Edmunds Answers

Answers

  • 0patience 01/31/09 4:22 pm PST

    The problem is the cold weather. The sensors work on temperature differential, as well as pressure.
    So when you first start out, the temperature may be 20 degrees. As you run down the road, the temperature starts to climb and will often reach as much as 90 degrees, even in cold weather. See the bulletin below, it gives a little more insight.


    TSB 06-3-7
    02/20/06
    LOW TIRE INDICATOR ON - TPMS SYSTEM SENSOR WAKE UP
    FORD:
    2003-2006 Expedition, Explorer
    2006 Escape Hybrid, Escape, Freestar
    LINCOLN:
    2003-2005 Aviator
    2003-2006 Navigator
    MERCURY:
    2003-2006 Mountaineer
    2006 Mariner Hybrid, Mariner, Monterey
    ISSUE
    Vehicles built with the tire pressure monitoring system (TPMS) sensors may experience a concern where the TPMS indicator is on solid and the message center (if equipped) displays "Low Tire Pressure". This may be due to the actual tire pressure being low due to time or temperature changes (10°= 1 psi). Adjusting the tire pressure to specification should turn out the warning light once the sensors have been awakened.
    ACTION
    If the vehicle has been stationary for more than 30 minutes, it will be necessary to wake up the sensors with the training tool to force them to transmit the latest air pressure information to the smart junction box (SJB), or responsible module. This can be done by either driving the vehicle for 2 minutes above 20 MPH (32 Km/h) or by using the training tool. The sensors do not continuously transmit when the vehicle is not moving.

ADVERTISEMENT

Top Ford Expedition Experts View More

Rank Leader Points
1. karjunkie 340
2. MrShift@Edmunds 300
3. zaken1 300
4. morin2 120
5. laltazan 60
6. texases 60
7. kiawah 55
ADVERTISEMENT