DTC P1280: Accelerator Pedal Position Sensor 2 Circuit: Description

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The accelerator pedal assembly contains two Accelerator Pedal Position (APP) sensors with two independent 5-volt supplies, two independent grounds, and two independent signal circuits that vary resistance according to changes in accelerator pedal position. The ECM measure the signal voltage from each APP sensor, which are reduced values of the ECM 5-volt references. As the accelerator pedal moves from the rest to full position, the voltage on APP sensor 1 signal increases from 0.94 to 4.25 volts, while the voltage on APP sensor 2 signal decreases from 4.55 to 2.90 volts. The ECM monitors each APP signal circuit for faults, as well as a performing comparison check between the sensor 1 and 2 signals. DTC P1275 will set if APP sensor 2 signal voltage at ECM is outside calibrated voltage value.