AutoZone 2003 Audi Allroad Quattro 2.7L Turbo DOHC 6cyl | Repair Guides | Engine Performance & Emission Controls | Components & Systems | Throttle Position Sensor | AutoZone.com

Search suggestions

    My Vehicles

    2003 Audi Allroad Quattro 2.7L Turbo DOHC 6cyl

    Find a Store

    Select Store

    GET A $25 GIFT CARD FOR EVERY $100 SPENT ON ONLINE SHIP TO HOME ORDERS.

    Use Code: SALE25

    See Details

    Ford Freestyle 2005

    Throttle Position Sensor

    Print

    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 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.

    Click image to see an enlarged view

    Fig. TESTING the SIG circuit to the TP sensor



    Click image to see an enlarged view

    Fig. TESTING the SIG RTN circuit of the TP sensor



    Click image to see an enlarged view

    Fig. TESTING the operation of the potentiometer inside the TP sensor while slowly opening the throttle



    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.  

    Removal & Installation



    1. Disconnect the negative battery cable.
    2.  
    3. Disconnect sensor electrical connector.
    4.  
    5. Remove the 2 screws and the sensor.
    6.  

    To install:

    1. Installation is the reverse of removal.
    2.  

    Testing



    1. Check the condition of the connector. Make sure the connector is firmly attached. Check for broken or bent connector pins. Repair any connector damage before continuing with troubleshooting the issue.
    2.  
    3. Check the condition of the wiring to the connector. If the wiring is damaged, repair the wiring before continuing with any further tests.
    4.  
    5. The battery should be fully charged and the starting system should be functioning properly.
    6.  
    7. Key in OFF position.
    8.  
    9. Remove the inlet tube from the throttle body.
    10.  
    11. Visually inspect for throttle plate obstructions or sludge.
    12.  
    13. Slowly, push the throttle plate to wide open and release.
    14.  
    15. The throttle plate should move freely to wide open and back. Repair as needed.
    16.  
    17. ETBTPS connector disconnected.
    18.  
    19. Key ON, engine OFF.
    20.  
    21. Measure the voltage between the positive ETCREF terminal on the ETBTPS connector on the harness side and the negative ETCRTN terminal on the ETBTPS connector on the harness side. There should be 4-6 volts.
    22.  
    23. There are 2 types of ETBTPS available. Look at the sensor housing of the ETBTPS on the vehicle and compare to the accompanying illustrations.

      Click image to see an enlarged view

      Fig. Type 1 ETBTPS



      Click image to see an enlarged view

      Fig. Type 2 ETBTPS

    24.  
    25. Check the resistance of the type 1 ETBTPS as follows:
      1. Key in OFF position.
        NOTE
        Do not move the throttle plate during the resistance measurement. Measure the sensor resistance with the throttle plate at the default position.

      2.  
      3. ETBTPS connector disconnected.
      4.  
      5. Measure the resistance between the positive TP 1 terminal on the ETBTPS connector component side and the negative ETCREF terminal on the ETBTPS connector component side. The resistance should be 1,100-3,500 ohms.
      6.  
      7. Measure the resistance between the positive TP 1 terminal on the ETBTPS connector component side and the negative ETCRTN terminal on the ETBTPS connector component side. The resistance should be 2,500-5,900 ohms.
      8.  
      9. Measure the resistance between the positive TP 2 terminal on the ETBTPS connector component side and the negative ETCREF terminal on the ETBTPS connector component side. The resistance should be 1,800-4,900 ohms.
      10.  
      11. Measure the resistance between the positive TP 2 terminal on the ETBTPS connector component side and the negative ETCRTN terminal on the ETBTPS connector component side. The resistance should be 800-2,800 ohms.
      12.  
      13. Measure the resistance between the positive ETCREF terminal on the ETBTPS connector component side and the negative ETCRTN terminal on the ETBTPS connector component side. The resistance should be 1,800-4,900 ohms.
      14.  
      15. If not within specification, replace the sensor.
      16.  

    26.  
    27. Check the resistance of the type 2 ETBTPS as follows:
      1. Key in OFF position.
        NOTE
        Do not move the throttle plate during the resistance measurement. Measure the sensor resistance with the throttle plate at the default position.

