Electromagnetic Interference

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:
^ Visually inspect for looseness.
^ Visually inspect for damage.
^ Visually inspect for foreign material accumulation.
^ Visually inspect for proper mounting.
^ Replace any damaged components. Remove any foreign, material and properly attach all components.
^ Refer to ABS Component Views for proper wheel speed sensor wire routing.
^ Use special tool J 39?00 DMM to measure the resistance of the spark plug boots. Refer to Spark Plug Wires Not Operating Properly in Starting and Charging or Powertrain Management for proper spark plug wire resistance.
^ 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.