CTS 2006-2007, CTS-V 2005-2007, DTS 2006-2007

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 BARO. The ECM uses this information to calculate fuel delivery. The BARO sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The ECM supplies 5 volts to the BARO sensor on a 5-volt reference circuit, and provides a ground on a low reference circuit. The BARO sensor provides a voltage signal to the ECM on a signal circuit relative to the atmospheric pressure changes. The ECM monitors the BARO sensor signal for a voltage outside of the normal range. If the ECM detects the actual BARO sensor signal is not within a predetermined range of the calculated BARO sensor value, this DTC sets.

Removal & Installation



2.8L & 3.6L Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Turn the ignition OFF.
  4.  
  5. Disconnect the Barometric Pressure (BARO) sensor electrical connector.
  6.  
  7. Remove the BARO sensor bolt.
  8.  
  9. Remove the BARO sensor.
  10.  

To install:

  1. Install the BARO sensor.
  2.  
  3. Install the BARO sensor bolt. Tighten the bolt to 89 inch lbs. (10 Nm).
  4.  
  5. Connect the BARO sensor electrical connector.
  6.  

Testing



2.8L & 3.6L Engines
  1. Disconnect the Barometric Pressure (BARO) sensor.
  2.  
  3. Turn ON the ignition, with the engine OFF.
  4.  
  5. Check harness connector pin (1) for voltage reference.
  6.  
  7. The voltage reading should be between 4.8-5.2.
  8.  
  9. If the voltage reading is not as stated, check for an open circuit.

    Click image to see an enlarged view

    Fig. Barometric Pressure (BARO) sensor electrical connector

  10.  

 
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