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DTC P2128-00: Accelerator Position Sensor 2 Signal Circuit-High Input: Specification

Pedal Position Output Voltage (V) [Vref = 5.0V]
APS1 APS2
C.T 0.7 ~ 0.8V 0.33 ~ 0.43V
W.O.T 3.85 ~ 4.35V 1.93 ~ 2.18V

Signal Waveform & Data 

G13553302Courtesy of HYUNDAI MOTOR AMERICA
G13553303Courtesy of HYUNDAI MOTOR AMERICA

Signal waveform of APS 1 & 2 shows that APS 2 increases voltage just half of APS 1 voltage increase when accelerating.