Description and Operation

Description

• Tire Inflation / Leak Warning

  

1. 1
   Turn-on condition

   • When tire pressure is below the threshold
   • When the sensor detects a rapid leak.
   • Indicates that the tire must be inflated again to the pressure specified on the tire placard. / Repair.
2. 2
   Turn-off condition

   • Under-inflation; when tire pressure is above (warning threshold + hysteresis).
   • Rapid leak; when tire pressure is above (leak warning threshold).
3. 3
   Turn-on condition

   • When the system detects a malfunction that is external to the receiver/sensor.
   • When the system detects a receiver malfunction.
   • When the system detects a sensor malfunction.
4. 4
   Turn-off condition

   • A DTC is set, the malfunction persists until the symptom is cleared, and the DTC warning lamp illuminates. The lamp turns off if both conditions clear and the DTC is stored in history.
   • "Non-critical" malfunctions are those that may occur temporarily, for example, when battery voltage drops. Therefore, the lamp turns off when the DTC clear condition occurs.

1. General Function
   • The system monitors a number of inputs over time to determine whether a malfunction is present.
   • Malfunctions are ranked according to which is the most likely cause.
   • Some malfunctions are not covered by DTCs. The main ones are:

   a. Thermal shutdown of sensor (above 257°F/125 °C). b. Stuck ignition line; requires lamp observation at ignition ON for diagnosis.