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    2007 Lincoln MKZ 3.5L SFI DOHC 6cyl

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

    Intake Air Temperature Sensor

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    OPERATION



    The Intake Air Temperature (IAT) sensor measures the temperature of the intake air as it enters the engine. The sensor supplies one of the inputs the PCM uses to determine injector pulse width and spark advance. As the intake air temperature varies, the IAT sensor's resistance changes, resulting in a different input voltage to the PCM.

    On all vehicles except 1996-98 models with the 2.0L SOHC engine, the IAT sensor threads into the intake manifold. On 1996-98 vehicles equipped with a 2.0L SOHC engine, the IAT and Manifold Absolute Pressure (MAP) sensors are combined into a single sensor which is attached to the intake manifold.

    TESTING



    Except 1996-98 Vehicles With 2.0L SOHC Engine

    See Figures 1 and 2

    1. Visually check the connector, making sure it is attached properly and all of the terminals are straight, tight and free of corrosion.
    2.  
    3. With the ignition key OFF , detach the wire harness connector from the IAT sensor.
    4.  



    Click image to see an enlarged view

    Fig. Fig. 1: Checking the resistance of the IAT sensor



    Click image to see an enlarged view

    Fig. Fig. 2: Testing the Intake Air Temperature (IAT) sensor. Use a hair dryer to produce a temperature change

    1. Connect a digital ohmmeter (DVOM) to the sensor terminals. The ohmmeter should read as follows:
      1. With the engine and sensor at normal operating temperature, about 200°F, the DVOM should read about 700-1,000 ohms.
      2.  
      3. With the engine and sensor at room temperature, about 70°F, the DVOM should read about 7,000-13,000 ohms.
      4.  

    2.  

    1996-98 Vehicles With 2.0L SOHC Engine

    See Figures 3 and 4

    1. Test the MAP/IAT sensor output voltage at the sensor connector, between terminals A and B.
    2.  
    3. With the ignition ON , but the engine NOT running, the output voltage should be 4-5 volts. The voltage should drop to 1.5-2.1 volts with a hot, neutral idle speed condition. If OK, go to next step. If not OK, go to Step 4.
    4.  



    Click image to see an enlarged view

    Fig. Fig. 3: IAT/MAP sensor schematic



    Click image to see an enlarged view

    Fig. Fig. 4: IAT/MAP sensor connector terminal identification

    1. Test the PCM terminal 37 for the same voltage described in the previous step to check wiring harness condition. Repair as necessary.
    2.  
    3. Test the IAT sensor ground circuit at the sensor connector terminal A and the PCM terminal 43. If OK, go to the next step. If not, repair as necessary.
    4.  
    5. Test the IAT sensor supply voltage between sensor connector terminal C and A with the ignition key ON . The voltage should be about 3.5-4.5 volts. There should also be 3.5-4.5 volts at terminal 61 of the PCM. If OK, replace the MAP/IAT sensor. If not, repair or replace the wire harness as required.
    6.  

    REMOVAL & INSTALLATION



    1995 Vehicles With 2.0L SOHC Engines

    See Figure 5

    1. Disengage the remote negative battery connection located on the left side strut tower.
    2.  
    3. Remove the engine cover.
    4.  



    Click image to see an enlarged view

    Fig. Fig. 5: IAT and MAP sensor location on the 2.0L SOHC engine (1995 models only)

    1. Detach the electrical connector from the sensor.
    2.  
    3. Remove the sensor from the intake manifold.
    4.  

    To install:
    1. Thread the sensor into the intake manifold and tighten to 90 inch lbs. (10 Nm).
    2.  
    3. Attach the electrical connector to the sensor.
    4.  
    5. Install the engine cover.
    6.  
    7. Connect the negative battery cable.
    8.  

    1996-98 Vehicles With 2.0L SOHC Engine

    See Figure 6

    On 1996-98 vehicles equipped with a 2.0L SOHC engine, the IAT and Manifold Absolute Pressure (MAP) sensors are combined into a single sensor, which is attached to the intake manifold.

    1. Disengage the remote negative battery connection located on the left side strut tower.
    2.  
    3. Detach the electrical connector from the MAP/IAT sensor.
    4.  



    Click image to see an enlarged view

    Fig. Fig. 6: MAP/IAT sensor location on the 2.0L SOHC engine

    1. Unfasten the mounting screws, then remove the MAP/IAT sensor from the vehicle.
    2.  

    To install:
    1. Insert the sensor into the intake manifold, but be careful not to damage the sensor's O-ring seal.
    2.  
    3. Tighten the sensor mounting screws to 20 inch lbs. (2 Nm) on a plastic manifold, or 30 inch lbs. (3 Nm) on an aluminum manifold.
    4.  
    5. Attach the sensor electrical connector.
    6.  
    7. Connect the negative battery cable.
    8.  

    Vehicles With 2.4L Engines

    See Figure 7

    1. Disengage the remote negative battery connection located on the left side strut tower.
    2.  
    3. Remove the air cleaner/inlet duct assembly from the intake manifold.
    4.  
    5. Reaching through the intake manifold from the throttle body side, detach the electrical connector from the IAT sensor.
    6.  



    Click image to see an enlarged view

    Fig. Fig. 7: IAT and MAP sensor location on the 2.4L engine

    1. Remove the sensor from the vehicle.
    2.  

    To install:
    1. Install the sensor into the intake manifold. Tighten the sensor to 20 ft. lbs. (28 Nm).
    2.  
    3. Attach the sensor electrical connector.
    4.  
    5. Install the air cleaner/inlet duct assembly to the intake manifold. Make sure the duct doesn't interfere with the spark plug wires.
    6.  
    7. Connect the negative battery cable.
    8.  

    Vehicles With 2.0L DOHC, 2.5L (VIN H) and 2.5L (VIN N) Engines

    See Figures 8, 9, 10 and 11

    1. Disconnect the negative battery cable.
    2.  
    3. Detach the electrical connector from the IAT sensor.
    4.  



    Click image to see an enlarged view

    Fig. Fig. 8: IAT sensor locations on 2.0L DOHC engines



    Click image to see an enlarged view

    Fig. Fig. 9: IAT and MAP sensor locations on 2.5L engines



    Click image to see an enlarged view

    Fig. Fig. 10: Unplug the IAT sensor connector ...



    Click image to see an enlarged view

    Fig. Fig. 11: ... and use an open end wrench to remove the IAT sensor

    1. Remove the sensor from the vehicle.
    2.  

    To install:
    1. Insert the sensor into the intake manifold.
    2.  
    3. Tighten the sensor to 60 inch lbs. (7 Nm) on 2.0L DOHC and 2.5L (VIN N) engines. Tighten the sensor to 20 ft. lbs. (28 Nm) on 2.5L (VIN H) engines.
    4.  
    5. Attach the electrical connector to the sensor.
    6.  
    7. Connect the negative battery cable.
    8.  

     
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