AutoZone 1997 Toyota Truck T100 Pickup 4WD 3.4L EFI DOHC 6cyl | Repair Guides | Engine Performance & Emission Controls | Components & Systems | Throttle Position Sensor | AutoZone.com

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    1997 Toyota Truck T100 Pickup 4WD 3.4L EFI DOHC 6cyl

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    Ford Excursion, Expedition, Lincoln Navigator 2000-2005

    Throttle Position Sensor

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    Operation



    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 EGR operation according to engine load at idle, part throttle, or full throttle. The TP sensor is not adjustable.

    The TP sensor receives a 5 volt reference signal and a ground circuit from the PCM. A return signal circuit is connected to a wiper that runs on a resistor internally on the sensor. The further the throttle is opened, the wiper moves along the resistor, at wide open throttle, the wiper essentially creates a loop between the reference signal and the signal return returning the full or nearly full 5 volt signal back to the PCM. At idle the signal return should be approximately 0.9 volts.

    Removal & Installation



    1. Remove the throttle body (TB).
      WARNING
      Failure to remove the TP sensor screws in the following manner will result in damage to the screws. First loosen the screws 1-2 full turns using a hand tool and then use a suitable high speed driver to complete the removal.

    2.  
    3. Remove and discard the screws and the TP sensor.
      WARNING
      Do not reuse the TP sensor and screws. A new TP sensor and screws must be installed.


      NOTE
      When installing the new TP sensor, make sure that the radial locator tab on the TP sensor is aligned with the radial locator hole on the throttle body.

    4.  
    5. To install, reverse the removal procedure and note the following:
      1. Tighten the new sensor screws to 27 inch. lbs. (3 Nm).
      2.  

    6.  

    5.4L & 6.8L Engines
    1. Disconnect the battery ground cable.
    2.  
    3. Loosen the clamp and position the air cleaner outlet tube aside.
    4.  
    5. Remove the accelerator cable snow shield.
    6.  
    7. To remove the throttle position (TP) sensor.
      1. Disconnect the electrical connector.
      2.  
      3. Remove the screws.
      4.  
      5. Remove the TP sensor.
      6.  

    8.  
    9. To install, reverse the removal procedure.
    10.  

    Testing





    Click image to see an enlarged view

    Fig. TESTING the TP sensor signal return voltage at idle



    Click image to see an enlarged view

    Fig. Test the operation of the TP sensor by gently opening the throttle while observing the signal return voltage. The voltage should move smoothly according to the amount the throttle is opened



    Click image to see an enlarged view

    Fig. TESTING the supply voltage at the TP sensor connector



    Click image to see an enlarged view

    Fig. The TP sensor can be monitored with an appropriate and Data-stream capable scan tool

    1. With the engine OFF and the ignition ON, check the voltage at the signal return circuit of the TP sensor by carefully backprobing the connector using a DVOM.
    2.  
    3. Voltage should be between 0.2 and 1.4 volts at idle.
    4.  
    5. Slowly move the throttle pulley to the wide open throttle (WOT) position and watch the voltage on the DVOM. The voltage should slowly rise to slightly less than 4.8v at Wide Open Throttle (WOT).
    6.  
    7. If no voltage is present, check the wiring harness for supply voltage (5.0v) and ground (0.3v or less), by referring to your corresponding wiring guide. If supply voltage and ground are present, but no output voltage from TP, replace the TP sensor. If supply voltage and ground do not meet specifications, make necessary repairs to the harness or PCM.
    8.  

     
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