Component Inspection

Wheel speed sensor circuit check
1. Lift the vehicle with suitable lift.
2. IG "ON" and place gear in neutral position.
3. Turn the wheel by hand.
4. Measure waveform between wheel speed sensor signal terminal of the HECU harness connector and chassis ground in the oscilloscope with GDS using VMI.
  Specification: High: Approx. 1.4V, Low: Approx. 0.7V
  
  Fig 1: Normal Signal Waveform Of Wheel Speed Sensor
  Courtesy of KIA MOTORS AMERICA, INC.
5. Is the measured waveform within specifications?
  YES
  - Fault might be intermittent caused by faulty HECU, wheel speed sensor or external noise, an interference between harnesses. 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.
  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.