Circuit/System Description

WARNING: This page is about a different variant/trim than selected.

The barometric pressure (BARO) sensor measures the pressure of the atmosphere. This pressure is affected by altitude and weather conditions. A diaphragm within the BARO sensor is displaced by the pressure changes that occur from varying altitudes and weather conditions. The sensor translates this diaphragm displacement into the voltage signal input that is used by the engine control module (ECM) for diagnostics and emissions control.

The supercharger inlet pressure sensor measures the absolute pressure of the air just after the throttle body, at the inlet of the supercharger. The plenum volume between the throttle body and the supercharger is where this sensor is located, and for the purpose of this diagnostic, this area is considered to be the intake manifold. The diaphragm within the supercharger inlet pressure sensor functions in the same manner as the BARO sensor. The sensors are not interchangeable.

The purpose of this diagnostic is to analyze the correlation between the BARO sensor and the supercharger inlet pressure sensor. This is accomplished by continually comparing the difference between BARO and supercharger inlet pressure at key ON, engine OFF, closed throttle idle conditions and at wide open throttle update events. At key ON, engine OFF, the difference between BARO and the supercharger inlet pressure should be very close to zero, and is represented on the scan tool by the Supercharger Inlet Pressure parameter. A negative Supercharger Inlet Pressure parameter means that the BARO sensor value is less than the supercharger inlet pressure value. A positive Supercharger Inlet Pressure parameter represents a BARO sensor value that is greater than the supercharger inlet pressure value.

At idle the Supercharger Inlet Pressure parameter should be a positive value and represents the calculated difference between BARO and the reduced pressure that is present in the supercharger intake plenum. At wide open throttle the Supercharger Inlet Pressure parameter should be very close to zero and represents the calculated difference between BARO and the increased pressure that is present in the supercharger intake plenum.

If the ECM detects that the BARO sensor signal and the supercharger inlet pressure sensor signal are not within a calibrated range, DTC P006D sets.