DTC P2123-00: Accelerator Position Sensor 1 Signal Circuit High Input: General Description

The Accelerator Pedal Sensor (APS) is a very important sensor which controls the fuel amount by transmitting the driver's accelerating intention to the PCM. The APS is divided into APS1, 2 because its reliability is important. The APS1, 2 are composed with the independent power and ground. APS2 shows the 1/2 output of the APS1 and decides the fault if the ratio of APS1, is different. When the APS1 is out of order, the signal of APS2 can be substituted instead of APS1 and vise versa.