Toyota Pick-ups/Land Cruiser/4Runner 1989-1996

Throttle Body

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REMOVAL & INSTALLATION



See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine coolant.
  4.  
  5. Tag and disconnect all lines, hoses or wires that lead from the throttle body. On models equipped with an automatic transmission, disconnect the throttle control cable.
  6.  



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Fig. Fig. 1: Exploded view of the throttle body and related components-3RZ-FE shown

  1. Remove the air intake connector and the air cleaner hose with resonator.
  2.  
  3. Unscrew the mounting bolts and remove the throttle body and gasket. The cast metal parts may be cleaned with a soft brush and carburetor solvent. If possible, use low pressure compressed air to blow out the passages and tubing.
  4.  

To install:
  1. Install the throttle body using a new gasket, then tighten the mounting bolts 9-13 ft. lbs. (12-18 Nm).
  2.  
  3. Connect the air cleaner hose with resonator and the air intake connector.
  4.  
  5. Reconnect all lines, hoses and wires.
  6.  
  7. Fill the engine with coolant and connect the battery cable.
  8.  

TESTING & ADJUSTMENT



22R-E Engine

See Figures 2, 3, 4, 5, 6 and 7

  1. With the throttle body off the vehicle, clean prior to inspection. Wash and clean the cast parts with a soft brush in carburetor cleaner. Using compressed air, clean all of the passages and apertures in the throttle body.
  2.  



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Fig. Fig. 2: Using compressed air, clean the passages and apertures of the throttle body

To prevent any damage, do not clean the throttle position sensor.

  1. Check that there is no clearance between the throttle stop screw and the throttle lever when the throttle valve is fully closed.
  2.  



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Fig. Fig. 3: Locations of the throttle lever and stop screw

  1. Check the position sensor.
  2.  
  3. If necessary, adjust the throttle position sensor by loosening the 2 screws of the sensor. Insert a 0.0276 in. (0.70mm) gauge between the throttle stop screw and the lever. Connect the ohmmeter to the terminals IDL and E2 of the sensor.
  4.  



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Fig. Fig. 4: Loosen the throttle positioner screws



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Fig. Fig. 5: Insert a 0.70mm gauge between the throttle stop screw and the lever. Connect the ohmmeter to terminals IDL and E2 of the sensor

  1. Slowly turn the sensor clockwise until the ohmmeter deflects, then secure the sensor with the screws. Using the thickness gauge, recheck the continuity between the two terminals.
  2.  



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Fig. Fig. 6: Slowly turn the sensor clockwise until the ohmmeter deflects



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Fig. Fig. 7: Insert the appropriate gauge to check for proper adjustment

3VZ-E Engine
ON VEHICLE

See Figures 8, 9, 10, 11, 12, 13, 14 and 15

  1. Check the the throttle linkage moves smoothly.
  2.  



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Fig. Fig. 8: Check the smoothness of the throttle linkage

  1. Check the vacuum at each port:
    1. Start the engine.
    2.  
    3. Pull each line off one at a time and check the vacuum with your finger.
    4.  

  2.  



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Fig. Fig. 9: With the engine running, pull each of these vacuum lines off one at a time, then check for vacuum with your finger

  1. Inspect the throttle position sensor by applying vacuum to the throttle opener. Unplug the sensor connection, then insert a 0.0244 in. (0.62mm) gauge or SST 09240-00020, between the throttle stop screw and the stop lever. With the aid of an ohmmeter, measure the resistance between each terminal.
  2.  



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Fig. Fig. 10: As you apply vacuum to the throttle opener, insert a gauge or SST 09240-00020 between the throttle stop and the stop lever



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Fig. Fig. 11: Measure the resistance between each of the terminals on the throttle position sensor

  1. Reconnect the sensor.
  2.  



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Fig. Fig. 12: Insert the appropriate gauge to check for proper adjustment

  1. Inspect the dashpot, warm-up the engine to normal operating temperature.
  2.  



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Fig. Fig. 13: Exploded view of the dashpot assembly

  1. Check the idle speed and adjust, if necessary.
  2.  
  3. Remove the cap, filter and separator from the dashpot.
  4.  



