Boost (BARO) Sensor

The boost sensor measures the changes in the intake manifold pressure. The boost sensor converts engine load and speed changes, then converts the change in readings to voltage output.

The PCM sends a 5 volt reference signal to the boost sensor. As the manifold pressure changes, the electrical resistance of the boost sensor also changes. By monitoring the sensor output voltage, the PCM detects the boost pressure. A high pressure (high voltage) requires more fuel. A lower pressure (low voltage) requires less fuel. The control module uses the boost pressure signal to control fuel delivery.

The boost sensor also is used for BARO readings only on vehicles not equipped with EGR. This sensor reads Barometric Pressure (BARO) under certain conditions, which allows the PCM to automatically adjust for different altitudes.