Vehicle Application: 1999 Subaru Legacy Outback 2.5L
1. Inspect the sensor rings on the front axles. Look for these to be out of place, cracked or damaged.
2. Use a multi-channel DSO to compare wheel speed signals to each other. You are looking for the signal with less amplitude.
• Sensor Ring — The sensor ring is damaged or out of place.
• Contaminated Wheel Speed Sensor (WSS) — Metallic dust is built up on the wheel speed sensor.
False activation of the ABS. The ABS control unit sees a difference in wheel speed at low speed. The ABS is actuated as a result.
Courtesy of Identifix, Inc.