Barometric Pressure Sensor: Testing and Inspection

A scan tool displays Exhaust Gas Recirculation (EGR) pressure in volts. Low pressure (high vacuum) reads a low voltage while a high pressure (low vacuum) reads a high voltage. A failure in the EGR control pressure/Barometric Absolute Pressure (BARO) sensor circuit should set a Diagnostic Trouble Code (DTC) 31 or 33 and using the chart will find the cause of the problem. Any other failure in the EGR system should set a DTC 32, 44 or 45. On vehicles using only a BARO sensor a failure in the sensor circuit should set a DTC 31 or 33. Refer to Diagnostic Trouble Code Charts/Diagnostic Charts. Testing and Inspection Also refer to EGR Control Pressure/BARO Sensor Output Check.