Component Inspection

Check APS
1. IG "OFF" and install a GDS.
2. Connect probe to APS1 and APS2 to check signal waveform by using oscilloscope function.
3. Measure signal waveform of APS by pressing and depressing accelerator pedal.
  Specification: Signal waveform will be displayed as follows.
  
  Fig 1: Measuring Signal Waveform Of APS By Pressing And Depressing Accelerator Pedal
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured resistance within specification?
  YES
  
  Substitute with a known - good ECM and check for proper operation. If the problem is corrected, replace ECM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  
  NO
  
  Substitute with a known-good APS and check for proper operation. If the problem is corrected, replace APS and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.