Silverado Classic 2500 4WD V8-6.6L DSL Turbo (2007)
Accelerator Pedal Position Sensor: Description and Operation
ACCELERATOR PEDAL POSITION SYSTEM DESCRIPTION
ACCELERATOR PEDAL POSITION (APP) SENSOR
1 - Accelerator Pedal Position (APP) Sensor Connector
2 - Accelerator Pedal Position (APP) Sensor
The accelerator pedal position (APP) system along with the vehicle electronics and components is used to calculate and control the amount of
acceleration and deceleration via fuel injector control. This eliminates the need for a mechanical cable attachment from the accelerator pedal to a
throttle body.
The APP system includes, but is not limited to, the following components :
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The APP sensor assembly
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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 1.0 volt at 0 pedal travel to above 4 volts at 100 percent pedal travel. APP sensor 2 voltage should increase from above 0.43 volts at 0
pedal travel to above 2.0 volts at 100 percent pedal travel.
