Signal Circuit 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 wheel speed sensor signal terminal of the HECU harness connector and chassis ground with oscilloscope.
  Specification : High: 1.18~1.68V, Low: 0.59~0.84V
  
  Fig 1: Measuring Waveform Between Wheel Speed Sensor Signal Terminal Of HECU Harness Connector & Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
5. Is the measured waveform within specifications?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Repair open or short in signal circuit between HECU harness connector and wheel speed sensor harness connector, and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    If there is no problem in signal circuit, go to "COMPONENT INSPECTION " procedure.