Diagnostic Aids

Inspect throttle valve linkage and lever assembly for free and normal movement. A binding or misaligned throttle valve can affect TP sensor input. Ensure throttle lever has not been tampered with. Ensure throttle valve opens fully and the lever contacts the throttle stop. Scan tool typically displays TP angle of 8-10 percent at idle, to 76-77 percent at WOT.

An intermittent malfunction may be caused by a poor connection, rubbed-through wire insulation, or a wire broken inside insulation. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, or poor terminal-to-wire connections before component replacement.