SRX 2004-2005

Barometric Pressure Sensor

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Operation



The Barometric Pressure (BARO) sensor responds to changes in altitude and atmospheric conditions. This gives the Engine Control Module (ECM) an indication of barometric pressure. The ECM uses this information to calculate fuel delivery. The BARO sensor provides a voltage signal to the ECM relative to the atmospheric pressure changes. The ECM monitors the BARO sensor signal for a voltage outside of the normal range.

Removal & Installation



  1. Detach the electrical connection from the BARO sensor.
  2.  
  3. Remove the screws securing the sensor, then remove it from the intake manifold.
  4.  
  5. Installation is the reverse of removal. If reusing the sensor, replace the seal.

    Click image to see an enlarged view

    Fig. BARO sensor mounting

  6.  

Testing



  1. Inspect the atmospheric vent on the ECM case for one of the following conditions:

    Moisture in the vent inlet
     
    Debris in the vent inlet
     

  2.  
  3. If a condition exists, attempt to clean or dry the atmospheric inlet.
  4.  
  5. Start the engine. Observe the DTC information with a scan tool. DTC P2227, P2228, or P2229 should not set. If DTC P2227, P2228, or P2229 sets, replace the ECM.
  6.  

 
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