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    1993 Land Rover Defender 110 3.9L MFI 8cyl

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    Chrysler Cirrus/Stratus/Sebring/Avenger/Breeze 1995-1998

    Idle Air Control Motor

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    OPERATION



    See Figure 1

    The Idle Air Control (IAC) motor, attached to the side of the throttle body, is operated by the PCM. The PCM adjusts engine idle speed through the idle air control motor to compensate for load on the engine, or changes in coolant temperature or barometric pressure.



    Click image to see an enlarged view

    Fig. Fig. 1: Location of the TPS (1) and the IAC motor (2) on the throttle body assembly-shown with the air cleaner assembly removed

    The throttle body has an air passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the air bypass passage and regulates the air flow through it. The PCM adjusts the idle speed by moving the IAC motor pintle in and out of the bypass passage. The adjustments are based on various sensor and switch inputs received by the PCM.

    TESTING



    See Figures 2 and 3

    Visually check the connector, making sure it is properly attached, and that all of the terminals are straight, tight and free of corrosion.

    You need to have access to a DRB® or equivalent scan tool to test the Idle Air Control (IAC) motor and related circuits. Make sure to carefully follow all of the scan tool manufacturer's directions when testing the IAC motor. However, a resistance test of the idle air control motor can be performed with the following steps.

    1. Disconnect the negative battery cable. On Cirrus, Stratus, Sebring convertible and Breeze models, disconnect the negative battery cable at the remote location on the left strut tower.
    2.  
    3. Disengage the IAC motor connector.
    4.  



    Click image to see an enlarged view

    Fig. Fig. 2: Measure the resistance between terminals 1 and 4 of the IAC motor connector



    Click image to see an enlarged view

    Fig. Fig. 3: Measure the resistance between terminals 2 and 3 of the IAC motor connector

    1. Using an ohmmeter, measure the resistance between terminals 1 and 4 of the connector at the IAC motor side. Then, measure the resistance between terminals 2 and 3 of the connector at the IAC motor side. Resistance value should measure 38-52 ohms at 68°F (20°C).
    2.  
    3. Replace the IAC motor if the resistance measures outside the standard value.
    4.  

    REMOVAL & INSTALLATION



    See Figures 4 and 5

    You will need to have access to a DRB® or equivalent scan tool when installing the IAC motor, as the IAC motor pintle must be properly retracted if extends more than 1 in. (25mm).

    1. Disconnect the negative battery cable. On Cirrus, Stratus, Sebring convertible and Breeze models, disconnect the negative battery cable at the remote location on the left strut tower.
    2.  
    3. Disconnect the EVAP purge hose from the throttle body.
    4.  
    5. Remove the throttle body from the vehicle, as outlined in Fuel System of this repair guide.
    6.  
    7. Detach the electrical connectors from the IAC motor and Throttle Position (TP) sensor.
    8.  



    Click image to see an enlarged view

    Fig. Fig. 4: Loosen the IAC mounting screws using a Torx® head screwdriver



    Click image to see an enlarged view

    Fig. Fig. 5: Removing the IAC motor from the throttle body assembly

    1. Unfasten the IAC motor mounting screws from the throttle body, then remove the motor from the throttle body. Make sure the O-ring is removed with the motor. Remove and discard the O-ring.
    2.  

    When servicing throttle body components, always install the components with new O-rings and seals, when applicable. Do NOT use any lubricants on the O-rings or seals, as damage may result. If you're having trouble, use a little water to help ease installation.

    To install:
    1. The new IAC motor has a new O-ring installed on it. Measure the pintle on the new IAC valve. If it is longer than 1 in. (25mm), it must be retracted using the Idle Air Control Motor Open/Close test on the DRB® or equivalent scan tool. Note that the battery must be connected for this test.
    2.  
    3. If the old IAC motor is being installed, place a new O-ring on the motor.
    4.  
    5. Carefully plate the IAC motor into the throttle body and install the retaining screws. Tighten the screws to 25 inch lbs. (3 Nm).
    6.  
    7. Attach the electrical connectors to the IAC motor and TP sensor.
    8.  
    9. Install the throttle body. Connect the EVAP purge hose to the throttle body nipple.
    10.  
    11. Connect the negative battery cable.
    12.  

     
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