wheels inside the tires. Te sensors are mounted 180 degrees from the valve stems. Te tire pressure sensor may be serviced separately, but the cradle and strap must be replaced together. Under the following conditions, the TPMS may not function properly: • Low tire pressure; • Te TPS is missing or damaged; • Spare tire is installed as a road wheel; • An incorrect TPS is installed; • Te TPS is installed incorrectly; • Non-OEM wheels are installed; • Non-OEM equipped run-fat tires are installed; or • Tere are other non-OEM modifcations (roll cages, service barriers, part racks, ladder racks, etc.). 76 TPMS warning indicators NOTE: As ambient temperature decreases by 10 degrees Fahrenheit, tire pressures decrease 1 psi. If tire pressures are not adjusted at cold temperature, the tire pressure may drop enough to be detected by the TPMS, which will activate the low pressure warning light. When the tire pressure warning light comes on solid and the message center displays "LOW TIRE PRESSURE," check the air pressure of all tires and adjust to the specifed cold pressure listed on the vehicle certifcation label (found on the driver's door or door pillar). Drive the vehicle at 20 mph for at least two minutes. Make sure the warning light goes of. If the warning light stays on, there is a malfunction in the TPMS. See appropriate manufacturer service information. When the tire pressure warning light fashes for 20 to 30 seconds afer a bulb check has been performed and the message center displays warning messages, there is a malfunction in the TPMS. See appropriate manufacturer service information. Reset procedures NOTE: If a TPS is replaced, it will need to be trained. Te TPMS is not afected by wheel and tire rotation. Drive the vehicle at 20 mph for at least two minutes. If the vehicle has been stationary for more than 30 minutes, the sensor will enter into a "sleep mode" and stop transmiting. A TPMS activation procedure may be needed. See the instructions for TPS activation. Make sure the warning light goes of. TPS training NOTE: In the following procedure, TPMS Activation Tool (P/N 204-363) or equivalent must be used. NOTE: Te TPS training procedure must be done on a single vehicle, in an area without radio frequency (RF) noise and at least three feet away from any other vehicle equipped with TPMS. RF noise is generated by electrical motor and appliance operation, cellular telephones and remote transmiters, power inverters and portable entertainment equipment. NOTE: A new TPS is shipped in an OFF mode (or battery saver mode), and must be turned ON before it can be trained. To turn the sensor on, infate the tire to the recommended infation pressure and wait at least two minutes, then continue with the sensor training procedure. Te sensor also can be activated using the TPMS activation tool. See TPS activation. 1. Turn the ignition switch to the OFF position, then press and release the brake pedal. 2. Turn the ignition switch from the OFF position to the RUN position three times, ending in the RUN position. Do not wait more than one minute between each key cycle. 3. Press and release the brake pedal. 4. Turn the ignition switch to the OFF position. 5. Turn the ignition switch from the OFF position to the RUN position three times, ending in the RUN position. Do not wait more than one minute between each key cycle. NOTE: It may take up to six seconds to activate a TPS. During this time, the activation tool must remain in place 180 degrees from the valve stem (see Figure 1). If a sensor does not respond to the activation tool, atempt to activate the same sensor using the activation tool. If the sensor still does not respond, move the vehicle to rotate the wheels at least one-quarter of a turn and attempt to activate the same sensor again. If the SJB does not recognize any one of the four TPSs during the tire training procedure, the horn will sound twice and the message center (if equipped) will display "TIRE NOT TRINED MTD August 2013