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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.

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: Measuring Signal Waveform Of APS By Pressing And Depressing Accelerator Pedal

Courtesy of HYUNDAI MOTOR AMERICA

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.