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Fig. Fig. 14: Check and adjust the dashpot setting speed; maintain the engine speed at 2500 rpm or more

  1. Check and adjust the dashpot setting speed:
    1. Maintain engine speed of 2500 rpm or more.
    2.  
    3. Plug the Vacuum Transmitting Valve (VTV) hole with your finger.
    4.  
    5. Release the throttle valve, then check that the dashpot is set to 1800-2200 rpm.
    6.  
    7. If it is not as specified, adjust with the dashpot adjusting screw.
    8.  

  2.  



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Fig. Fig. 15: Within one second, the rpm should drop once your finger is removed from the Vacuum Transmitting Valve (VTV) hole

  1. Check the operation of the Vacuum Transmitting Valve (VTV) by setting the dashpot speed in the same procedure as above:
    1. Maintain engine speed of 2500 rpm or more.
    2.  
    3. Plug the Vacuum Transmitting Valve (VTV) hole with your finger.
    4.  
    5. Release the throttle valve, then check that the dashpot is set to 1800-2200 rpm.
    6.  
    7. Remove your finger from the hole and check that the engine returns to idle speed in approximately 1 second.
    8.  

  2.  
  3. Install the dashpot separator, filter and cap.
  4.  
  5. Inspect the throttle opener by allowing the engine to warm up. Check the idle speed.
  6.  
  7. Check the throttle opener seating speed by disconnecting the vacuum hose from the opener, then plug the hose end.
  8.  
  9. Maintain the idle speed at 2500 rpm.
  10.  
  11. Release the throttle valve, then check that the opener is set, 900-1800 rpm. If the speed is not as specified, replace the throttle body assembly.
  12.  
  13. Reconnect the vacuum hose to the opener.
  14.  
  15. Inspect the air valve operation by fully screwing in the idle speed adjusting screw.
    1. At low temperature, while the screw is in, the engine speed should drop.
    2.  
    3. After warm-up, while the screw is in, the engine speed should drop below idle speed stop.
    4.  

  16.  

OFF VEHICLE
  1. With the throttle body off the vehicle, clean prior to inspection. Wash and clean the cast parts with a soft brush in carburetor cleaner. Using compressed air, clean all of the passages and apertures in the throttle body.
  2.  

To prevent any damage, do not clean the throttle position sensor.

  1. Apply vacuum to the throttle opener.
  2.  
  3. Check that there is no clearance between the throttle stop screw and the throttle lever when the throttle valve is fully closed.
  4.  
  5. Check the position sensor.
  6.  
  7. Apply vacuum to the throttle opener.
  8.  
  9. Insert a gauge between the throttle stop screw and the lever. Connect the ohmmeter to measure the resistance between each terminal.
  10.  
  11. Reconnect the sensor harness.
  12.  
  13. If necessary, adjust the throttle position sensor by loosening the 2 screws of the sensor.
  14.  
  15. Apply vacuum to the throttle opener.
  16.  
  17. Insert a gauge 0.024 in. (0.60mm) between the throttle stop screw and the lever. Connect the ohmmeter to measure the resistance between terminals IDL and E2 of the sensor.
  18.  
  19. Slowly turn the sensor clockwise until the ohmmeter deflects, then secure the sensor with the screws. Using the gauge, recheck the continuity between the two terminals.
  20.  

2RZ-FE and 3RZ-FE Engine

See Figures 16, 17, 18 and 19

  1. With the throttle body off the vehicle, clean prior to inspection. Wash and clean the cast parts with a soft brush in carburetor cleaner. Using compressed air, clean all of the passages and apertures in the throttle body.
  2.  

To prevent any deterioration, do not clean the throttle position sensor.

  1. Apply vacuum to the throttle opener.
  2.  
  3. Check that there is no clearance between the throttle stop screw and the throttle lever when the throttle valve is fully closed.
  4.  



Click image to see an enlarged view

Fig. Fig. 16: When applying vacuum to the throttle opener, ensure that there is no clearance between the throttle stop and throttle lever

  1. Check the position sensor.
  2.  
  3. Apply vacuum to the throttle opener.
  4.  
  5. Insert a gauge between the throttle stop screw and the lever. Connect the ohmmeter to measure the resistance between each terminal.
  6.  



