Fault Detection/Management
A BARO signal that is detected out of range high or low causes the powertrain control module (PCM) to ignore the BARO signal and use the manifold absolute pressure (MAP) signal generated at low idle as an indication of the barometric pressure.
CAUTION:
The PCM harness connectors must be properly seated and the connector latch properly attached to eliminate possible driveability concerns or a no start condition. Installing the PCM connectors on an angle may cause an improper connection, misdiagnosis, and damaged components. Install the connector until the lever pivots and seats itself. Apply light pressure to get the connector into position on the PCM and then fully seat the connector.
NOTE:
Visually inspect the harness connectors for corrosion, damage, proper mating, and correct pin tension.