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Faulty Wheel Speed Sensor Output

  1. Test each sensor. See WHEEL SPEED SENSOR under COMPONENT TESTING  . If all sensor voltages and resistances are within specification, go to next step. If any sensor is malfunctioning, replace speed sensor. See WHEEL SPEED SENSOR under REMOVAL & INSTALLATION  .
  2. Check each wheel speed sensor-to-rotor gap. See WHEEL SPEED SENSOR under ADJUSTMENTS  . 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 wave-form patterns. See Fig 1 . If all rotors are okay, replace ECU. Ensure trouble code does not reset.
Fig 1: Identifying Abnormal ABS Rotor Wave-Form Patterns
G93B00266Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
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