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Accelerator Pedal Position System Description

Accelerator Pedal Position System Description


The accelerator pedal position (APP) system along with the engine control module (ECM) and other components is used to calculate and control the amount of acceleration and deceleration by controlling the amount of fuel delivery.

The APP system includes the following components:


• The APP sensor assembly

• The engine control module (ECM)


Accelerator Pedal Position (APP) Sensor

The APP sensor is mounted on the accelerator pedal control assembly. The sensor is made up of 2 individual sensors within one housing. Two separate signals, low reference, and 5 V reference circuits are used in order to interface the accelerator pedal sensor assembly with the engine control module (ECM). Each sensor has a unique functionality to determine pedal position. The ECM uses the APP sensor to determine the amount of acceleration or deceleration desired by the person driving the vehicle. The voltage in APP sensor 1 should rise when the accelerator pedal is depressed, from below 0.7 V at 0% pedal travel to 4.5 V at 100% pedal travel. The voltage in APP sensor 2 should increase from over 0.3 V at 0% pedal travel to 2.2 V at 100% pedal travel.