Check APS

1. IG "OFF". Connect GDS.
2. Connect probe to APS 1 and APS 2 to check signal waveform by using oscilloscope function. Start engine.
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]
   	APS 1	APS 2
   C.T	0.7 ~ 0.8V	0.33 ~ 0.43V
   W.O.T	3.85 ~ 4.35V	1.93 ~ 2.18V

   Courtesy of HYUNDAI MOTOR AMERICA

4. Is the measured signal waveform normal?

YES 

• Substitute with a known - good ECM (PCM) and check for proper operation. If the problem is corrected, replace ECM (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.