Hyundai Coupes/Sedans 1994-1998 Repair Guide

Barometric Pressure (BARO) Sensor

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OPERATION



The BARO sensor is an integral part of the VAF. The sensor signal is used by the ECM to compute the altitude at which the vehicle is running and corrects the ignition timing and air/fuel ratio for best driveability and performance.

TESTING



See Figures 1 and 2



Click image to see an enlarged view

Fig. Fig. 1: BARO sensor schematic



Click image to see an enlarged view

Fig. Fig. 2: Barometric Pressure Sensor Specification Chart

Testing of the BARO sensor requires the use of a scan tool.

  1. Connect the scan tool as per the manufacturers instructions.
  2.  
  3. Note the elevation in feet of the site where the test is being performed.
  4.  
  5. The signal from the barometric pressure sensor should correspond with the actual altitude as per the barometric pressure sensor SPECIFICATION CHARTS.
  6.  
  7. If the sensor is not within specification, check the power and ground circuits.
  8.  
  9. If the power and ground circuits are functional, the sensor is faulty.
  10.  

REMOVAL & INSTALLATION



The BARO sensor is an integral part of the VAF and can not be serviced separately. If the sensor is found to be defective, the VAF must be replaced as an assembly.

 
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