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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P1271: Accelerator Pedal Position Sensor No. 1 & 2 Performance >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The Accelerator Pedal Position (APP) sensors No. 1 and No. 2 are located within the accelerator pedal assembly. Each sensor has a 5-volt reference circuit, a low reference circuit and a signal circuit.

The APP sensor provides the Engine Control Module (ECM) with a signal voltage proportional to accelerator pedal movement. The APP sensor No. 1 signal voltage at rest position is near the low reference and increases as the pedal is actuated. The APP sensor No. 2 signal voltage at rest position is about 5-volt reference and decreases as the pedal is actuated. DTC will set when the voltage difference between APP sensors No. 1 and No. 2 exceeds a predetermined value.

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