Circuit Description

The toothed wheel generates a voltage pulse as it moves past the sensor. Each tooth-gap-tooth series on the wheel generates the pulses. The electronic brake control module (EBCM) uses the frequency of these pulses to determine the wheel speed. The voltage generated depends on the air gap between the sensor and the toothed wheel, and on the wheel speed.

This procedure inspects for a malfunctioning wheel speed sensor (WSS), a short to ground or to voltage in the wiring, or a contact problem in a connector.