Component Inspection

ESC switch Check
1. IG "OFF".
2. Disconnect the ESC switch connector.
3. Measure resistance between power terminal and signal terminal of the ESC switch connector.
4. Measure waveform between signal terminal of the wheel speed sensor harness connector and chassis ground with oscilloscope.
  Specification : Approx. below 1Ω - (In case of pressing the ESC switch)
  
  Approx. ∞ Ω - (In case of not pressing the ESC switch)
  
  Fig 1: Measuring Waveform Between Signal Terminal Of Wheel Speed Sensor Harness Connector And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
5. Is the measured value within specifications?
  YES
  - Fault is intermittent caused by poor connection in ESC switch harness and/or HECU's connector. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Substitute with a known-good ESC switch and check for proper operation. If problem is corrected, replace ESC switch and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.