GM Service Manual Online
For 1990-2009 cars only

ABS components are sensitive to Electromagnetic Interference (EMI).

Perform the following checks if an intermittent malfunction is suspected:

    • Check for proper installation of the wiring harnesses resulting from add-on options.
    • Visually inspect the wheel speed sensor and the toothed ring for the following conditions:
      • Looseness
      • Damage (Replace any damaged components)
      • Foreign material accumulation (Remove any foreign material)
      • Proper mounting (Properly attach all of the components).
      • 
      • 
    • Check for proper routing of the front wheel speed sensor wiring near the spark plug wires. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
    • Use the DMM J 39200 in order to measure the resistance of the spark plug wires.
        If the displays J 39200 Infinite or greater than 30,000 ohms for any wire, replace the spark plug wires. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
    • While test driving the vehicle, monitor the Scan Tool wheel speeds. If any wheel speed drops or becomes erratic, refer to the appropriate wheel speed DTC.