Click image to see an enlarged view

Fig. Fig. 17: With an ohmmeter, measure the resistance between each terminal of the throttle position sensor



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Fig. Fig. 18: Insert the appropriate gauge to check for proper adjustment of the throttle position sensor on the 2RZ-FE and 3RZ-FE engines

  1. Reconnect the sensor harness.
  2.  
  3. If necessary, adjust the throttle position sensor by loosening the 2 screws of the sensor.
  4.  
  5. Apply vacuum to the throttle opener.
  6.  
  7. Insert a gauge 0.026 in. (0.65mm) between the throttle stop screw and the lever. Connect the test probe of the ohmmeter to measure the resistance between terminals IDL and E2 of the sensor.
  8.  
  9. Slowly turn the sensor clockwise until the ohmmeter deflects, then secure the sensor with the screws. Using the gauge, recheck the continuity between the terminals.
  10.  



Click image to see an enlarged view

Fig. Fig. 19: Insert the appropriate gauge to check for proper adjustment of the lever and stop screw

3F-E Engine
ON VEHICLE

See Figures 20, 21, 22 and 23

  1. Check that the throttle linkage moves smoothly.
  2.  



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Fig. Fig. 20: Using your finger, slide the linkage back and forth to check movement

  1. Start the engine and remove the hose(s) one at a time from the vacuum port.
  2.  



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Fig. Fig. 21: The results of the vacuum testing at the EGR and R ports should be as indicated

  1. With your finger, check that there is no vacuum at idle and that there is vacuum at anything other than idle.
  2.  



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Fig. Fig. 22: Attach an ohmmeter to the terminals and check the resistance of the throttle position sensor

  1. Unplug the electrical connector from the throttle position sensor.
  2.  
  3. Insert a flat feeler gauge between the throttle stop screw and the stop lever.
  4.  



Click image to see an enlarged view

Fig. Fig. 23: Clearance and resistance specifications for the 3F-E idle stop and lever

  1. Using an ohmmeter, check the continuity between each terminal on the sensor.
  2.  
  3. Reconnect the sensor harness.
  4.  

OFF VEHICLE
  1. With the throttle body off the vehicle, clean prior to inspection. Wash and clean the cast parts with a soft brush in carburetor cleaner. Using compressed air, clean all of the passages and apertures in the throttle body.
  2.  

To prevent any deterioration, do not clean the throttle position sensor.

  1. Apply vacuum to the throttle opener.
  2.  
  3. Check that there is no clearance between the throttle stop screw and the throttle lever when the throttle valve is fully closed.
  4.  
  5. Check the position sensor.
  6.  
  7. If necessary, adjust the throttle position sensor by loosening the 2 screws of the sensor.
  8.  
  9. Insert a gauge 0.0366 in. (0.93mm) between the throttle stop screw and the lever. Connect the test probe of the ohmmeter to measure the resistance between terminals IDL and E2 of the sensor.
  10.  
  11. Slowly turn the sensor clockwise until the ohmmeter deflects, then secure the sensor with the screws. Using the thickness gauge, recheck the continuity between the two terminals.
  12.  
  13. Inspect the dashpot, warm-up the engine to normal operating temperature.
  14.  
  15. Check the idle speed and adjust, if necessary.
  16.  
  17. Disconnect the ISC harness.
  18.  
  19. Remove the cap, filter and separator from the dashpot.
  20.  
  21. Check and adjust the dashpot setting speed:
    1. Maintain engine speed of 2500 rpm or more.
    2.  
    3. Plug the Vacuum Transmitting Valve (VTV) hole with your finger.
    4.  
    5. Release the throttle valve, then check that the dashpot is set to 1200 rpm.
    6.  
    7. If it is not as specified, adjust with the dashpot adjusting screw.
    8.  

  22.  
  23. Check the operation of the VTV by setting the dashpot speed in the same procedure as above:
    1. Maintain engine speed of 2500 rpm or more.
    2.  
    3. Plug the VTV hole with your finger.
    4.  
    5. Release the throttle valve, then check that the dashpot is set to 1200 rpm.
    6.  
    7. Remove your finger from the hole and check that the engine returns to idle speed in approximately 1 second.
    8.  

  24.  
  25. Install the dashpot separator, filter and cap.
  26.  
  27. Reconnect the ISC harness.
  28.  

 
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