Signal Circuit Inspection

■ Wheel speed sensor circuit check 

1. Lift the vehicle.
2. IG "ON".
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 And Chassis Ground

   Courtesy of HYUNDAI MOTOR AMERICA
5. Is the measured waveform within specifications?

   YES 

   • Fault is intermittent caused by poor connection in wheel speed sensor harness (FR) and/or HECU's connector or was repaired and HECU memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair " 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.