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    2007 Pontiac Grand Prix 3.8L SFI OHV 6cyl

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    E-Series Vans 2008-2009

    Manifold Absolute Pressure Sensor

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    Operation



    Specific to:

    Ford E-350 Super Duty 2008-2009

    The analog Manifold Absolute Pressure (MAP) sensor is a variable capacitor sensor that is supplied a 5-volt reference signal by the PCM and returns a voltage signal to the PCM relative to intake manifold pressure. The sensor voltage increases as pressure increases. The MAP sensor allows the PCM to determine engine load to calculate fuel quantity. In addition, the MAP signal is used to control smoke by limiting fuel quantity during acceleration until a specified boost pressure is obtained.

    Removal & Installation



    6.0L Engine
    1. Move the ignition switch to the OFF position.
    2.  
    3. Disconnect the pressure hose.
    4.  
    5. Disconnect the Manifold Absolute Pressure (MAP) sensor electrical connector.
    6.  
    7. Remove the mounting screws and remove the MAP sensor.

      Click image to see an enlarged view

      Fig. Disconnect the MAP sensor electrical connector before removing the MAP sensor-6.0L Engines

    8.  
    9. Installation is the reverse order of removal.
    10.  

    Testing



    Specific to:

    Ford E-350 Super Duty 2008-2009

    Inspect the air cleaner and inlet duct. Check all engine vacuum hoses for damage, leaks, cracks, kinks and proper routing. Check Electronic Control (EC) system wiring harness for proper connections, bent or broken pins, corrosion, loose wires and proper routing. Check the powertrain control module (PCM), sensors, and actuators for physical damage.

    Basic circuit checks help to minimize pinpoint test steps by providing a procedure to diagnose harness faults associated with the Electronic Engine Control (EC) System:



    Open Circuit (Continuity): Disconnect PCM. Measure the harness resistance between the suspect circuit at the harness connector and the appropriate PCM harness connector pin or PCM breakout box (if available). The resistance must be less than 5.0 ohms.
     
    Shorts to Ground: Measure the harness resistance between the suspect circuit at the harness connector and a reliable ground (B-, chassis gnd or PWR GND at the PCM breakout box, if available). The resistance must be greater than 10,000 ohms.
     
    Shorts to Power: Key ON to power up circuit. Measure voltage between the suspect circuit at the harness connector and a reliable ground. The voltage must be less than 1.0 volt.
     

    1. Disconnect all the PCM connectors. Visually inspect for:

      Pushed out pins
       
      Corrosion
       

    2.  
    3. Connect all the PCM connectors and make sure they seat correctly.
    4.  
    5. Carry out the PCM self-test and verify the error is still present.
    6.  

     
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