Accelerator Position Sensor (APS)
The Accelerator Position Sensor (APS) is a very important sensor which controls the fuel amount by transmitting the driver's accelerating intention to the ECM. 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, 2 is different. When the APS1 is out of order, the signal of APS2 can be substituted instead of APS1 and vise versa.