Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- APP sensor 1 and APP sensor 3, 5-volt reference circuits are internally connected within the ECM.
- The APP sensor 2, 5-volt reference circuit is shared with the barometric pressure (BARO) sensor and the turbo boost solenoid and they are internally connected within the ECM.
- If an intermittent condition is suspected, see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.