Ford E9TZ-9B989-A Potentiometer - Engine Throttle

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The Throttle Position (TP) sensor is a potentiometer that gives a signal to the PCM which is proportional to the throttle plate position. It observes the movements of the throttle plate and sends an electrical signal to the PCM thereby adjusting for air/fuel mixture, spark timing, and EGA operation. To check the TP sensor, disconnect the battery and touch the DVOM leads to terminals. Rotate the throttle shaft and watch the ohmmeter for even resistance. The TP sensor has malfunctions if it produces irregular readings. Using a breakout box, measure the voltage between terminals 89 and 90. If it exceeds the standard value, inspect the wiring or replace the TP sensor. To remove/replace the TP sensor, disconnect the battery, remove mounting screws, and locate the sensor against the throttle body housing.

EEC-IV power relay and ground checks are essential to prevent confusion and inaccurate diagnosis. They provide battery power (VPWR) to various fuel-related components and sensors.