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Component Inspection

Check APS

IG "OFF" and install a scantool.
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.

OUTPUT VOLTAGE REFERENCE CHART

Pedal Position	Output Voltage(V) [Vref = 5.0V]
Pedal Position	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: Normal Waveform Of APS1 & APS2 With Acceleration

G07252361

Courtesy of HYUNDAI MOTOR CO.

Fig 2: Measuring Signal Waveform Of APS

G07252362

Courtesy of HYUNDAI MOTOR CO.

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.
  NOTE: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by ECM. Before or after testing ECM on the vehicle, use this function to reuse the ECM on the others
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.