Tire Monitoring System: Description and Operation: Overview

OVERVIEW

The RDW is a simple system that will warn the driver of pressure losses in one or more of the tires through the "Check Control" display.

The system measures the wheel speeds of all four tires and compares the speed of the diagonal wheels for the average speed. A rolling circumference value is calculated from the wheel speeds and this value is stored in the control module.

In the event of pressure loss, the rolling circumference of the affected tire is reduced. With this, the wheel speed of the tire increases and the control module will detect the change and post the warning in the Check Control matrix display.

An additional acoustical warning is sounded if the pressure loss is greater than 40%.

The tire pressure warning system is switched "ON" every time the ignition is switched "ON" and it can be switched OFF with the button on the lower dash to the right of the steering column.

NOTE: The system can only react to the pressures in the tires when the system is initialized, it cannot check for the correct inflation pressure.