Subaru Legacy Outback 2.5L Tech Tip: ABS Motor On, Pedal Descends, But Doesn’t Run – UnderhoodService
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Subaru Legacy Outback 2.5L Tech Tip: ABS Motor On, Pedal Descends, But Doesn’t Run

Customer Concern: When you come to a stop, just before completely stopped, the ABS motor kicks on and the pedal goes down, then comes back up. Doesn’t matter what kind of stop. Always does it right before the vehicle is completely stopped. No codes are present.

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Vehicle Application: 1999 Subaru Legacy Outback 2.5L

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Tests/Procedures:
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.

Potential Causes:

• 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.

Tech Tips:

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.

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Courtesy of Identifix, Inc.

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