Toyota Tacoma 2002-06

Idle Air Control Valve

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Testing



2RZ-FE
California Specification
  1. Check that the IAC valve is half open.
  2.  
  3. Connect the IAC valve connector to the IAC valve.
  4.  
  5. Disconnect the ECT sensor connector from the ECT sensor.
  6.  
  7. Turn the ignition switch ON.
  8.  
  9. Check that the IAC valve moves.
  10.  
  11. Repeat connecting and disconnecting of IAC valve connector several times and check the operation of the valve.
  12.  
  13. If operation is not as specified, replace the IAC valve.
  14.  
  15. Turn the ignition switch OFF.
  16.  
  17. Connect the ECT sensor connector to the ECT sensor.

    Click image to see an enlarged view

    Fig. Idle Air Control Valve

  18.  

Except California Specification
  1. Disconnect the IAC valve connector.
  2.  
  3. Using an ohmmeter, measure resistance between terminal +B and the other (RSC, RSO) terminals.
  4.  
  5. If resistance is not as specified, replace the IAC valve.

    Click image to see an enlarged view

    Fig. IAC valve terminal identification



    Click image to see an enlarged view

    Fig. Resistance table

  6.  
  7. Connect the positive (+) lead from the battery to terminal +B and negative (-) to terminal RSC and check that the valve is closed.
  8.  
  9. Connect the positive (+) lead from the battery to terminal +B and negative (-) to terminal RSO and check that the valve is open.

    Click image to see an enlarged view

    Fig. Checking IAC valve operation

  10.  

3RZ-FE
California Specification
  1. Check that the IAC valve is half open.
  2.  
  3. Connect the IAC valve connector to the IAC valve.
  4.  
  5. Disconnect the ECT sensor connector from the ECT sensor.
  6.  
  7. Turn the ignition switch ON.
  8.  
  9. Check that the IAC valve moves.
  10.  
  11. Repeat connecting and disconnecting of IAC valve connector several times and check the operation of the valve.
  12.  
  13. If operation is not as specified, replace the IAC valve.
  14.  
  15. Turn the ignition switch OFF.
  16.  
  17. Connect the ECT sensor connector to the ECT sensor.

    Click image to see an enlarged view

    Fig. Idle Air Control Valve

  18.  

Except California Specification
  1. Disconnect the IAC valve connector.
  2.  
  3. Using an ohmmeter, measure resistance between terminal +B and the other (RSC, RSO) terminals.
  4.  
  5. If resistance is not as specified, replace the IAC valve.

    Click image to see an enlarged view

    Fig. IAC valve terminal identification



    Click image to see an enlarged view

    Fig. Resistance table

  6.  
  7. Connect the positive (+) lead from the battery to terminal +B and negative (-) to terminal RSC and check that the valve is closed.
  8.  
  9. Connect the positive (+) lead from the battery to terminal +B and negative (-) to terminal RSO and check that the valve is open.

    Click image to see an enlarged view

    Fig. Checking IAC valve operation

  10.  

5VZ-FE
  1. Connect the positive (+) lead from the battery to terminal +B and negative (-) lead to terminal RSC, and check that the valve is closed.
  2.  
  3. Connect the positive (+) lead from the battery to terminal +B and negative (-) lead to terminal RSO, and check that the valve is open.
  4.  
  5. If operation is not as specified, replace the IAC valve.

    Click image to see an enlarged view

    Fig. IAC valve testing

  6.  

 
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