AutoZone 1989 GMC Truck V1500 1/2ton Sub 4WD 5.7L TBI 8cyl | Repair Guides | Engine Performance & Emission Controls | Components & Systems | Throttle Position Sensor | AutoZone.com

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    1989 GMC Truck V1500 1/2ton Sub 4WD 5.7L TBI 8cyl

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    Toyota Celica, Corolla, ECHO & MR2 1999-05

    Throttle Position Sensor

    Print

    1. Disconnect the TPS connector.
    2.  
    3. Using an ohmmeter, measure the resistance between each terminal.
    4.  
    5. If the resistance is not as specified, replace the TPS.

      Click image to see an enlarged view

      Fig. TPS terminal identification



      Click image to see an enlarged view

      Fig. Resistance table

    6.  

    1. Disconnect the TPS connector.
    2.  
    3. Using an ohmmeter, measure the resistance between each terminal.
    4.  
    5. If the resistance is not as specified, replace the TPS.

      Click image to see an enlarged view

      Fig. TPS terminal identification



      Click image to see an enlarged view

      Fig. Resistance table

    6.  

    Operation



    To reduce HC and CO emissions, the Throttle Position (TP) sensor opens the throttle valve to slightly more than the idle position when decelerating. This keeps the air/fuel ratio from becoming excessively rich when the throttle valve is quickly closed. In addition, the TP is used to increase idle rpm when power steering fluid pressure exceeds a calibrated value and/or when a large electrical load is placed on the electrical system (headlights, rear defogger etc).

    Removal & Installation



    1. Disconnect the harness from the throttle position sensor.
    2.  
    3. Remove the mounting screws and extract the sensor.
    4.  



    Click image to see an enlarged view

    Fig. Remove these two screws that attach the throttle position sensor to the throttle body

    To install:

    1. Make certain the throttle plate is fully closed. With the throttle body held in its normal orientation, place the sensor onto the throttle body so that the electrical connector is in the correct position.
    2.  
    3. Turn the sensor clockwise as shown and temporarily install the retaining screws.
    4.  
    5. Adjust the throttle position sensor.
    6.  

    Testing



    1.8L (1ZZ-FE) VIN R
    1. Disconnect the TPS connector.
    2.  
    3. Using an ohmmeter, measure the resistance between each terminal.
    4.  
    5. If the resistance is not as specified, replace the TPS.

      Click image to see an enlarged view

      Fig. TPS terminal identification



      Click image to see an enlarged view

      Fig. Resistance table

    6.  

    1.8L (2ZZ-FE) VIN Y
    1. Disconnect the TPS connector.
    2.  
    3. Using an ohmmeter, measure the resistance between each terminal.
    4.  
    5. If the resistance is not as specified, replace the TPS.

      Click image to see an enlarged view

      Fig. TPS terminal identification



      Click image to see an enlarged view

      Fig. Resistance table

    6.  

    2.2L (5S-FE) VIN G
    1. Apply vacuum to the throttle opener.
    2.  
    3. Using an ohmmeter, measure the resistance between each terminal.

      Click image to see an enlarged view

      Fig. TPS testing



      Click image to see an enlarged view

      Fig. Resistance table

    4.  
    5. If necessary, adjust the TPS as follows:
      1. Loosen the 2 set screws of the sensor.
      2.  
      3. Insert a 0.60 mm (0.024 in.) feeler gauge between the throttle stop screw and stop lever.
      4.  
      5. Connect the tester probe of an ohmmeter to the terminals IDL and E2 of the sensor.
      6.  
      7. Gradually turn the sensor clockwise until the ohmmeter deflects, and secure it with the 2 set screws.
      8.  

    6.  
    7. Recheck the continuity between terminals IDL and E2.

      Click image to see an enlarged view

      Fig. TPS adjustment



      Click image to see an enlarged view

      Fig. Resistance table

    8.  

    7A-FE Engine
    1. Disconnect the throttle position sensor wiring.
    2.  



    Click image to see an enlarged view

    Fig. Disengage the throttle position sensor harness

    1. Disconnect the throttle opener vacuum hose from the throttle body.
    2.  
    3. Apply vacuum to the throttle opener.
    4.  



    Click image to see an enlarged view

    Fig. Apply vacuum to the throttle opener

    1. Insert a feeler gauge between the throttle stop screw and stop lever.
    2.  



    Click image to see an enlarged view

    Fig. Insert a feeler gauge between the throttle stop screw and stop lever



    Click image to see an enlarged view

    Fig. When using this size gauge to test the IDL and E2 terminals of the TPS sensor, infinity is the result of the testing

    1. Using an ohmmeter, measure the resistance between each terminal.
    2.  



    Click image to see an enlarged view

    Fig. Throttle position sensor terminal identification-7A-FE engine



    Click image to see an enlarged view

    Fig. Testing the terminals of the TP sensor for resistance

    1. If necessary, adjust the throttle position sensor.
      1. Loosen the two set-screws of the sensor.
      2.  
      3. Apply vacuum to the throttle opener.
      4.  
      5. Insert a 0.028 inch (0.70mm) feeler gage between the throttle stop screw and stop lever.
      6.  
      7. Connect the test probe of the ohmmeter to the terminals IDL and E2 of the throttle position sensor.
      8.  
      9. Gradually turn the sensor clockwise until the ohmmeter deflects, and secure it with the set screws.
      10.  
      11. Recheck the continuity between terminals IDL and E2 .
      12.  

    2.  
    3. Reattach the throttle opener vacuum hose to the throttle body.
    4.  
    5. Reconnect the throttle position sensor wiring.
    6.  



    Click image to see an enlarged view

    Fig. Continuity chart between terminals IDL and E2 - 7A-FE engine

     
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