Diagnostic Aids
WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
Check for poor connections, corrosion, misrouted harness, rubbed-through wire insulation or broken wire inside insulation. The APP and TP sensor 5-volt reference circuit are internally connected within the TAC. Check the 5-volt reference circuits at the APP and TP sensors for an open, short to ground or short to voltage.