Circuit Description

WARNING: This page does not describe the selected car, but rather 54 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Sonoma, and 1999 GMC Savana Special. However, it is still accessible from the selected car via links, so may be relevant.

As a toothed ring passes by the Wheel Speed Sensor (WSS), changes in the electromagnetic field cause the wheel speed sensor to produce an AC voltage signal. Voltage signal frequency and amplitude are proportional to wheel speed. The magnitude of this signal is directly related to wheel speed and proximity of wheel speed sensor to toothed ring, often referred to as the air gap.

Conditions for setting DTC:

Average wheel speed for all wheel speed signals is greater than 25 MPH.
Average left front wheel speed is greater than 25 MPH.
No output from left front wheel speed signal for 15 milliseconds. Anything which suddenly prevents (intermittent) the right front wheel speed signal to drop to zero while vehicle is moving greater than 25 MPH.