Throttle Position Sensor: Testing and Inspection

SCAN TOOL DIAGNOSIS
The Tech 1 scan tool displays throttle position in volts and percentage of throttle blade opening. The value should display between about 0.3 - 0.9 volts with the throttle closed and ignition "ON," or at idle. Voltage should increase at a steady rate as the throttle is moved toward Wide Open Throttle (WOT) (about 4.6 volts).