Antilock Brake (ABS) Activation at Low Speeds (Clean Wheel Speed Sensor Mounting Surface)

Subject: Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface)

Models: - 2002-2006 Cadillac Escalade, Escalade EXT, -2003-2006 Cadillac Escalade ESV, - 1999-2006 Chevrolet Silverado, - 2001-2006 Chevrolet Suburban, Tahoe, - 2002-2006 Chevrolet Avalanche, - 2003-2006 Chevrolet Express, - 2007 Chevrolet Silverado Classic, - 1999-2006 GMC Sierra, - 2001-2006 GMC Yukon, Yukon Denali, Yukon XL, Yukon Denali XL, - 2003-2006 GMC Savana, - 2007 GMC Sierra Classic, - 2003-2006 HUMMER H2

Condition

Some customers may comment on ABS activation at low speeds, usually below 8 km/h (5 mph). Upon investigation, the technician will find no DTCs set.

Cause

The cause of this condition may be an increased air gap between the wheel speed sensor and the hub reluctor ring due to rust and debris built up on the sensor mounting surface.

Correction

Measure AC voltage and clean the wheel speed sensor mounting surfaces.

1. Raise and support the vehicle.

2. Disconnect both the front wheel speed sensor connectors at the frame and harness.

3. Place a Digital Volt Meter (DVM) across the terminals of each wheel speed sensor connector.

4. Rotate the wheel clockwise approximately one revolution per second. The minimum reading should be at least 350 ACmV's. If the reading is less than 350 ACmV's, remove the wheel speed sensor.

5. Plug the wheel speed sensor bore in order to prevent debris from falling into the hub during service. Download File PDF


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