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 signal, low reference, and 5-volt 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 APP sensor 1 voltage should increase as the accelerator pedal is depressed, from below 0.7 volts at 0 percent pedal travel to 4.5 volts at 100 percent pedal travel. APP sensor 2 voltage should increase from above 0.3 volts at 0 percent pedal travel to 2.2 volts at 100 percent pedal travel.
