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:
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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 APP
sensor 1 voltage should increase as the accelerator pedal is
depressed, from below 0.7 V at 0% pedal travel to 4.5 V at 100%
pedal travel. APP sensor 2 voltage should increase from above 0.3 V
at 0% pedal travel to 2.2 V at 100% pedal travel.
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