626 1999-2001

Idle Air Control Valve

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Operation



Specific to:

Mazda 626 1999-2002

The Idle Air Control (IAC) valve controls the engine idle speed and dashpot functions. The valve is located on the side of the throttle body. This valve allows air, determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal, to bypass the throttle plate in order to maintain the proper idle speed.

Removal & Installation



Specific to:

Mazda 626 1999-2002

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the electrical connector at the sensor.
  4.  
  5. Remove the sensor from the throttle body.
  6.  

To install:

  1. Install the sensor in the opening in the throttle body and tighten the sensor.
  2.  
  3. Attach the electrical connector to the sensor.
  4.  
  5. Connect the negative battery cable.
  6.  

Testing



2.0L 4-Cylinder Engine (FS)

Specific to:

Mazda 626 1998-2002

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the IAC valve connector.
  4.  
  5. Measure the resistance between the IAC valve terminal using an ohmmeter. Resistance should be 7.7-9.3 ohms at 73°F (23°C).
  6.  
  7. If not as specified, replace the IAC valve.

    Click image to see an enlarged view

    Fig. Measuring resistance of the IAC valve-2.0L 4-cylinder engines

  8.  

2.5L V6 Engine (KL)

Specific to:

Mazda 626 1998-2002

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the IAC valve connector.
  4.  
  5. Measure the resistance between the IAC valve terminal using an ohmmeter. Resistance should be 8.7-10.5 ohms at 75°F (24°C).
  6.  
  7. If not as specified, replace the IAC valve.

    Click image to see an enlarged view

    Fig. Measuring resistance of the IAC valve-2.5L V6 engines

  8.  

 
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