The barometric pressure sensor and circuitry are located inside of the engine control module (ECM). The ECM uses barometric pressure information in order to compensate for altitude changes. The barometric pressure sensor reading is displayed on a scan tool when the ignition switch is ON and the engine is OFF.

The engine is running.

Input range check indicates that:

Barometric pressure is less than 38 kPa for more than 5 seconds.

OR

Barometric pressure is greater than or equal to 113 kPa for more than 5 seconds.

Barometric pressure varies depending on weather conditions and altitude.

If DTC P1450 cannot be duplicated, the information included in the Freeze Frame data can be useful in determining vehicle operating conditions when the DTC was first set.

The numbers below refer to the step numbers in the Diagnostic Table.

1. The Powertrain (OBD) System Check prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.

2. This step determines if fault is present.