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DTC 21 - Faulty Wheel Speed Sensor Output

NOTE: If after all testing procedures have been completed system is not functioning properly, substitute ECU with known-good unit and retest.
  1. DTC will set if ECU detects wheel speed sensor has no output signal. DTC will also set if wheel sensor voltage output is low while driving vehicle.
  2. Inspect all wheel speed sensor rotors for damaged and missing teeth. Replace any damaged rotors. Using an oscilloscope, check waveform patterns. See Figure. If all rotors are okay, go to next step.
  3. Test wheel speed sensor. See WHEEL SPEED SENSOR TESTING . Replace wheel sensor as necessary. Ensure wheel speed sensor-to-rotor gap is within specification. See WHEEL SPEED SENSOR  under ADJUSTMENTS.
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