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:
- Any wheel speed differing from the vehicle speed for any of the following causes:
- One mismatched wheel speed more than double or less than half the other 3 wheel speeds.
- All 4 wheel speeds differing from each other by 8 percent.
- Vehicle speed greater than 12 MPH.
- No unexpected wheel acceleration. Anything that generates consistent differences between wheel speed signals.