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Home > TPMS News > Ford TPMS

TIRE PRESSURE MONITORING SYSTEM shopTPMS Background Beginning with the 2008 model year, all Crown Victoria Police Interceptors (CVPIs) are equipped with a Tire Pressure Monitoring System (TPMS) that illuminates a low tire pressure telltale (see Figure 1) on the instrument cluster when one or more of your tires is significantly under-inflated. Accordingly, when the low tire pressure telltale illuminates, you should stop and check your tires as soon as possible, and inflate them to the proper pressure. Driving on a significantly under-inflated tire causes the tire to overheat and can lead to tire failure. Under-inflation also reduces fuel efficiency and tire tread life, and may affect the vehicle’s handling and stopping ability. Understanding the Tire Pressure Monitoring System (TPMS) The TPMS measures pressure in your four road tires and sends the tire pressure readings to your vehicle. The Low Tire Pressure telltale will turn ON if the tire pressure in one or more tires is significantly low. Once the light is illuminated, your tires are under inflated and need to be inflated to the manufacturer’s recommended tire pressure. Even if the light turns ON and a short time later turns OFF, your tire pressure still needs to be checked. When inflating your tires When putting air into your tires (such as at a gas station or in your garage), the TPMS may not respond immediately to the air added to your tires. It may take up to two minutes of driving over 20 mph (32 km/h) for the light to turn OFF after you have filled your tires to the recommended inflation pressure. How temperature affects your tire pressure The TPMS monitors tire pressure in each tire on the road. While driving in a normal manner, a typical passenger tire inflation pressure may increase approximately 2 to 4 psi (14 to 28 kPa) from a cold start situation. If the vehicle is stationary over night with the outside temperature significantly lower than the daytime temperature, the tire pressure may decrease approximately 3 psi (20.7 kPa) for a drop of 30° F (16.6°C) in ambient temperature. This lower pressure value may be detected by the TPMS as being significantly lower than the recommended inflation pressure and activate the TPMS warning for low tire pressure. If the low tire pressure warning light is ON, visually check each tire to verify that no tire is flat. (If one or more tires are flat, repair as necessary.) Check air pressure in the road tires. If any tire is under-inflated, carefully drive the vehicle to the nearest location where air can be added to the tires. Inflate all the tires to the recommended inflation pressure. shopTPMS Changing tires with TPMS Each road tire, as well as the spare, is equipped with a tire pressure sensor fastened to the inside rim of the wheel (see Figure 2). The pressure sensor is covered by the tire and is not visible unless the tire is removed. The pressure sensor is located opposite (180 degrees) from the valve stem. Care must be taken when changing the tire to avoid damaging the sensor. When your spare tire is installed When one of your road tires has been replaced by the spare, the TPMS system will continue to identify an issue to remind you that the damaged road wheel/tire needs to be repaired and put back on the vehicle or that the installed spare needs to be "trained" to the vehicle. Note: Your spare tire has a sensor installed on the wheel, but the TPMS receiver must be "trained" to receive it. The receiver can only receive four signals, and the signal from each transmitter is digitally unique to avoid interference from transmitters on other nearby vehicles. Tire Rotation The TPMS sensors do not need to be retrained when tires are rotated if the same four wheels are used. TPMS System Training Tools An inexpensive TMPS training tool, P/N 8C2Z-1A203-A, can by purchased from any Ford dealer for use by the driver or shop technician for training the system after maintenance has been performed that requires system training. The Tire Pressure Monitor Activation Tool, P/N 204-363, has more functionality and is designed primarily for shop use. For either tool, follow the training instructions as outlined in the shop manual. How to tell when a wheel has a TPMS sensor inside All CVPI wheels since the 2006 model year have "Sensor may be inside" stamped on the inside of the wheel since some of the wheel components are used on other vehicle lines that incorporated TPMS before CVPIs did. However, the wheel's build date, at the end on the second line, is a good indicator of whether or not a CVPI wheel has a sensor installed. As production of the 2008 models began on May 7, 2007, a wheel build date of May 1 or later will most likely have a sensor installed. Alternatively, the Tire Pressure Monitor Activation Tool, P/N 204-363, can also be used to determine if a sensor is present in a wheel as it provides feedback to the operator by flashing a green LED when a sensor responds to the tool. System Malfunction When the system detects a malfunction, the telltale will flash for approximately one minute and then remain continuously illuminated. This sequence will continue upon subsequent vehicle start-ups as long as the malfunction exists. When the malfunction indicator is illuminated, the system may not be able to detect or signal low tire pressure as intended. TPMS malfunctions may occur for a variety of reasons, including the installation of replacement or alternate tires or wheels on the vehicle that prevent the TPMS from functioning properly. Always check the TPMS malfunction telltale after replacing one or more tires or wheels on your vehicle to ensure that the replacement or alternate tires and wheels allow the TPMS to continue to function properly. Please refer to the Owner Guide for more details.