Circuit Description
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The accelerator pedal position (APP) sensor is mounted on the accelerator pedal control assembly. The sensor is made up of 3 individual sensors within one housing. Three separate signal, low reference, and 5-volt reference circuits are used in order to interface the APP sensor with the ECM. Each sensor has a unique functionality to determine pedal position as shown in the table below. The engine control module (ECM) uses the APP sensor to determine the amount of acceleration or deceleration desired by the person driving the vehicle via fuel injector control. This diagnostic trouble code (DTC) sets if the ECM detects a condition with more than one sensor within the APP sensor.
APP Sensor Position Table
| APP Sensor | Actual Pedal Position | % Depressed as Observed on a Scan Tool | Voltage as Observed on a Scan Tool |
|---|---|---|---|
| 1 | Pedal at rest | 0 | .52 -.80 |
| 1 | Pedal at full travel | 100 | 2.12 - 2.78 |
| 2 | Pedal at rest | 0 | 4.25 - 4.53 |
| 2 | Pedal at full travel | 100 | 2.24 - 2.93 |
| 3 | Pedal at rest | 0 | 3.95 - 4.13 |
| 3 | Pedal at full travel | 100 | 2.69 - 3.16 |