Toyota Corolla 1988-1997 Repair Guide

Idle Air Control (IAC) Valve

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TESTING



See Figure 1

  1. Remove the throttle body as described in Fuel System .
  2.  
  3. Remove the IAC valve.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Idle Air Control (IAC) valve wiring schematic

  1. Connect the positive lead from the battery to terminal B+ and the negative lead to terminal RSC. Check that the valve is closed.
  2.  
  3. Connect the positive lead from the battery to terminal B+ and the negative lead to terminal RSO, then check that the valve is open.
  4.  
  5. If the valve is not properly functioning during testing, then replace the valve.
  6.  

REMOVAL & INSTALLATION



See Figure 2

  1. Remove the throttle body as described in Fuel System .
  2.  
  3. Remove the 4 screws retaining the IAC valve and pull the unit from the engine. Discard the old gasket.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: Remove the 4 retaining screws securing the IAC valve

To install:
  1. Place a new gasket into position on the throttle body.
  2.  
  3. Position the IAC valve and secure the retaining screws.
  4.  
  5. Install the throttle body as described in Fuel System .
  6.  

 
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