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Faulty Wheel Speed Sensor Output

  1. Test each sensor. See WHEEL SPEED SENSOR TEST  under COMPONENT TESTING. If all sensor voltages and resistances are within specification, go to next step. If any sensor is malfunctioning, replace sensor. See WHEEL SPEED SENSOR  under REMOVAL & INSTALLATION.
  2. Measure each wheel speed sensor-to-rotor gap. Refer to WHEEL SPEED SENSOR ADJUSTMENT . If all gaps are within specification, go to next step. If any gaps are not within specification, adjust sensor-to-rotor gap.
  3. Inspect all wheel speed sensor rotors for damaged and missing teeth. Replace any damaged rotors. Using an oscilloscope, check waveform patterns. See Fig 1. If all rotors are okay, replace ECU and road test vehicle. Ensure trouble code does not reset.
Fig 1: Identifying Abnormal ABS Rotor Waveform Patterns
G93B00266Courtesy of CHRYSLER MOTORS.
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