Genuine Ford Explorer Sport Trac Throttle Position Sensor

Ford Explorer Sport Trac Throttle Position Sensor Parts Questions & Experts Answers

• Engine Throttle Potentiometer
  F4SZ-9B989-AA
  Q: How to troubleshoot the Throttle Position Sensor (TPS) on Ford Explorer Sport Trac?

  A:

  When 2001 and newer models give driveability trouble, a working sensor that tests fine means you need to look for breaks or short circuits in the wiring harness between the sensor and PCM. If you cannot find any problems, talk to your dealership's service department or a qualified repair store. The Throttle Position Sensor (TPS) works like a variable-wire potentiometer on the throttle body, sending voltage signals to the PCM (powertrain control module) to tell how far and how fast the throttle moves. If the PCM gets incorrect throttle movement information from the TPS, it causes your car to act up by suddenly accelerating, stopping, and engaging the engine in aggravating idles. Start testing the TPS by disconnecting its electrical connection, and measure its reference voltage. It must be 5.0 volts plus or minus 0.1 volts with the engine turned on. Touch the sensor to the shifter again, then check that the port gives 0.5 to 1.5 volts when the throttle is closed and 4.0 to 5.0 volts when it opens completely. When the ignition is on, the TPS electric signal changes from under 1.5 volts all the way to about 5.0 volts during throttle movements. Contact a professional to look into the sensor if these tests show the problem is still there. Some voltage drops may not show up when you check with a voltmeter. You can't adjust the TPS; to replace it on 2001 and newer Ford Explorers, first undo all the bolts around the snow shield. Disconnect the wiring, and carefully unscrew 2 more bolts to fully detach the TPS from the throttle body. Reconnect everything after fitting in the new sensor properly into the throttle shaft.