DTC P1227: Accelerator Pedal Position Sensor 2 Circuit Low Input Or DTC P1228: Accelerator Pedal Position Sensor 2 Circuit High Input: Description

WARNING: This page is about a different car, the 2002 Nissan Maxima and 2002 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.

The Accelerator Pedal Position (APP) sensor is installed on the upper end of the accelerator pedal assembly. The sensor detects the accelerator pedal position and sends a signal to the ECM.

APP sensor has 2 sensors. These sensors are a kind of potentiometers which transform the accelerator pedal position into output voltage, and emit the voltage signal to the ECM. See Figure . In addition, these sensors detect the opening and closing speed of the accelerator pedal and feed the voltage signals to the ECM. The ECM judges the current opening angle of the accelerator pedal from these signals and controls the throttle control motor based on these signals.

Idle position of the accelerator pedal is determined by the ECM receiving the signal from the APP sensor. The ECM uses this signal for engine operation such as fuel cut.