Abs Operation Inspection: Notes

Wheel speed sensor output voltage inspection

1. Release parking brake after lifting vehicle.
2. Remove wheel speed sensor connector and measure current and voltage at the sensor side
   CAUTION: When measuring sensor output voltage, be sure to install resistance (R=115Ω) at wheel speed sensor to prevent sensor damaging. See Fig 1.
3. Rotate the wheel to be measured approximately 1/2 to 1 rotation per second, and check the operating current and voltage between No.1 and No.2 using a circuit tester or an oscilloscope.
   Fig 1: Wheel Speed Sensor Circuit Diagram

   Courtesy of KIA MOTORS AMERICA, INC.