Toyota Tercel 1984-1994 Repair Guide

Throttle Body

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REMOVAL & INSTALLATION



See Figures 1 and 2

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the cooling system to a level below the throttle body.
  4.  
  5. Remove the intake duct assembly.
  6.  
  7. Unplug the electrical connectors from the throttle body.
  8.  
  9. Disconnect the accelerator cable.
  10.  
  11. If so equipped, disconnect the transaxle shift cable (automatic transmission) and/or the cruise control cable.
  12.  
  13. Label and unplug the vacuum hoses to the throttle body.
  14.  
  15. Label and disconnect the coolant hoses from the throttle body.
  16.  
  17. Remove the nuts/bolts securing the throttle body, then carefully remove the throttle body.
  18.  

To install:
  1. When reinstalling, always use a new gasket between the throttle body and the intake. Do not use sealants of any kind on the gasket. Place the throttle body in position, then install the nuts/bolts and tighten them to 9 ft. lbs. (13 Nm). Make certain that the throttle body is properly positioned with a new gasket before tightening; no air leaks are acceptable.
  2.  
  3. Connect the accelerator cable.
  4.  
  5. If so equipped, reattach the transaxle cable and/or the cruise control cable.
  6.  
  7. Connect the vacuum and coolant hoses to the throttle body.
  8.  
  9. Engage the electrical connectors to the throttle body. Install the intake duct assembly.
  10.  
  11. Fill the cooling system.
  12.  
  13. Connect the negative battery cable.
  14.  



Click image to see an enlarged view

Fig. Fig. 1: An extension is helpful when removing the throttle body attaching nuts/bolts



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Fig. Fig. 2: Always use a new gasket when installing the throttle body

ADJUSTMENTS



See Figures 3 and 4

Throttle Position Sensor

Adjustment should only be performed if the sensor has been replaced, or if the testing procedure in Emission Controls indicates the need for adjustment.

  1. Loosen the screws securing the sensor.
  2.  
  3. On California models equipped with a throttle opener diaphragm on the throttle body, apply vacuum to it.
  4.  
  5. On 1990 models, insert a 0.0276 in. (0.70 mm) thickness gauge between the throttle stop screw and lever. On 1991 and later models, insert a 0.024 in. (0.60 mm) thickness gauge between the throttle stop screw and lever.
  6.  
  7. Connect the probes of an ohmmeter to terminals IDL and E2 of the sensor.
  8.  
  9. Gradually turn the sensor clockwise until the ohmmeter deflects, then tighten the screws.
  10.  
  11. Insert the following thickness gauges between the throttle stop screw and lever, then check the continuity between terminals IDL and E2 of the sensor.
    1. 1990 models-0.0236 in (0.60 mm) thickness gauge, continuity
    2.  
    3. 1990 models-0.0315 in. (0.80 mm) thickness gauge, no continuity
    4.  
    5. 1991-1994 models-0.020 in. (0.50 mm) thickness gauge, continuity
    6.  
    7. 1991-1994 models-0.028 in. (0.70 mm) thickness gauge, no continuity
    8.  

  12.  
  13. If the sensor did not perform as indicated, readjust the sensor.
  14.  



Click image to see an enlarged view

Fig. Fig. 3: Throttle position sensor terminal identification on 1990 fuel injected models



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Fig. Fig. 4: Throttle position sensor terminal identification on 1991-1994 models

Idle Speed

Follow the procedure outlined in Engine Performance & Tune-Up for idle speed adjustment.

 
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