AutoZone 2007 Honda Truck Odyssey 3.5L MFI SOHC VTEC 6cyl | Repair Guides | Engine Performance & Emission Controls | Components & Systems | Idle Air Control Valve | AutoZone.com

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    BMW Cars 1999-06

    Idle Air Control Valve

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    Operation




    NOTE
    This valve may also be referred to as the idle speed control valve on some models.

    The Idle Air Control (IAC) valve operation is controlled by the Engine Control Module (ECM) to maintain a consistent idle speed during engine warm up and when consumers such as the air conditioner are activated. Essentially, the IAC is a controlled air bleed, maintaining the idle speed by bypassing varying amounts of air around the closed throttle valve. The engine's idle speed is not adjustable.

    Removal & Installation



    M20 Engine
    1. The Idle Air Control (IAC) valve is mounted on the air intake hose near the throttle body.
    2.  
    3. Turn the ignition switch to the OFF position.
    4.  
    5. Disconnect the electrical plug from the back of the valve.
    6.  
    7. Remove the strap from around the valve body.
    8.  
    9. Pull the valve from the connection hose and the intake duct.
    10.  
    11. Installation is the reverse of the removal procedure.
    12.  

    M42 Engine

    On E30 models, the Idle Air Control (IAC) valve is mounted on the intake manifold attached by a bracket. On E36 models the IAC valve is mounted on the intake manifold attached by a strap.

    1. Turn the ignition switch to the OFF position.
    2.  
    3. Disconnect the electrical plug from the back of the valve.
    4.  
    5. On E30 models:
      1. Remove the nuts holding the valve bracket.
      2.  

    6.  
    7. Pull the valve from the connection hoses.
    8.  
    9. On E36 models:
      1. Pull the valve out with the rubber holder.
      2.  
      3. Pull the valve from the connection hoses.
      4.  

    10.  
    11. Installation is the reverse of the removal procedure.
    12.  



    Click image to see an enlarged view

    Fig. Idle speed control valve mounting-M42 engine

    M44 Engine
    1. Turn the ignition switch to the OFF position.
    2.  
    3. Detach the IAC valve electrical connector.
    4.  
    5. Remove the two mounting fasteners.
    6.  
    7. Carefully remove the valve, taking care to not lose the O-ring.
    8.  
    9. Installation is the reverse of the removal procedure.
    10.  



    Click image to see an enlarged view

    Fig. The Idle Air Control (IAC) valve is mounted to the throttle housing on M44 engines

    M50 Engine
    1. The idle speed control valve is mounted under the intake manifold.
    2.  
    3. Turn the ignition switch to the OFF position.
    4.  
    5. Remove the air intake duct from the intake manifold and disconnect the hoses.
    6.  
    7. Disconnect the electrical plug from the back of the valve.
    8.  
    9. Disconnect the coolant hose and move out of the way. Disconnect the hoses from the valve.
    10.  
    11. Disconnect the vacuum hose and pull the valve from the retainer.
    12.  
    13. Installation is the reverse of the removal procedure.
    14.  



    Click image to see an enlarged view

    Fig. Idle speed control valve mounting-M50 engine

    S14 Engines

    The idle speed control valve is mounted below the intake manifold.

    1. Turn the ignition switch to the OFF position.
    2.  
    3. Remove the intake manifold up to the point of the throttle bodies. It is not necessary to remove the throttle bodies.
    4.  
    5. Disconnect the electrical plug from the valve.
    6.  
    7. Loosen the hose clamps at the valve and remove the valve.
    8.  
    9. Installation is the reverse of the removal procedure.
    10.  

    Testing



    Use a BMW service tester, the OBD I blink code or on OBD II vehicles, use a suitable Data Scan Tool (DST) to check for faults and/or if capable, to read the values of the components. If this diagnostic equipment is not available, proceed as follows.

    The Idle Air Control (IAC) valve can be checked with diagnostic equipment such as a duty cycle meter or dwell meter.

    1. Follow the manufacturer's instructions and connect the tester to the valve.
    2.  
    3. Start the engine and activate the air conditioner or another electrical consumer such as the rear window defogger or head lights.
    4.  
    5. Monitor the tester's reading which should vary depending on load, however the idle speed should remain steady.
    6.  

    To check the IAC valve with a digital ohmmeter proceed as follows:

    1. Turn the ignition key to the OFF position and detach the valve's electrical connector.
    2.  
    3. Using a digital ohmmeter, check the resistance between terminals 1 and 2, 2 and 3 and 1 and 3. The resistance should be:

      Terminals 1 and 2: 15-25 ohms
       
      Terminals 2 and 3: 15-25 ohms
       
      Terminals 1 and 3: 35-35 ohms
       

    4.  



    Click image to see an enlarged view

    Fig. IAC valve terminal number identification

     
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