Century, Grand Prix, Impala, Intrigue, Lumina, Monte Carlo, Regal 2001-2005

Manifold Absolute Pressure Sensor

Print

Removal & Installation



3.1 And 3.4L Engines
  1. Remove the manifold absolute pressure (MAP) sensor screws.
  2.  
  3. Disconnect the MAP sensor electrical connector.
  4.  
  5. Remove the inlet vacuum hose from the map sensor.
  6.  
  7. Remove the MAP sensor from the bracket.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  8.  
  9. To install, reverse removal procedure.

    Click image to see an enlarged view

    Fig. Removing and installing MAP sensor-3.1L and 3.4L

  10.  

3.5L And 3.9L Engines
  1. Remove the intake manifold cover.
  2.  
  3. Disconnect the manifold absolute pressure (MAP) sensor electrical connector.
  4.  
  5. Remove the spark plug wire clip from the intake manifold bracket, if necessary.
  6.  
  7. Remove the upper intake manifold bolts.
  8.  
  9. Remove the MAP sensor and bracket.
  10.  
  11. Remove the MAP sensor seal from the upper intake manifold.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  12.  
  13. To install, reverse removal procedure.
  14.  
  15. Tighten the upper manifold bolts to 18 ft. lbs. (25 Nm).

    Click image to see an enlarged view

    Fig. Removing and installing MAP sensor-3.5L and 3.9L

  16.  

3.8L Engine
With Supercharger
  1. Remove the fuel injector sight shield.
  2.  
  3. Disconnect the MAP sensor electrical connector and the vacuum hose.
  4.  
  5. Remove the manifold absolute pressure (MAP) sensor retainer.
  6.  
  7. Remove the MAP sensor.
  8.  
  9. To install, reverse removal procedure.

    Click image to see an enlarged view

    Fig. Removing and installing MAP sensor, with supercharger-3.8L Engine

  10.  

Without Supercharger
  1. Remove the fuel injector sight shield.
  2.  
  3. Disconnect the MAP sensor electrical connector.
  4.  
  5. Carefully release the locking tabs holding the MAP (1) sensor to the PCV valve cover (2) just enough to remove the MAP sensor.
  6.  
  7. Pull the MAP sensor straight out of PCV valve cover.
  8.  
  9. To install, reverse removal procedure.

    Click image to see an enlarged view

    Fig. Removing and installing MAP sensor, without supercharger-3.8L Engine

  10.  

Testing



Many intermittent open or shorted circuits come and go with harness and connector movement caused by vibration, engine torque, bumps and rough pavement, etc.

  1. Test the wiring harness and connectors by performing the following:

    Move the related connectors and wiring while monitoring the appropriate scan tool data.
     
    Move the related connectors and wiring with the component commanded ON and OFF, with the scan tool. Observe the components operation.
     
    With the engine running, move the related connectors and wiring while monitoring engine operation
     
    If harness or connector movement affects the data displayed, the component and system operation, or the engine operation, inspect and repair the harness or connections as necessary
     

  2.  
  3. Test the electrical connections and/or wiring by performing the following:

    Inspect for incorrect mating of the connector halves, or terminals not fully seated in the connector body, backed-out.
     
    Inspect for improperly formed or damaged terminals. Test for incorrect terminal tension.
     
    Inspect for poor terminal to wire connections including terminals crimped over insulation. This requires removing the terminal from the connector body.
     
    Inspect for corrosion or water intrusion. Pierced or damaged insulation can allow moisture to enter the wiring. The conductor can corrode inside the insulation with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits.
     
    Inspect for wires that are broken inside the insulation.
     

  4.  

 
label.common.footer.alt.autozoneLogo