DTC P1271: App Sensor 1-2 Performance: Description
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 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 1 housing. Three separate signal, low reference, and 5-volt reference circuits are used in order to interface the APP sensor with the Engine Control Module (ECM). Each sensor has a unique functionality to determine pedal position. See APP SENSOR POSITION VOLTAGE table. The 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 DTC sets if the ECM determines an out of range condition with the APP sensor.
APP SENSOR POSITION VOLTAGE
| APP Sensor | Actual Pedal Position | Percent Depressed On Scan Tool | Voltage On Scan Tool |
|---|---|---|---|
| 1 | Pedal At Rest | 0 | .52-.80 |
| 1 | Pedal At Full Travel | 100 | 2.12-2.65 |
| 2 | Pedal At Rest | 0 | 4.25-4.53 |
| 2 | Pedal At Full Travel | 100 | 2.40-2.93 |
| 3 | Pedal At Rest | 0 | 3.95-4.13 |
| 3 | Pedal At Full Travel | 100 | 2.76-3.16 |