Test NTC-17: Checking Throttle Position Sensor Calibration
NOTE:
Possible causes are: Throttle Position (TP) sensor voltage less than 3.4 volts at Wide Open Throttle (WOT), TP sensor voltage change not smooth, throttle cable binding or TP sensor voltage 1.5 volts or more with throttle closed.
NOTE:
After making any repair during this testing procedure, perform TEST VER-2A: ROAD TEST FOR NON-OBD II
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- Turn ignition off. Check throttle cable, cruise control cable (if equipped) and throttle valve on throttle body for binding. If no binding exists, go to next step. If binding exists, repair or replace components as necessary.
- Turn ignition on. Ensure throttle is fully closed and against throttle stop screw. Using scan tool, observe Throttle Position (TP) sensor voltage while slowly moving throttle from closed position to fully open position. If TP sensor voltage is at least 3.4 volts with throttle fully open, go to next step. If TP sensor voltage is not at least 3.4 volts with throttle fully open, replace TP sensor.
- Using scan tool, monitor TP sensor voltage while slowly moving throttle from closed position to fully open position. If TP sensor voltage changes smoothly, go to next step. If TP sensor voltage does not change smoothly, replace TP sensor.
- Ensure throttle is fully closed and against throttle stop screw. Using scan tool, observe TP sensor voltage. If TP sensor voltage is 1.5 volts or less with throttle fully closed, test is complete. If TP sensor voltage is more than 1.5 volts with throttle fully closed, replace TP sensor.