Component Inspection

■ Wheel speed sensor circuit check 

1. Lift the vehicle.
2. IG "ON".
3. Turn the wheel by hand.
4. Measure waveform between signal terminal of the wheel speed sensor (FL) harness connector and chassis ground with oscilloscope.

   Specification  : High: Approx. 11.5V, Low: approx. 10.9V (the voltage could be varied with battery voltage)

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. 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.

Fig 1: Checking For Damage Of Rotor Teeth Or Wheel Bearing

Courtesy of HYUNDAI MOTOR AMERICA

• Check for damage of rotor teeth or wheel bearing. If NG, repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

Fig 2: Checking For Proper Operation Of Wheel Speed Sensor

Courtesy of HYUNDAI MOTOR AMERICA

• 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.