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:

    â€¢ Check for proper installation of the wiring harnesses resulting from add-on options.
    â€¢ Visually inspect the wheel speed sensor and the toothed ring for the following conditions:
      â€¢ Looseness
      â€¢ Damage (Replace any damaged components)
      â€¢ Foreign material accumulation (Remove any foreign material)
      â€¢ Proper mounting (Properly attach all of the components).
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    â€¢ 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.
    â€¢ 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.
    â€¢ 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.