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TPMS Indicator Illuminates Continuously

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

The TPMS indicator remains on continuously for the three following conditions:

CAUTION: Use only special tool 204-354 anytime tire pressures are measured to be sure that accurate values are obtained.
CAUTION: Place the air chuck straight on the valve stem to inflate the tire. Do not cock the air chuck during the inflation cycle. Doing so can damage the valve stem and cause air leaks.
CAUTION: Ford recommends using a round head air chuck on tire pressure sensors; it is not recommended to use air chucks with long shanks. Doing so can cause tire pressure sensor valve stem damage and loss of tire pressure.
Fig 1: Caution For Not Using Air Chucks With Long Shanks
G03180137Courtesy of FORD MOTOR CO.
  1. Low Tire Pressure - The TPMS indicator is illuminated solid and message center displays CHECK TIRE PRESSURE (if equipped). This is displayed when any of the tire pressures are low. Tire pressure must be adjusted to the recommended cold placard pressure. ADJUST the air pressure in tires. DO NOT train the tire pressure sensors at this time.
  2. Very Low Tire Pressure - The TPMS indicator is illuminated solid and the message center displays WARNING-TIRE VERY LOW (if equipped). This is displayed when one or more tires have very low pressure. When this warning message is displayed, a warning chime sounds reminding you to stop the vehicle as soon as safely possible and check the tires for correct pressure, and for leaks or damage. Tire pressure must be adjusted to the recommended cold placard pressure. ADJUST the air pressure in tires. DO NOT train the tire pressure sensors at this time.
  3. No Communication with the TPMS Module - The TPMS indicator is illuminated when the instrument cluster (IC) has received no signals from the TPMS module for more than 5 seconds. If equipped, the message center displays TIRE PRESSURE MONITOR FAULT. GO to SYMPTOM CHART 

Refer to MODULE COMMUNICATIONS NETWORK for diagnosis of the SCP bus.

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