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.

   Pedal Position	Output Voltage (V) [Vref = 5.0V]
   	APS1	APS2
   C.T	0.7 ~ 0.8V	0.29 ~ 0.46V
   W.O.T	3.85 ~ 4.35V	1.93 ~ 2.18V

   Fig 1: Screen Display - Normal Waveform Of APS1 & APS2 With Acceleration

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 2: Accelerator Pedal Position Sensor Circuit Diagram

   Courtesy of HYUNDAI MOTOR AMERICA
4. 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 below.

   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 below.