Component Inspection

Check APS

IG "OFF" and install a GDS.
Connect probe to APS1 and APS2 to check signal waveform by using oscilloscope function.

Measure signal waveform of APS by pressing and depressing accelerator pedal.

Specification: Signal waveform will be displayed as follows.

Fig 1: APS1 & APS2 Normal Waveform (With Acceleration)

Courtesy of HYUNDAI MOTOR AMERICA

Fig 2: Measuring APS1 & APS2 Signal Waveforms

Courtesy of HYUNDAI MOTOR AMERICA

Is the measured signal waveform O.K?
YES
- Substitute with a known - good PCM and check for proper operation. If the problem is corrected, replace PCM 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.