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Home >> Hyundai >> 2017 >> Santa Fe XL Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System Diagnosis (3 Of 3) >> DTC P2128: Accelerator Position Sensor 2 Signal Circuit-High Input >> Component Inspection >> Check APS
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Check APS

  1. IG "OFF". Connect GDS.
  2. Connect probe to APS1 and APS2 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]
    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: Scantool Display - Normal Waveform Of APS1 & APS2 With Acceleration
    G12038043Courtesy of HYUNDAI MOTOR AMERICA
  4. Is the measured signal waveform normal?

    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.
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