Component Inspection

Wheel speed sensor circuit check
1. Lift the vehicle.
2. Ignition "ON" & Engine "OFF".
3. Turn the wheel by hand.
4. Measure waveform between signal terminal of the wheel speed sensor harness connector and chassis ground with oscilloscope.
  Specification : High: 1.18-1.68V, Low: 0.59-0.84V
  
  Fig 1: Measuring Waveform Between Signal Terminal Of Wheel Speed Sensor Connector And Ground
  Courtesy of KIA MOTORS AMERICA, INC.
5. Is the measured waveform within specifications?
  YES
  - Fault is intermittent caused by faulty HECU, wheel speed sensor or external noise, an interference between harnesses, was repaired and HECU memory was not cleared.
    Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
    
    Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    
    If there is no problem in signal circuit, Substitute with a known-good HECU and check for proper operation.
    
    If problem is corrected, replace HECU and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Check for improper installation of wheel speed sensor. If NG, repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    Check for damage of rotor teeth or wheel bearing. If NG, repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    
    Substitute with a known-good Wheel speed sensor and check for proper operation.
    
    If problem is corrected, replace Wheel speed sensor and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.