      2.  
      3. ETBTPS connector disconnected.
      4.  
      5. Measure the resistance between the positive TP 1 terminal on the ETBTPS connector component side and the negative ETCREF terminal on the ETBTPS connector component side. The resistance should be 700-1,800 ohms.
      6.  
      7. Measure the resistance between the positive TP 1 terminal on the ETBTPS connector component side and the negative ETCRTN terminal on the ETBTPS connector component side. The resistance should be 1,300-2,800 ohms.
      8.  
      9. Measure the resistance between the positive TP 2 terminal on the ETBTPS connector component side and the negative ETCREF terminal on the ETBTPS connector component side. The resistance should be 1,000-2,400 ohms.
      10.  
      11. Measure the resistance between the positive TP 2 terminal on the ETBTPS connector component side and the negative ETCRTN terminal on the ETBTPS connector component side. The resistance should be 500-1,500 ohms.
      12.  
      13. Measure the resistance between the positive ETCREF terminal on the ETBTPS connector component side and the negative ETCRTN terminal on the ETBTPS connector component side. The resistance should be 700-2,100 ohms.
      14.  
      15. If not within specification, replace the sensor.
      16.  

    28.  
    29. Check the TP1 and TP2 circuits for a short to voltage in the harness as follows:
      1. PCM connector disconnected.
      2.  
      3. Key ON, engine OFF.
      4.  
      5. Measure the voltage between the positive TP1 or TP2 terminal on the ETBTPS connector on the harness side and ground. If voltage is present the there is a short to voltage.
      6.  

    30.  
    31. Check the TP1 and TP2 circuits for an open in the harness as follows:
      1. Key in OFF position.
      2.  
      3. Measure the resistance between the positive TP1 or TP2 terminal on the ETBTPS connector on the harness side and the negative TP 1 or TP2 terminal on the PCM connector on the harness side. If the resistance is not 5 ohms, there is an open circuit.
      4.  

    32.  
    33. Check the tp1 and tp2 circuits for a short to ground in the harness as follows:
      1. Measure the resistance between the positive TP1 or TP2 terminal on the ETBTPS connector on the harness side and the negative battery terminal. If the resistance is not greater that 10 Kohms, there is a short circuit.
      2.  

    34.  
    35. Check the TP circuits for a short together as follows:
      1. Measure the resistance between the following terminals:

        Positive TP1 terminal on the ETBTPS connector on the harness side and the negative TP2 terminal on the PCM connector on the harness side.
         
        Positive TP1 terminal on the ETBTPS connector on the harness side and the negative ETCREF terminal on the PCM connector on the harness side.
         
        Positive TP1 terminal on the ETBTPS connector on the harness side and the negative ETCRTN terminal on the PCM connector on the harness side.
         
        Positive TP2 terminal on the ETBTPS connector on the harness side and the negative ETCREF terminal on the PCM connector on the harness side.
         
        Positive TP2 terminal on the ETBTPS connector on the harness side and the negative ETCRTN terminal on the PCM connector on the harness side.
         

      2.  
      3. If the resistance is not greater that 10 Kohms, there is a short circuit.
      4.  

    36.  
    37. Check the air inlet system for leaks. Repair as needed.
    38.  
    39. Listen for air noise around the Mass Air Flow (MAF) sensor and throttle body while the engine is running. Repair as needed.
    40.  
    41. Check the Throttle Actuator Control Motor (TACM) visually
      NOTE
      Make sure the TACM harness connector is properly connected.

    42.  
    43. Key in OFF position.
    44.  
    45. Inspect the TACM for damaged housing, harness connector, and harness. Repair as needed.

      Click image to see an enlarged view

      Fig. EETBTPS connector terminal locations. Pin 3 is TP1 Pin 4 is the ECTRTN, Pin 5 is ECTREF and Pin 6 TP2



      Click image to see an enlarged view

      Fig. EETBTPS harness connector terminal locations. Pin 2 is Tach + Pin 2 is Tach -, Pin 3 is Throttle position signal 1, Pin 4 is ETC reference voltage, Pin 5 is ETC reference voltage and PIN 6 is Throttle position signal 2

    46.  

     
    AutoZone Logo