Throttle Position (TP) Sensor

TP sensor is a variable resistor mounted on the throttle body and connected directly to the throttle shaft. TP sensor signal informs ECM of actual throttle position and rate of change in throttle position. ECM cross checks TP sensor output with Mass Airflow (MAF) sensor output. If values from these two sensors do not agree and fuel injection feedback indicates correct air/fuel mixture, ECM assumes MAF sensor is correct and TP sensor has failed.

If TP sensor fails or gives an inconsistent response there will be noticeable driveability problems, including acceleration performance and poor engine idle. ECM will supply a default value. If failure occurs in the closed position, ECM will initiate over-run fuel cut off when engine speed is 1750 RPM or more. A fault is indicated by illumination of the MIL.