Ford E9TZ-9B989-A Potentiometer - Engine Throttle

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The Throttle Position (TP) sensor is a potentiometer that provides a signal to the PCM that is directly proportional to the throttle plate position. The TP sensor is mounted on the side of the throttle body and is connected to the throttle plate shaft. The TP sensor monitors throttle plate movement and position, and transmits an appropriate electrical signal to the PCM. These signals are used by the PCM to adjust the air/fuel mixture, spark timing and EGA operation according to engine load at idle, part throttle, or full throttle. The TPS is not adjustable. To check the TP sensor, first disconnect the negative battery cable and disengage the wiring harness connector from the TP sensor. Using a Digital Volt-Ohmmeter (DVOM) set on ohmmeter function, probe the terminals, which correspond to the Brown/White and the Gray/White connector wires, on the TP sensor. Slowly rotate the throttle shaft and monitor the ohmmeter for a continuous, steady change in resistance. Any sudden jumps, or irregularities in resistance indicates a malfunctioning sensor. Reconnect the negative battery cable and turn the DVOM to the voltmeter setting. Detach the wiring harness connector from the PCM, then install a break-out box between the wiring harness connector and the PCM connector. Turn the ignition switch ON and using the DVOM on voltmeter function, measure the voltage between terminals 89 and 90 of the breakout box. The specification is 0.9 volts. If the voltage is outside the standard value or if it does not change smoothly, inspect the circuit wiring or replace the TP sensor. To remove and install the TP sensor, disconnect the negative battery cable and disengage the wiring harness connector from the TP sensor. Remove the two TP sensor mounting screws, then pull the TP sensor out of the throttle body housing. To install, position the TP sensor against the throttle body housing, ensuring that the mounting screw holes are aligned. Install and tighten the sensor mounting screws until snug. Attach the wiring harness connector to the sensor, then connect the negative battery cable. The TP sensor is not adjustable.

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.