GM Service Manual Online
For 1990-2009 cars only

The ABS components are sensitive to electromagnetic interference (EMI). Perform the following checks if an intermittent malfunction is suspected:

    • Check for proper installation of wiring harnesses resulting from add-on options.
    • Visually inspect the wheel speed sensor and the toothed ring for the following conditions. Remove any foreign material and replace any damaged components. Properly attach all components.
       - Looseness.
       - Damage.
       - Foreign material accumulation.
       - Proper mounting.
    • Check for proper routing of the wheel speed sensor wiring near spark plug wires.
    • Use a Digital Multimeter (DMM) to measure the resistance of the spark plug wires.
    • Monitor the scan tool wheel speeds while test driving the vehicle. Refer to the appropriate wheel speed DTC if any wheel speed drops or displays an erratic speed.